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RTD
4-20mA
R Load
4-20mA
R Load
+ -
+ -
+ -
Resistance
4-Wire
RTD
(Kelvin)
OUT+
OUT-
RTN
IN+
EXC+
IN-
OUT+
OUT-其他 Laser Components    FP-64/2LF-O40-24V    激光器
RTN
IN+
EXC+
IN-
4-20mA
R Load
4-20mA
R Load
+ -
+ -
Isolated Transmitters: 600T Series
248-295-0880 ■  ■  ■  ■ 30765 S Wixom Rd, Wixom, 

MI 48393 USA
– 13 –
671T, 672T, 674T Multi-Channel, Two-Wire Isolators
DC current input ◆ Single, dual, or quad I/O loop-powered 

isolators
Description
Models
671T: Single I/O channel
672T: Dual I/O channel
674T: Quad I/O channel
These units receive 4-20mA process current
inputs and provide isolated 4-20mA output
signals . Each channel operates independently
and is isolated from the others to prevent inter-
action between channels .
For easy troubleshooting, each unit has LEDs
and diagnostic test points . Fault LEDs identify
output open loop conditions and load compli-
ance problems . The precision 10 ohm sense
resistor enables monitoring of the output signal
without disturbing field wiring .
Input / Output Ranges
4 to 20mA DC input
4 to 20mA DC output
Power Requirement
Loop-powered
(power derived from input signal current)
Approvals
CE marked . UL, cUL listed .
Class I; Division 2; Groups A, B, C, D
Key Features & Benefits
■ Multiple channels on a single unit
saves space and reduces costs .
■ Galvanicc isolation eliminates ground loops,
reduces noise, and blocks transient signals .
■ Independent channels prevent signal interac-
tion and offer spares for later use .
■ Fault LEDs provide a clear visual warning of
open or failed process loops .
■ Single calibration pot per channel
enables one-step, precise calibration .
OUT OUT
PLC / DCS
IN
–
+
R L
4-20mA
+
–
+
–
671T
Single channel shown. Quad channel units are available.
4-20mA
Field
Device
670T Series Isolation Diagram
Note: 670T series transmitters are for output resistive 

loads only (sources current).
For application notes using 670T Transmitters, refer to 

Page 16.
OUT
PLC / DCS
IN
+
– –
+
R L
4-20mA
24V DC
4-20mA
4-20mA Source
651T
+
–
Field
Device
–
+
Single channel shown. Dual channel units are available.
650T Series Isolation Diagram
Acromag
DIN EN 50022, 35mm
"T" RAIL DIN MOUNTING
(59.4)
2.34
C
L
(95.3)
3.75
FAULT
CAL
R
1.05
(26.7)
NOTE: ALL DIMENSION ARE IN INCHES (MILLIMETERS)
(118.9)
4.68
(99.1)
3.90
4.35
(110.5)
CHAN 1
FAULT
CAL
CHAN 2
FAULT
CAL
CHAN 3
FAULT
CAL
CHAN 4
46 45 44
CH4 OUT
SNS
OUT+
OUT-
TB4
43 42 41
IN+
IN-
CH4 IN
36 35 34
CH3 OUT
SNS
OUT+
OUT-
TB3
33 32 31
IN+
IN-
CH3 IN
CH1 IN CH1 OUT
IN-
IN+
OUT-
OUT+
SNS
11 12 13 14 15 16
TB1
CH2 IN CH2 OUT
IN-
IN+
OUT-
OUT+
SNS
21 22 23 24 25 26
TB2
Isolated Transmitters: 600T Series
248-295-0880 ■  ■  ■  ■ 30765 S Wixom Rd, Wixom, 

MI 48393 USA
– 14 –
Performance Specifications
Reference Test Conditions
Input/Output current: 4 to 20mA; output load 250
ohms; 77°F (25°C) .
Input
4 to 20mA input (each channel) .
Input burden
The voltage drop is a function of the input current and
load resistance and is calculated as follows:
Input Voltage Drop = 4 .9V DC + (0 .0212A x Rload)
Example:
For Rload = 250 ohms, Vdrop = 10 .2V DC
Output
4-20mA DC output (each channel) .
Output load
0 to 525 ohms .
Accuracy
Better than ±0 .1% of output span . Error includes the
combined effects of isolator repeatability, hysteresis,
terminal point linearity and adjustment resolution .
Calibration
One 15-turn potentiometer per channel
accessible from front of the unit .
Ambient temperature effect
Less than ±0 .01% of output span per °F (±0 .018%
per °C) over the ambient temperature range for refer-
ence test conditions . This specification includes the
combined effects of zero and span over temperature .
Output ripple
Less than ±0 .1% of the maximum output span .
Bandwidth
-3dB at 2 .2Hz, typical .
Response time
For a step input, the output reaches 98% of output
span in less than 300mS, typical, into 250 ohms .
Noise rejection
Common mode: 110dB at 60Hz, typical .
Diagnostics
LED fault indicator: Lights for output open loop detec-
tion or load compliance problem .
Field test points: An internal 10 ohm sense resistor
provides test points for monitoring the output signal
current during field maintenance with a voltmeter .
◆ Environmental
Ambient Temperature
Operating: -25 to 70°C (-13 to 158°F) .
Storage: -40 to 85°C (-40 to 185°F) .
Relative Humidity
5 to 95% .
Power Requirement
Power is derived from the input signal loop . In the
event of an open output circuit, the input loop volt-
age drop is limited below 20V, nominal . Isolator has
reverse polarity protection .
Isolation
Inputs, outputs, and individual channels are
isolated from each other for common-mode
voltages up to 250V AC, or 354V DC off ground, on
a continuous basis (will withstand 1500V AC dielectric
strength test for one minute without breakdown) .
Radiated Field Immunity (RFI)
Designed to comply with EN61000-4-3 Level 3
(10V/m, 80 to 1000MHz AM and 900MHz keyed)
and European Norm EN50082-1 .
Electromagnetic Field Immunity (EMI)
Less than ±0 .25% of output span effect under the
influence of electromagnetic fields from switching
solenoids, commutator motors, and drill motors .
Electrical Fast Transient (EFT)
Complies with EN61000-4-4 Level 3 (2KV) and
European Norm EN50082-1 .
Surge Immunity
Complies with EN61000-4-5 Level 3 (2KV) and
European Norm EN50082-1 .
Electrostatic Discharge (ESD)
Complies with EN61000-4-2 Level 3 (8KV air, 4KV
direct to the enclosure port) and European Norm
EN50082-1 .
Radiated Emissions
Meets or exceeds European Norm EN50081-1 for Class
B equipment .
Approvals
CE marked, UL & cUL listed .
Hazardous Locations: Class I: Div . 2; Groups A, B, C, D .
◆ Physical
Enclosure
Case: Self-extinguishing NYLON type 6 .6 polyamide
thermoplastic UL94 V-2 NEMA Type 1 enclosure .
Connectors (Removable Terminal Blocks)
Wire Range: AWG #14-22 (AWG #12 stranded only) .
Printed Circuit Boards
Military grade FR-4 epoxy glass circuit board .
Dimensions
1 .05W x 4 .68H x 4 .35D inches .
26 .7W x 118 .9H x 110 .5D millimeters .
Shipping Weight
1 pound (0 .45 Kg) packed .
Ordering Information
◆ Models
671T-0600
Single channel isolated transmitter
672T-0600
Dual channel isolated transmitter
674T-0600
Quad channel isolated transmitter
◆ Accessories (see Page 21)
PS5R-SD24
Power supply (24V DC, 2 .5A) .
TBK-B01
Optional terminal block kit, barrier strip style, 2 pcs .
(For use with 671T and 672T model .s)
TBK-B02
Optional terminal block kit, barrier strip style, 4 pcs .
(For use with 674T model .)
TBK-S01
Optional terminal block kit, spring clamp style, 2 pcs .
(For use with 671T and 672T model .s)
TBK-S02
Optional terminal block kit, spring clamp style, 4 pcs .
(For use with 674T model .)
DIN RAIL 3.0
DIN RAIL 16.7
DIN rail strip, Type T, 3 inches (75mm) or
16 .7 inches (425mm)
20RM-16-DIN
19” rack-mount kit with DIN rail .
Holds sixteen 670T transmitters .
Isolated Transmitters: 600T Series
248-295-0880 ■  ■  ■  ■ 30765 S Wixom Rd, Wixom, 

MI 48393 USA
– 15 –
Application Notes
Isolated Transmitters: 600T Series
248-295-0880 ■  ■  ■  ■ 30765 S Wixom Rd, Wixom, 

MI 48393 USA
– 16 –
Application 1
Retransmitting a signal from a two-wire loop to a
second location.
Solution
Use either a model 651T-0600 (single channel) or
652T-0600 (dual channel) transmitter.
Process Measurement
* Pressure
* Flow
* Level
* Temperature
* Speed
24 V DC
DCS/PLC/Controller
Location #1
Input
Output
100.0%
Display
+ - + -
- + - +
2-wire
transmitter
4-20mA
2nd channel on
652T-0600 only
24 V DC
Chart Recorder/DCS/PLC
Location #2
651T-0600
P
+
P
+
±
Notes:
1. Isolator input load = 75 ohms maximum (1.5V DC drop).
2. Input loop is unaffected by faults in output loop.
3. Series 652T provides spare channel.
+
-
(existing field loop)
(re-transmitted loop) 4-20mA
Application 2
Splitting a signal from a two-wire loop:
two outputs for different locations.
Solution
Use either a 653T-0600 (single input, dual output)
or 652T-0600 (dual input, dual output) unit.
2-wire
transmitter
24 V DC
DCS/PLC/Controller
Location #1
24 V DC
Chart Recorder
Location #2
24 V DC
Data Acquisition/RTU
Location #3
-
+
-
+
+
-
+
-
Input Output
652T-0600 performs
same function by adding
an external jumper to
series inputs as shown.
Process Measurement
* Pressure
* Flow
* Level
* Temperature
* Speed
±
653T-0600
P
+
P
+
P
+
Notes:
1. Input isolator load = 150 ohms maximum
(3V DC drop).
2. Input loop is unaffected by faults
in either output loop.
+
-
(existing field loop)
(re-transmitted loop)
4-20mA
4-20mA
(re-transmitted loop) 4-20mA
Application Notes
Isolated Transmitters: 600T Series
248-295-0880 ■  ■  ■  ■ 30765 S Wixom Rd, Wixom, 

MI 48393 USA
– 17 –
Application 3
Retransmitting a signal output from a controller
or a D/A card.
Solution
Use either a model 671T-0600 (single channel) or
672T-0600 (dual channel) transmitter.
Analog inputs
Controller/PLC/DCS
Input
A/D D/A
4-20mA out
- + - +
- + - + Output
+
-
4-20mA
50 ohms
Chart recorder
Valve
671T-0600
2nd channel on
672T-0600 only
Notes:
1. Isolator input load equation:
Input ohms @20mA = 250 ohms + output resistance (ohms).
2. Isolator input voltage drop for this application is 6V 

DC (300 ohms @ 20mA).
3. Series 672T provides spare channel.
+
-
(re-transmitted loop)
(existing field loop)
Application 4
Low-cost, channel-to-channel isolation of
4-20mA signals for controllers.
Solution
Use either a 652T-0600 (dual channel) for A/D
cards or a 674T-0600 (quad channel) for D/A cards.
A/D
D/A
DCS/PLC/Data Acquisition/RTU
± ±
± ±
± ±
± ±
± ±
± ±
± ±
± ±
Sensor 1
Sensor 2
Sensor 3
Sensor 4
Valve 1
Valve 2
Display
System #2
4-20mA signals going
out to the field
Sourced 4-20mA signals
coming in from the field.
If sensors are loop-powered,
an external power supply is
required. See Model PS5R-SB24.
24V DC
24V DC
24V DC
24V DC
±
±
±
±
Output
Input
Input
Output
652T-0600
(qty. 2)
674T-0600
(qty. 1)
Analog Inputs (AI)
Analog Outputs
4-20mA
Notes:
1. Three modules require only 3" of panel space!
2. High density = high value:
Two AI's per inch of panel space!
Four AO's per inch of panel space!
Wired for Loop
Powered Inputs
+
+
+
+
(AO)
4-20mA
600T Application Notes
Isolated Transmitters: 600T Series
248-295-0880 ■  ■  ■  ■ 30765 S Wixom Rd, Wixom, 

MI 48393 USA
– 18 –
Application 5
Powering field transmitters (2-wire) and
providing low-cost isolation of 4-20mA signals for
controllers.
Solution
Model 652T-0600
Model 674T-0600
Model PS5R-SB24
A/D
D/A
DCS/PLC/Data Acquisition/RTU
± ±
± ±
± ±
± ±
± ±
± ±
± ±
± ±
Valve 1
Valve 2
Display
System #2
4-20mA signals going
out to the field
24V DC
24V DC
24V DC
24V DC
±
±
±
±
Output
Input Output
652T-0600
(qty. 2)
674T-0600
(qty. 1)
Analog Inputs (AI)
Analog Outputs
4-20mA
Notes:
1. Three modules require only 3" of panel space!
2. High density = high value:
Two AI's per inch of panel space!
Four AO's per inch of panel space!
3. PS5R requires 1.5" of panel space!
Wired for Loop
Powered Inputs
+
+
+
+
(AO)
4-20mA
4-20mA
4-20mA
4-20mA
+
-
+
-
+
-
+
-
PS5R-SB24
+
-
Field Transmitters
(2-wire devices)
Pressure
Temperature
Level
Flow
100-240V
AC/DC
Application 6
Require 4-wire isolators for input and output
signals for controller. Built-in excitation supply
needed for some field 2-wire devices.
Solution
Model 632T-0100 (dual channel, AC powered) or
Model 632T-0500 (dual channel, DC powered).
Model 631T for single channel 4-wire isolators.
A/D
D/A
DCS/PLC/Controller/
Data Acquisition/RTU
VSD 1
VSD 2
Chart Rec.
System #2
Out
In
In
Out
632T (qty: 4)
Analog Inputs
(4-20mA)
Analog Outputs
(4-20mA)
4-20mA 4-20mA
4-20mA
Notes:
1. Isolator input load (per channel) = 75 ohms max. (1.5V 

DC drop)
2. Input loop(s) are unaffected by faults on output loop

(s)
3. AC powered models operate on 90 - 265V AC or 125V DC ±

10%
4. DC powered models operate on 15 - 36V DC
5. 63xT 4-wire isolators are ideal for isolating both 

input and output
signals for a controller/system.
+
4-20mA
4-20mA
-
+
-
+
-
+
-
+
-
+
-
+
-
+
-
+
-
+
-
+
-
+
-
+
-
+
-
+
-
+
-
EXC
+
-
RTN
EXC
+
-
RTN
EXC
+
-
RTN
EXC
+
-
RTN
EXC
+
-
RTN
EXC
+
-
RTN
EXC
+
-
RTN
EXC
+
-
RTN
+
-
+
-
+
-
+
-
Process Measurement
Temperature
Pressure
Level
Speed
Flow #1
Flow #2
AC or DC Powered
2-wire
field devices
4-wire field devices
with source outputs
630T Application Notes
Isolated Transmitters: 600T Series
248-295-0880 ■  ■  ■  ■ 30765 S Wixom Rd, Wixom, 

MI 48393 USA
– 19 –
Application 7
Require a 4-wire isolator “splitter” to excite a
field device and re-transmit 4-20mA to
two locations.
Solution
Model 633T-0100 (AC powered) or
Model 633T-0500 (DC powered).
Use additional 633T units for re-transmitting
to more locations. Install inputs in series with
primary 4-20mA loop or the re-transmitted loops
as required.
Process Measurement
* Pressure
* Flow
* Level
* Temperature
* Speed
DCS/PLC/Controller
Location #1
2-wire transmitter
4-20mA
Location #2
+
-
Chart Recorder/Data Acquisition/
DCS/PLC Controller
+
-
+
-
+
-
EXC
+
-
RTN
+
-
+
-
Notes:
1. Isolator input load = 150 ohms max. (3V DC drop)
2. Input loop is unaffected by faults on either output 

loop.
3. AC-powered models operate on 90 - 265V AC or 125V DC ±

10%.
4. DC-powered models operate on 15 - 36V DC.
AC or DC Powered
4-20mA
4-20mA
633T
Application 8
Require 4-wire isolators to retransmit a 4-20mA
signal to three locations.
Solution
Model 633T-0x00 (splitter) and
Model 631T-0x00 (one channel isolator).
(Where x = 1 or 5 for AC or DC power)
Process Measurement
* Pressure
* Flow
* Level
* Temperature
* Speed
Primary
DCS/PLC/Controller 2-wire transmitter
4-20mA
+
-
+
-
Notes:
1. Resistance load on primary loop is
225 ohms maximum (4.5V DC drop)
2. Input loop is unaffected by faults on
any output loop
3. AC-powered models operate on
90 - 265V AC or 125V DC ±10%.
4. DC-powered models operate on
15 - 36V DC.
AC or DC
Powered
EXC + - RTN EXC + - RTN
- + - + - + AC or DC
Powered
24V DC
+
631T 633T
4-20mA
4-20mA
4-20mA
+
-
+
-
+
-
Retrans Location #1
Retrans Location #2
Retrans Location #3
5020-350 Application Notes
Using Acromag’s AC current sensor Model 5020-350
Isolated Transmitters: 600T Series
248-295-0880 ■  ■  ■  ■ 30765 S Wixom Rd, Wixom, 

MI 48393 USA
– 20 –
Many Acromag instruments with DC current inputc
can be used in conjunction with an external AC
Current Sensor to precondition an AC current input
signal . This sensor is a highly accurate toroidal instru-
ment transformer that converts an AC current signal
to a safe, low-level, DC milliampere signal (0 to
11 .17mA) .
The transmitters only accept the isolated low-level
signal produced by the AC current sensing transformer
and cannot be connected directly to the source of AC
power without damage or safety risk . The AC Current
Sensor is fully insulated and designed for mounting
near the source of the AC current . The input AC
current range is a simple function of the number of
turns placed on the AC Current Sensor (see the table
below) . The benefits to using an external sensor
(external from the transmitter) include the following:
◆  Low losses:
It is not practical to run AC currents over long dis-
tances because of significant resistance voltage drops
at high currents . The low-level DC milliampere signal
output from the AC Current Sensor can be transmit-
ted safely over long distances, allowing the transmitter
to be remoy located from the AC power wiring .
◆  Safety:
The AC Current Sensor’s output leads can be open
or short circuited and these conditions do not affect
the AC current loop or cause damage to the sen-
sor . Likewise, the wires connecting the AC Current
Sensor to the transmitter can be easily removed from
the transmitter’s input terminals without concern or
hazard .
◆  Ease of Calibration:
The AC current input range can be easily scaled in the
field by simply changing the number of primary turns
at the sensor, with no additional calibration required .
That is, the AC current input span is a simple func-
tion of the number of primary turns placed on the AC
Current Sensor and sensor/transmitter calibration is
not affected by this . Refer to Applications “A” & “B”
of the diagrams on the next page .
Sensor
Primary  AC Current  Sensor Output
Turns  Input Range  (red/black wires)
1  0 to 20 Amps AC  0 to 11 .17mA DC
2  0 to 10 Amps AC  0 to 11 .17mA DC
4  0 to 5 Amps AC  0 to 11 .17mA DC
10  0 to 2 Amps AC  0 to 11 .17mA DC
20  0 to 1 Amps AC  0 to 11 .17mA DC
The AC Current Sensor is isolated and can be used in
AC circuits up to 250V AC, 50 or 60 Hz . It is designed
to be mounted at the source of the AC current to be
measured . The transmitter can be located remoy
from the AC signal and wired using small gauge wire .
The sensor’s output wires can be shorted, open-circuit-
ed, or removed from the transmitter’s input terminals,
without hazard to personnel or the AC Current Sensor .
DANGER:
If the AC Current Sensor is used with an AC Current
Transformer (C .T .), disconnect power to the C .T ., or
short the output of the C .T ., before removing the wire
going through the AC Current Sensor . If this is not
done, an open circuited C .T . will generate high volt-
ages (hazardous) and possible C .T . damage .
The output wires of the sensor are polarized: the
Red wire is (+) plus and the Black wire is (-) minus .
Normally, these output wires are attached to one end
of a cable (user supplied) and the other end connects
to the transmitter’s input . Connect the Current Sensor
output leads to the transmitter input by connecting
Red (+) to the transmitter’s plus (+) terminal, and Black
(-) to the transmitter’s minus (-) terminal . Proper 

polar-
ity must be observed .
WARNING:
The input to the module can only come
from the AC Current Sensor output wires (red/black) .
If AC current is directly attached to the transmitter’s
input terminals, the transmitter will be destroyed and
safety compromised .
For most applications, it is recommended that the
minus (-) transmitter input terminal be connected to
an earth ground . The connections between the AC
Current Sensor would be floating if not grounded .
Grounding eliminates the risk of high common-mode
voltages from showing up on the wires and reduces
noise pickup .
Using Acromag’s
AC current sensor
Model 5020-350
Several Acromag transmitters with DC current
input can be used used in conjunction with an
external AC Current Sensor to precondition an
AC current input signal. This sensor is a highly
accurate toroidal instrument transformer that
converts an AC current signal to a safe, low-
level, DC milliampere signal (0 to 11.17mA).
The transmitters only accept the isolated low-
level signal produced by the AC current sensing
transformer and cannot be connected directly to
the source of AC power without damage or
safety risk. The AC Current Sensor is fully insu-
lated and designed for mounting near the source
of the AC current. The input AC current range is
a simple function of the number of turns placed
on the AC Current Sensor (see the table below).
The benefits to using an external sensor (external
from the transmitter) include the following:
■ Low losses:
It is not practical to run AC currents over long
distances because of significant resistance volt-
age drops at high currents. The low-level DC
milliampere signal output from the AC Current
Sensor can be transmitted safely over long dis-
tances, allowing the transmitter to be remoy
located from the AC power wiring.
■ Safety:
The AC Current Sensor's output leads can be
open or short circuited and these conditions
do not affect the AC current loop or cause
damage to the sensor. Likewise, the wires
connecting the AC Current Sensor to the
transmitter can be easily removed from the
transmitter's input terminals without concern
or hazard.
■ Ease of Calibration:
The AC current input range can be easily
scaled in the field by simply changing the
number of primary turns at the sensor, with
no additional calibration required. That is, the
AC current input span is a simple function of
the number of primary turns placed on the
AC Current Sensor and sensor/transmitter
calibration is not affected by this. Refer to
Applications "A" & "B" of the diagrams on
the next page.
The AC Current Sensor is isolated and can be
used in AC circuits up to 250V AC, 50 or 60 Hz.
It is designed to be mounted at the source of the
AC current to be measured. The transmitter can
be located remoy from the AC signal and
wired using small gauge wire. The sensor's out-
put wires can be shorted, open-circuited, or
removed from the transmitter's input terminals,
without hazard to personnel or the AC Current
Sensor.
DANGER:
If the AC Current Sensor is used with an AC
Current Transformer (C.T.), disconnect power
to the C.T., or short the output of the C.T.,
before removing the wire going through the
AC Current Sensor. If this is not done, an
open circuited C.T. will generate high volt-
ages (hazardous) and possible C.T. damage.
The output wires of the sensor are polarized: the
Red wire is (+) plus and the Black wire is (-)
minus. Normally, these output wires are
attached to one end of a cable (user supplied)
and the other end connects to the transmitter's
input. Connect the Current Sensor output leads
to the transmitter input by connecting Red (+) to
the transmitter's plus (+) terminal, and Black (-)
to the transmitter's minus (-) terminal. Proper
polarity must be observed.
WARNING:
The input to the module can only come
from the AC Current Sensor output wires
(red/black). If AC current is directly attached
to the transmitter's input terminals, the
transmitter will be destroyed and safety
compromised.
For most applications, it is recommended that
the minus (-) transmitter input terminal be con-
nected to an earth ground. The connections
between the AC Current Sensor would be float-
ing if not grounded. Grounding eliminates the
risk of high common-mode voltages from show-
ing up on the wires and reduces noise pickup.
Supported Products
■ InliPack Series Transmitters and Alarms
■ 610T Series Isolated Transmitters
■ ACR Series Isolated Transmitters
■ Flat Pack 250T/350T/450T Series Transmitters
and 361A/461A Series Alarms
■ SmartPack Series L ON W ORKS ® I/O Modules
Acromag's Flat Pack transmitters are shown with the AC 

current sensor toroidal transformer.
Sensor
Primary AC Current  Sensor Output
Turns Input Range (red/black wires)
1 0 to 20 Amps AC 0 to 11.17mA DC
2 0 to 10 Amps AC 0 to 11.17mA DC
4 0 to 5 Amps AC 0 to 11.17mA DC
10 0 to 2 Amps AC 0 to 11.17mA DC
20 0 to 1 Amps AC 0 to 11.17mA DC
248-624-1541  :  
219
A p p l i c a t i o n N o t e s
App Notes
Dimensions
and Electrical
Connections
248-624-1541  :  
220
A p p l i c a t i o n N o t e s
App Notes
Application
Examples
248-624-1541  :  
221
A p p l i c a t i o n N o t e s
App Notes
Barrier Strip Terminal Blocks*
Spring Clamp Terminal Blocks*
Ordering Information
* I/O modules ship with cage clamp terminal blocks .
Terminal block kits are for replacement purposes .
See I/O module information for compatibility
Din-Rail Mounting
For your convenience, Acromag offers several
mounting accessories to simplify your system
installation . Our 19” rack-mount kit provides a
clean solution for mounting your I/O modules
and a power supply . Or you can buy precut DIN
rail strips for mounting on any flat surface .
Ordering Information
20RM-16-DIN
19” rack-mount kit with DIN rail .
DIN RAIL 3.0
DIN RAIL 16.7
DIN rail strip, Type T, 3 inches (75mm) or
16 .7 inches (425mm)
This external sensor measures a 0-20A AC signal
and provides a DC mA output for an Ethernet
input module . It enables remote mounting of the
I/O module for safe monitoring of the AC signal .
Ordering Information
5020-350
AC current sensor
60W Universal Slimline Power Supply
Input Power Requirement
85 to 264V AC or 100 to 370V DC
Output
24V DC, 2 .5A (60W)
Ordering Information
PS5R-SD24
Universal 60W power supply
Visit www .acromag .com for additional models and
more information .
Ordering Information
5035-355
Ethernet straight cable, CAT5, 3 feet long, shielded
5035-360
Ethernet crossover cable, CAT5E, 5 feet long, shielded
◆ Power Supplies
◆ AC Current Sensor
◆ Mounting Hardware ◆ Terminal Blocks
Accessories
RJ45
RJ45
CONNECTS 900EN-S005 SWITCH
TO 9XXEN ETHERNET I/O MODULE
3 Feet LONG
STRAIGHT CAT5 CABLE
Barrier Strip
TBK-B01
Terminal block kit,
two 6-position pieces
TBK-B02
Terminal block kit, four
6-position pieces
TBK-B03
Terminal block kit, one
3-position and three
6-position pieces
Spring Clamp
TBK-S01
Terminal block kit,
two 6-position pieces
TBK-S02
Terminal block kit,
four 6-position pieces
TBK-S03
Terminal block kit,
one 3-position and
three 6-position pieces
Wire range:
AWG #12-26
3-position:
L = 0 .66 inches (16 .9 mm)
6-position:
L = 1 .26 inches (32 .3 mm)
◆ Cables
Isolated Transmitters: 600T Series
248-295-0880 ■  ■  ■  ■ 30765 S Wixom Rd, Wixom, 

MI 48393 USA
– 21 –
F l a t P a c k S e r i e s
270i Isolators
DC Current Input
The 270i accepts a process current input and
provides an isolated 4 to 20mA process current
output signal. Power is received from the input
signal current.
These isolators use transformer isolation to
effectively break the electrical path between the
transmitted signal and the receiving device. This
eliminates ground loops, reduces noise, and
helps protect against transients for more
accurate and reliable measurements.
This product is also extremely easy to install.
All units are factory calibrated for loads up
to 600 ohms to eliminate any need for load
trim adjustments.
Input Range
I 4 to 20mA DC
Output Range
I 4 to 20mA DC
Power Requirement
I 12 to 50V DC @ 20mA (loop-powered),
power is derived from the input signal current.
Loop-burden: 10.8V@250 ohm output load.
Approvals
CSA: C22.2 No. 142
Class I; Division 1; Groups A, B, C, D
Class I; Division 2; Groups A, B, C, D
Class II; Division 1; Groups E, F, G
I Special Features
I Excellent accuracy and stability ensure reliable
measurements in harsh industrial environments.
I 1500V AC peak isolation (250V AC or 354V
DC continuous) prevents ground loops.
I RFI and EMI resistance minimize the effects of
environmental noise.
I Calibration is independent of the load to
eliminate load compensation adjustments
I Zero and span adjustment enable precise
calibration.
I Compact, 1-inch wide housing uses less space
for easier installation in control panels.
I Input current sense resistor simplifies field
diagnostics
I Performance
I Input
Input Range
4 to 20mA input. Power is derived from the input sig-
nal loop. Input current should be limited to less than
50mA to prevent damage to the isolator. In the event
of an open output circuit, the input loop voltage drop
is limited to 20V, nominal. Isolator has reverse polarity
protection.
Zero and span
Zero and span trim adjustments utilize 22-turn poten-
tiometers accessible from front of the unit.
Input voltage drop
The voltage drop is a function of the input current and
load resistance and is calculated as follows:
Input Voltage Drop = 5.4V DC + (0.0216A x R LOAD
Example (R LOAD = 250 ohms):
Input Voltage Drop =
5.4V DC + (0.0216A x 250 ohms) = 10.8V DC.
Current sense resistor
A built-in 10 ohm (±0.1%) resistor can monitor input
current to the isolator. Wiring to the isolator's input
terminals determines if this resistor is included in the
current loop. Use of this resistor provides a test signal
of 40 to 200mV, representing 4 to 20mA.
Continued on the next page.
  
150
Flat Pack
OUT OUT
PLC / DCS
IN
–
+
R L
4-20mA
+
–
+
–
270i
4-20mA
Field
Device
OUT
PLC / DCS
IN
+
– –
+
R L
4-20mA
24V DC
4-20mA
4-20mA Source
250T
+
–
Field
Device
–
+
270i Isolator Diagram
250T Isolator Diagram
For more information about the 250T Transmitter, refer to 

Page 144.
Isolated Transmitters
I s o l a t e d T r a n s m i t t e r s
Performance  (continued)
I Output
Output Range
4-20mA DC output.
A. For R LOAD from 50 to 600 ohms, connect R LOAD
between Output (+) and Output (-) terminals.
B. For R LOAD from 0 to 50 ohms, connect R LOAD
between Output (S) and Output (-) terminals. For
optimum performance at low values of R LOAD , the iso-
lator has a built-in pad resistor of 50 ohms.
1. Input Voltage Drop (input sense resistor not used):
V DROP = 5.4V DC + (0.0216A x (R LOAD + 50 ohms))
2. Input Voltage Drop (input sense resistor used)
V DROP = 5.6V DC + (0.0216A x (R LOAD + 50 ohms))
Accuracy
±0.1% of output span. Error includes the combined
effects of isolator repeatability, hysteresis, terminal
point linearity and adjustment resolution.
Load resistance effect
Less than ±-0.1% of output span as load resistance is
changed over entire range. Allows use of isolator, within
resistance load range, without the need to recalibrate
the isolator for a particular load.
Output ripple
Less than ±0.1% of the maximum output span.
Bandwidth
-3dB at 3Hz, typical.
Response time
For a step input, the output reaches 98% of output
span in 180mS, typical.
I Environmental
Ambient temperature range
Operating: -13 to 185°F (-25 to 85°C).
Storage: -40 to 185°F (-40 to 85°C).
Ambient temperature effect
Less than ±0.006% of output span per °F (±0.01%
per °C) over the ambient temperature range for refer-
ence test conditions. This specification includes the
combined effects of zero and span over temperature.
Isolation
The input and output circuits are isolated from each
other for common-mode voltages up to 250V AC, or
354V DC off ground, on a continuous basis (will with-
stand 1500V AC dielectric strength test for one
minute without breakdown).
Noise rejection
Common mode: 110dB at 60Hz, typical.
RFI resistance
Less than ±0.5%, of output span effect.
EMI resistance
Less than ±0.25% of output span effect.
Surge withstand capability (SWC)
Input/Output terminations rated per ANSI/IEEE C37.90-
1978. Unit is tested to a standardized test waveform
that is representative of surges (high frequency transient
electrical interference), observed in actual 

installations.
Input Options
-20MA: 4.0 to 20.0mA DC
Mounting Options
Mountings
-DIN: DIN rail G or T mount
-ST: SNAPTRACK mount
-SM: Surface-mount
External housings
-N4: NEMA 4, water-tight, holds two
-N12: NEMA 12, oil-tight, holds two
-XP: Explosion-proof NEMA 4, holds one
Approval Options
-NCR: No certification/approval required.
-.
-DT1 † : CSA approval, Div. 2 hazardous locations:
Class I; Div. 2; Groups A, B, C, D.
-EP1 †† : CSA approval, Explosion-proof for hazardous
locations: Class I; Groups B, C, D Class II; Groups E,
F, G. NOTE: Only available with explosion-proof
housing (-XP).
Ordering Notes
* Unit requires factory calibration. Append “-C” to
end of model number. Specify ranges on order.
† Units are shipped separay from any optional
enclosures (i.e. units are not installed in any external
housing).
†† Units shipped installed in external enclosure.
Accessories
Power supplies
See Power Supplies on Page 199.
DIN RAIL 3.0
DIN RAIL 16.7
DIN rail strip, Type T, 3 inches (75mm) or
16.7 inches (425mm)
20RM-16-DIN
19" rack-mount kit with DIN rail.
Holds sixteen 270i isolators.
  
151
I Ordering Information
Select one option from each column. Example: 270i-20MA-

DIN-NCR
Base Input Mounting Approval
270i -20MA -DIN -N4 -NCR
-ST -N12 -DT1
-SM -XP -
Flat Pack
F l a t P a c k S e r i e s
330i and 430i
Signal Isolators
DC Current Input
Models
330i: DC-powered transmitter series
430i: AC-powered transmitter series
Input Range
I 4 to 20mA DC
Output Range
I 4 to 20mA DC
Power Requirements
I 330i: 10 to 36V DC
85mA with 15V supply, 55mA at 24V
I 430i:
115V AC @ 0.040A
230V AC @ 0.020A
I Description
Series 330i and 430i isolators provide 3-way
isolation and do not require recalibration for
different loads.
Both the 330i and 430i accept a 4 to 20mA
process current input and provide a 3-way
isolated process current output signal.
These isolators use transformer isolation to
effectively break the electrical path between the
transmitted signal, receiving device, and power.
This eliminates ground loops, reduces noise, and
helps protect sensitive instruments from transients
for more accurate and reliable measurements.
The 330i and 430i are also extremely easy to use.
Advanced circuitry eliminates the need to recali-
brate as loads change and allows us to provide
factory calibration regardless of the load. And,
for highly reliable field operation, they withstand
extreme ambient temperatures and have excel-
lent temperature coefficients.
I Special Features
I 3-way isolation; input, output, and power
circuits are isolated from each other.
I 1500V AC peak isolation (250V AC or 354V
DC continuous) prevents ground loops.
I Excellent accuracy and stability ensure reliable
measurements in harsh industrial environments
I RFI and EMI resistance minimize the effects of
environmental noise
I Factory calibration is provided standard
I Calibration is independent of the load to
eliminate load compensation adjustments
I Wide power supply range on 330i handles
more applications to reduce inventory stock
I DC power used with 330i carry lower voltages
and do not require expensive conduit for safer
and easier installation.
I Low input burden (1.3V typical), independent
of load, helps prevent overloading of the loop
I High load compliance drives output load
resistances up to 1050 ohms independent of
supply voltage
I 25mS response time delivers fast updates to
monitoring and control systems.
I Zero and span adjustment enable precise
calibration.
  
154
Flat Pack
OUT
PLC / DCS
IN
+
– –
+
Rs
4-20mA
Source
4-20mA
3-way
Isolation
430i
115/230V AC
OUT
PLC / DCS
IN
+
– –
+
Rs
4-20mA
Source
10-36V DC
4-20mA
3-way
Isolation
330i
330i Isolator Diagram
430i Isolator Diagram
Isolated Transmitters
I s o l a t e d T r a n s m i t t e r s
I Performance
Reference test conditions
Input/Output current: 4 to 20mA; output load 250
ohms; 25°C ambient; 15V DC or 115V AC supply.
I Input
Input
4 to 20mA DC, with an input drop less than 1.5V DC
(75 ohms) at full-scale. IMPORTANT: Input current
must not exceed 100mA or damage to the unit may
occur.
Zero and span
Zero and span trim adjustments utilize 15-turn
potentiometers accessible on front of the unit.
I Output
Output
4 to 20mA DC R LOAD = 0 to 1050 ohms.
Output limiting
Output current limited to less than 28mA, nominal.
Output ripple
Less than ±0.1% of maximum output span.
Accuracy
Better than ±0.1% of output span. Error includes the
combined effects of isolator repeatability, hysteresis,
terminal point linearity and adjustment resolution.
Does not include sensor error.
Bandwidth
-3dB at 50Hz, typical, with 500 ohm load.
Response time
For a step input, the output reaches 98% of output
span in 25mS, typical, with a 500 ohm load.
Response time will vary with load resistance.
I Power
Power (330i)
10V to 36V DC, current draw is a function of supply
voltage (refer to table below)
Supply Supply Current At Current
Voltage at 20mA Output Limit
10V 135mA 200mA
12V 105mA 145mA
15V 85mA 110mA
24V 55mA 70mA
36V 45mA 50mA
Power (430i)
-1: 115V AC ±10%, 50 to 60Hz, 0.040A max.
-2: 230V AC ±10%, 50 to 60Hz, 0.020A max.
Power supply effect
330i: Less than ±0.001% of output span per volt for
rated supply variations.
430i: Less than ±0.01% of output span for rated
supply variations.
I Environmental
Ambient temperature range
-13 to 185°F (-25 to 85°C)
Ambient temperature effect
Less than ±0.003% of output span per °F (±0.005%
per °C) over the ambient temperature range for refer-
ence test conditions. This specification includes the
combined effects of zero and span over temperature.
Isolation
Three-way isolation between input, output, and power
circuits for common mode voltages up to 250V AC, or
354V DC off ground, on a continuous basis (withstand
1500V AC dielectric strength test for sixty seconds
without breakdown).
Noise rejection
Normal Mode: -6 dB at 60Hz, typical, 500 ohm load.
RFI resistance
Less than ±0.5%, of output span with RFI field
strengths of up to 10V/meter at frequencies of 27,
151 and 467 MHz.
EMI resistance
Less than ±0.25% of output span effect with switch-
ing solenoids or commutator motors.
Surge withstand capability (SWC)
Input/Output terminations rated per ANSI/IEEE C37.90-
1978. Unit is tested to a standardized test waveform
that is representative of surges (high frequency transient
electrical interference), observed in actual 

installations.
I Physical
Construction
Circuit boards: Military grade FR-4 epoxy glass.
Terminals: Compression type, 14 AWG max.
Case: Self-extinguishing NYLON Type 6.6 polyamide
thermoplastic UL94V-2, color black. General Purpose,
NEMA Type 1 enclosure.
Circuit board coating: Fungus resistant acrylic
conformal coat.
Mounting position: Position insensitive.
I Ordering
Information
Isolators
330i-C1-Y-DIN-NCR
Single-channel isolator unit, DC-powered.
430i-C1-Y-1-DIN-NCR
Single-channel isolator unit, 115V AC-powered.
430i-C1-Y-2-DIN-NCR
Single-channel isolator unit, 230V AC-powered.
Accessories
Power supplies
See Power Supplies on Page 199.
DIN RAIL 3.0
DIN RAIL 16.7
DIN rail strip, Type T, 3 inches (75mm) or
16.7 inches (425mm)
20RM-16-DIN
19" rack-mount kit with DIN rail. Holds ten 330i or
430i transmitters.
350T-N4-WM
NEMA 4 water-tight enclosure, wall-mount.
Holds one 330i/430i transmitter.
350T-N12-WM
NEMA 12 oil-tight enclosure, wall-mount.
Holds one 330i/430i transmitter.
  
155
Flat Pack
F l a t P a c k S e r i e s
340i Isolators
DC Current Input
Input Range
I 4 to 20mA DC
Output Range
I 4 to 20mA DC
Power Requirement
I 10 to 36V DC @ 30mA
I Description
The 340i accepts a process current input and
provides an isolated 4 to 20mA process current
output signal.
These isolators use transformer isolation to
effectively break the electrical path between
the transmitted signal and the receiving device.
This eliminates ground loops, reduces noise,
and helps protect against transients for more
accurate and reliable measurements.
This product is also extremely easy to install.
All units are factory calibrated to eliminate any
need for load trim adjustments. Also, up to
eight isolators at a location can share a single
Acromag 35PS power supply for a more
convenient and cost-effective solution.
I Special Features
I Excellent accuracy and stability ensure reliable
measurements in harsh industrial environments.
I 1500V AC peak isolation (250V AC or 354V
DC continuous) prevents ground loops.
I Calibration is independent of the load to elimi-
nate load compensation adjustments
I Zero and span adjustment enable precise
calibration.
I RFI and EMI resistance minimize the effects of
environmental noise.
I Low power consumption helps prevent
expensive upgrades to larger power supplies.
I 25mS response time delivers fast updates to
monitoring and control systems.
I Compact, 1-inch wide housing uses less space
for easier installation in control panels.
  
152
Flat Pack
OUT
PWR
PLC / DCS
Input
Isolation
IN
+
L
–
P
–
+
R LOAD
24V DC
4-20mA
P
–
+
340i
340i Isolator Diagram
Isolated Transmitters
I s o l a t e d T r a n s m i t t e r s
I Performance
Reference test conditions
Input/Output current: 4 to 20mA; output load 250
ohms; 77°F (25°C); 15V DC supply.
I Input
Input
4 to 20mA DC, input drop less than 1.5V at full-scale.
Input current must not exceed 100mA.
Zero and span
The Zero and Span trim adjustments utilize 15-turn
potentiometers which are accessible from the front of
the unit. Isolator is DIN-rail mounted.
I Output
Output
4 to 20mA DC.
The output shares a common with the power supply.
NOTE: Voltage output is not available on this unit, use
Model 350T on Page 144 if this is a requirement.
Load resistance range equation
R LOAD MAX = (Min. VDC supply - 5.0V) / 0.02A
At 10.0V DC supply, R LOAD = 0 to 250 ohms
At 15.0V DC supply, R LOAD = 0 to 500 ohms
At 24.0V DC supply, R LOAD = 0 to 950 ohms
Output limiting
135% of full scale output, nominal.
Output ripple
Less than ±0.1% of maximum output span.
Bandwidth
-3dB at 50Hz, typical, with 500 ohm load.
Response time
For a step input, the output reaches 98% of output
span in 25mS, typical, 500 ohm load.
Accuracy
Better than ±0.1% of output span. Error includes the
combined effects of isolator repeatability, hysteresis,
terminal point linearity and adjustment resolution.
Does not include sensor error.
I Power
Power
10.0V to 36.0V DC, 30mA at full scale, 35mA at limit.
The external DC power supply is connected between
the output (P) and (-) terminals. The current specified
is for rated supply inputs and full scale output. Diode
on isolator provides reverse polarity protection. Note:
Do not exceed 36V DC peak, to avoid damage to the
isolator.
Power supply effect
DC Volts: Less than ±0.001% of output span per volt.
60/120Hz Ripple: Less than ±0.01% of span per volt
peak to peak of power supply ripple.
I Environmental
Ambient temperature range
Operating: -13 to 185°F (-25 to 85°C).
Storage: -40 to 185°F (-40 to 85°C).
Ambient temperature effect
Less than ±0.003% of output span per °F (±0.005%
per °C) over the ambient temperature range for refer-
ence test conditions. This specification includes the
combined effects of zero and span over temperature.
Isolation
The input circuit is electrically isolated from the output
and power circuits, allowing the input to operate at
up to 250V AC, or 354V DC off ground, on a continu-
ous basis (will withstand 1500V AC dielectric strength
test for one minute without breakdown). Complies
with test requirements outlined in ANSI C39.5-1974
for the voltage rating specified.
Noise rejection
Common mode: -6 dB at 60Hz, typical, 500 ohm load.
RFI resistance
Less than ±0.5%, of output span with RFI field
strengths of up to 10V/meter at frequencies of 27,
151 and 467 MHz.
EMI resistance
Less than ±0.25% of output span effect with switch-
ing solenoids or commutator motors.
Surge withstand capability (SWC)
Input/Output terminations rated per ANSI/IEEE C37.90-
1978. Unit is tested to a standardized test waveform
that is representative of surges (high frequency transient
electrical interference), observed in actual 

installations.
I Physical
Construction
Circuit boards: Military grade FR-4 epoxy glass.
Terminals: Compression type, 14 AWG max.
Case: Self-extinguishing NYLON Type 6.6 polyamide
thermoplastic UL94V-2, color black. General Purpose,
NEMA Type 1 enclosure.
Circuit board coating: Fungus resistant acrylic confor-
mal coat.
Mounting position: Position insensitive.
I Ordering
Information
Isolator
340i-C1-Y-DIN-NCR
Single-channel 4-20mA isolator.
Accessories
Power supplies
See Power Supplies on Page 199.
DIN RAIL 3.0
DIN RAIL 16.7
DIN rail strip, Type T, 3 inches (75mm) or
16.7 inches (425mm)
20RM-16-DIN
19" rack-mount kit with DIN rail. Holds sixteen 340i
transmitters.
350T-N4-WM
NEMA 4 water-tight enclosure, wall-mount.
Holds two 340i transmitters.
350T-N12-WM
NEMA 12 oil-tight enclosure, wall-mount.
Holds two 340i transmitters.
  
153
Flat Pack
F l a t P a c k S e r i e s
Dimensions
  
172
Flat Pack
Transmitters: 250T, 350T
Isolators: 270i, 340i,
Limit Alarms: 260A
Power Supplies: 25PS, 35PS-2U
Surface Mount:
250T-SM,
260A-SM,
270i-SM,
25PS-SM
Snaptrack
Mount:
250T-ST,
260A-ST,
270i-ST,
25PS-ST
Dimensions are in inches (millimeters).
S i g n a l C o n d i t i o n e r s
  
173
Dimensions
Explosion-Proof and Industrial Housing
250T-XP,
260A-IH/IHW,
270i-XP
250T Transmitter shown installed in enclosure
with cover removed.
250T Transmitter shown removed
from enclosure.
NEMA-4 and NEMA-12
Enclosures
250T-N4 / N12, 25PS-N4 / N12
260A-N4 / N12, 270i-N4 / N12
Dimensions are in inches (millimeters).
Flat Pack
F l a t P a c k S e r i e s
Dimensions
  
174
Transmitters: 450T
Isolators: 330i, 430i,
Limit Alarms: 361A, 461A
Power Supplies: 35PS-8U
NEMA-4 and NEMA-12 Enclosures
350T-N4-WM
350T-N12-WM
Dimensions are in inches (millimeters).
Flat Pack
S i g n a l C o n d i t i o n e r s
Dimensions
  
175
20RM-16-DIN
Rack Mount Kit
Dimensions are in inches (millimeters).
AC Sensor
5020-350
Flat Pack
1 5 0 0 S e r i e s
151T/155H Units
Universal Input
(TC, RTD, mV, ohms)
Models
151T: PC-configured transmitter
155H: HART ® -configured transmitter
ATW-TLD: Optional plug-in LCD display with
two-line text and bar graph readout
Input Ranges
Universal input with PC or HART configuration
■ RTD (2, 3, and 4-wire),
100 ohm Pt DIN (alpha = 0.00385),
100 ohm Pt SAMA, (alpha = 0.003923)
10 ohm Cu, 100 ohm Ni, 120 ohm Ni
■ Thermocouple: B, C, E, J, K, L, N, R, S, T, U
■ Millivolt (-15 to 115mV)
■ 4 to 20mA DC (with optional 5 ohm resistor)
■ Resistance (0 to 500 ohms)
Output Ranges
■ 4 to 20mA (both models)
■ HART protocol (155H model only)
Power Requirement
■ Loop-powered (2-wire), 12 to 42V DC
Approvals
■ CE marked. CSA:
Class I Division 2 Groups A, B, C, D.
■ Description
These programmable transmitters convert tem-
perature and other sensor inputs to a proportion-
al process current signal. A HART protocol output
is optional.
Acromag’s 1500 series transmitters bring the
best elements of analog and smart digital tech-
nologies together to offer unsurpassed value for
temperature measurement applications. They
deliver superior accuracy, unrivaled versatility, and
are extremely easy to use. Save time. Cut costs.
And improve performance.
Two models are available. The 151T model is a
standard PC-configurable two-wire transmitter.
The 155H is a two-wire transmitter with a HART
interface for communication and configuration.
Options include a plug-in LCD display and an
explosion-proof enclosure. The two-line display
provides a 4½ digit readout in °C or °F, a bar
graph, and a text line for tag information. Push-
buttons on the display unit allow you to config-
ure the transmitter in the field. The enclosure is
ideal for field mounting in hazardous locations. A
window maintains visibility for the LCD display.
■ Special Features
■ Microprocessor reduces setup time, improves
performance, and performs self-diagnostics.
■ M*riable transmitter accepts a variety of
input sensor types to meet most applications
and help minimize inventory requirements.
■ Multifunction LCD readout displays tempera-
ture in °C or °F, a bar graph, the tag name,
and diagnostic data.
■ Flexible configuration supports setup via a PC
with Acromag’s software interface package, a
standard handheld 275 HART communicator
(155H only), or by using pushbuttons on the
optional LCD display.
■ 22-breakpoint linearizer table helps the user
define custom output transfer functions.
■ Sensor break detection and reporting functions
allow users to specify a failsafe output and
post a message on the optional LCD display.
■ Automatic cold-junction compensation ensures
high accuracy over a wide temperature range.
■ Isolation between input/output circuits allows
the use of grounded or ungrounded sensors.
■ Output ranges can be set in engineering units
anywhere within the input sensor range. No
minimum/maximum span limitation.
Explosion-proof and NEMA 4X stainless steel
industrial enclosures are available.
4
+
1
-
Sensor
Input
IN
OUT
24V DC
R LOAD
250Ω
4-20mA
Optional HART interface
PLC / DCS 155H
3
2
PC or HART ® -configured Two-Wire Transmitter
  
180
1500 Series
Smart Transmitters
Model 151T
PC Configuration
1500 Series
Installation
Input Connections
  
181
I s o l a t e d T r a n s m i t t e r s
The Display Data screen shows the current status of the 

transmitter and simulates the readout on the optional
LCD display.
Configuring Acromag’s 15IT and 155H transmitters is easy. 

The software interface package provides simple
pull-down selection menus and fill-in-the-blank fields.
2
3
JUMPER 3 TO 4
INPUT
TC
JUMPER 3 TO 4
-
+
JUMPER 3 TO 4
2
3
-15 to 115mV
(standard input)
Optional 5 ohm
precision resistor
for 4-20mA input
(20 to 100mV span)
RESISTANCE
3
2
(KELVIN)
4-WIRE
RTD
1
4
4
JUMPER 3 TO 4
1
4
JUMPER 3 TO 4
RTD
3-WIRE
2-WIRE
3
2
1
4
4
2
3
1
2
3
4
1
1
JUMPER 1 TO 2
RTD
DECADE BOX
JUMPER 1 TO 2
DC mV/mA
Dual RTD connections are
supported for “average”
or “differential” outputs
Dual TC connections
are also supported for
“differential” outputs
also
1500 Series
248-295-0880 ■  ■  ■  ■ 30765 S Wixom Rd, Wixom, 

MI 48393 USA
Bulletin #8400-569
Description
Acromag’s configuration software is the key to
the 151T and 155H transmitters’ easy-to-use
operation. The software employs the friendly
Windows ® interface with pull-down selection
menus and fill-in-the-blank fields to speed you
through a few brief configuration screens. No
programming is required.
The software interface package for 151T-0600
transmitters includes a user manual, CD-ROM,
transmitter-to-DB9 interface adapter, and
DB9-to-USB adapter.
The software interface package for 155H-0600
transmitters includes a user manual, CD-ROM,
and transmitter-to-DB9 interface adapter.
Software Compatibility
Windows 98, 2000, ME, NT, XP, Vista, 7.
Ordering Information
NOTE: For more information, visit .
Models
151C-SIP
Software interface package for 151T-0600. Includes
user manual, CD, PC serial port adapter (5032-787),
and USB adapter (4001-095).
155H-SIP
Software interface package for 155H-0600. Includes
user manual, CD, PC serial port adapter (5032-780),
and USB adapter (4001-095).
4001-095
USB-to-DB9 serial port (RS232) adapter.
5032-780
PC serial port (RS232) adapter for 155H-0600
Transmitter-to-DB9 connection.
5032-787
PC serial port (RS232) adapter for 151T-0600
Transmitter-to-DB9 connection.
Connection Diagram
See following page.
Configuration Software ◆ USB-to-RS232 Adapter ◆ RS232 

Interface Adapter
Model 151C-SIP, 155H-SIP Configuration Software Interface 

Package
Series 151T, 155H Transmitters
248-295-0880 ■  ■  ■  ■ 30765 S Wixom Rd, Wixom, 

MI 48393 USA
All trademarks are property of their respective owners. 

Copyright © Acromag, Inc. 2009. Data subject to change 

without notice. Printed in USA 6/2010.
Series 151T, 155H Transmitters
1 2 3 4
-
LSK Modem
1046-016
LSK Modem
1
4
3 & 4 Wire RTD
R L
Plug into top
Temperature
Transmitter
+
4-20mA
Acromag
1046-016
Acromag
-T/C, mV+
- -
+
of 151T
+
9-PIN DB9S CONNECTOR
EARTH
12 TO 42VDC
SERIAL PORT OF THE
HOST COMPUTER, OR
MATES TO THE DB9P
GREEN LED
2
V-LOAD
GROUND
DC
CONNECTOR AT THE
PERSONAL COMPUTER WITH
WINDOWS OPERATING SYSTEM
TOP VIEW
YELLOW LED
POWER
RECEIVE: GREEN LED BLINKS, YELLOW LED OFF.
LED FUNCTIONS:
SERIES 151T COMPUTER CONNECTIONS
STATIC (NO TRANSFER): BOTH LED's ON.
TRANSMIT: YELLOW LED BLINKS, GREEN LED OFF.
(COM PORTS ARE SOFTWARE CONFIGURED)
ATTACH ADAPTER TO COM1 OR COM2 ON THE PC.
6 FEET OF CABLE
USB MALE
DB9
RS232
USB SERIAL CONVERTER 4001-095
LED
TO HOST USB PORT
OR
HOST
USB
TO HOST RS232 SERIAL PORT
HOST
RS232
DB9
HOST RS232 SERIAL
PORT CONNECTOR OR
USB CONNECTOR AT
BACK OF PC
ATTACH ADAPTER 5032-787 TO USB ADAPTER 4001-095, OR
PC RUNNING
TRANSMITTER
CONFIGURATION
SOFTWARE
151T-0600 TRANSMITTER
PLUG INTO TOP
OF TRANSMITTER
TOP VIEW
6 FEET OF CABLE
INTERFACE ADAPTER 5032-787
DISPLAY ATW-TLD MUST BE
REMOVED TO INSTALL THE
INTERFACE ADAPTER
USB ADAPTER 4001095
4501-771C
+
-
1 2
L
R
3 4
1
-T/C, mV+
GROUND
4-20mA
V-LOAD
–
2
EARTH
+
DC
+
4
9 PIN CONNECTOR (DB9S)
SERIAL PORT OF THE
HOST COMPUTER
MATES TO THE DB9P
RS232
TEST CLIPS
(NON-POLARIZED)
TEST
POINT
3 & 4 Wire RTD
TEST
POINT
CONNECTOR AT THE
PC RUNNING
TRANSMITTER
CONFIGURATION
SOFTWARE
TEST CLIPS MAY
CONNECT TO TEST
POINTS OF 155H
TRANSMITTER OR
ACROSS R-LOAD
155H
TRANSMITTER
PERSONAL COMPUTER WITH
WINDOWS OPERATING SYSTEM
12 TO 42VDC
POWER
INTERFACE ADAPTER 5032-780
ATTACH ADAPTER TO COM PORT ON THE PC.
COM PORTS ARE SOFTWARE CONFIGURED.
THERMOCOUPLE, RTD,
or MILLIVOLT INPUT
SERIES 155H COMPUTER CONNECTIONS
6 FOOT OF CABLE
4501-763B
1 5 0 0 S e r i e s
151T/155H Units
Installation
Dimensions
  
182
1500 Series
ENTER
1.70"
(43.18mm)
NEXT
2.30"
(58.42mm)
1
2 3
4
+
3 4 1
–
-T/C, mV+
2
3 & 4 Wire RTD
2.14"
(54.36mm)
0.85"
(21.59mm)
2.50"
(63.5mm)
0.45"
(11.43mm)
2.00"
(50.8mm)
2.35"
(60mm) SET SCREW
(2 PLACES)
5.0"
(127mm)
3/4" NPT HOUSING
1/2" NPT NIPPLE
(2 PLACES)
5/16 DIA
(2 PLACES)
5.25"
(133mm)
GROUND
SCREW
151T/155H
TRANSMITTER
W/ATW-TLD
DISPLAY
ENTER NEXT
0.76"
(19mm)
5.0"
(127mm)
2.5"
(63.5mm)
0.80"
(20.3mm)
ALLOW 5.65" FOR
COVER REMOVAL
4.65"
(118.1mm)
PC Configuration Connections
ATW-XPW Dimensions
DIN Rail Mounting
Pipe Mounting
ATW-DIN
ATW-PM2
ATW-SSW Dimensions
0.97
0.97
3.14
2.75
3.50
3.15
2.70
I.D.
0.72
CAP
2.42
INSIDE DEPTH
O-RING
MATERIAL: 304 STAINLESS STEEL
SANITARY GRADE 3A
DIMENSIONS: INCHES
TOLERANCE: ±0.010 INCHES
1/2 - INCH NPT (2 PLACES)
1.13
0.57
2.25 INCH DIAMETER
VIEWING WINDOW
6-32 x 0.375
THREADED
STANDOFF
(2 PLACES)
RS232
1
4
3 4
3 & 4 Wire RTD
2
-T/C, mV+
1 2
TEST
POINT
–
4-20mA
+
DC
POWER
+
+
-
R-LOAD
250Ω
TEST
POINT
155H TRANSMITTER
TEST CLIPS
(NON-POLARIZED)
6 FOOT OF CABLE
12 TO 42VDC
GROUND
EARTH
3
6 FEET OF CABLE
TOP VIEW
Acromag
1046-016
V-LOAD
4-20mA
R L
+
-
+
DC
POWER
12 TO 42VDC
EARTH
GROUND
3 & 4 Wire RTD
3 4
+
-T/C, mV+
1 2
–
1
2
4
PLUG INTO TOP
OF TRANSMITTER
DISPLAY ATW-TLD MUST
BE REMOVED TO INSTALL
INTERFACE ADAPTER
TOP VIEW
3
TO RS232 PORT
151T TRANSMITTER
WINDOWS 95/98/NT
PC RUNNING
ACROMAG
CONFIGURATION
SOFTWARE
ATTACH ADAPTER TO COM PORT ON THE PC.
COM PORTS ARE SOFTWARE CONFIGURED
155C-SIP
INTERFACE ADAPTER
151C-SIP
INTERFACE ADAPTER
Acromag
1046-016
Transmitter
temperature
of 151T
plug into top
MODEL 5032-787
■ Performance
■ General Input
Digital Input Accuracy
±0.05% of equivalent millivolt or ohm reading, or the
accuracy shown in range tables, whichever is greater.
Ambient Temperature Effect
Self-correcting over full operating temperature range
for changes up to 20°C/hour. Error is less than half the
reference accuracy plus 0.1°C per 28°C change.
Noise Rejection
Common Mode: Better than 120dB @ 60Hz.
Sensor Break Detection
Failsafe response configurable for upscale (23mA),
downscale (3.6mA), or no circuit response.
Linearization
TC and RTD linearization to ±0.05°C. Custom software
configuration table supports up to 22 breakpoints.
Input Conversion Rate
7 conversions per second (150mS), typical.
Cold Junction Measurement Accuracy
±0.5°C (±0.9°F).
Input Impedance
Thermocouple/millivolt input: 0.2M ohm.
RTD/resistance input: 1M ohm.
RTD Input Configuration
Supports two, three, and four-wire (Kelvin) RTDs.
RTD Excitation Current
0.3mA nominal.
■ Input Ranges & Accuracy
■ Output
Output Range
4 to 20mA DC.
Output Accuracy
±0.05% of span.
Output Load Compliance
R LOAD = (V SUPPLY - 12V) / 23mA.
500 ohm @ 24V DC supply.
Output Response Time (for input step change)
250mS typical to 98% of final output value.
Output Action
Normal or reverse acting.
Damping
Adjustable from 0 to 32 seconds.
■ Environmental
Ambient Temperature Range (Operating)
Electronics: -40 to 85°C (-40 to 185°F).
Display: -20 to 70°C (-4 to 158°F).
Relative Humidity
5 to * non-condensing.
Power Requirements
12 to 42V DC @ 25mA.
Isolation
250V AC (354V DC) continuous isolation between
input and output circuits.
Approvals
CE marked.
CSA: Class I; Division 2; Groups A, B, C, D.
EMI/RFI Susceptibility
Less than ±0.5% of reading at 10V/m, 20KHz-1GHz.
Electrical Fast Transient (EFT)
Complies with EN61000-4-4 Level 3 and EN50082-1.
Surge Withstanding Capability (SWC)
Complies with EN61000-4-5 Level 3 and EN50082-1.
Electrostatic Discharge (ESD)
Complies with EN61000-4-2 Level 3 and EN50082-1.
Radiated Emissions
Meets or exceeds EN50081-1 for Class B equipment.
■ Physical
Enclosure
Sealed Lexan ® plastic with waterproof potting.
Connectors
Wire Range: AWG #10-24.
Printed Circuit Boards
Military grade FR-4 epoxy glass circuit board.
Shipping Weight
1 pound (0.45 Kg) packed.
■ Ordering
Information
Models
151T-0600-C
PC-configured transmitter (no HART protocol).
Default calibration TC Type J thermocouple,
input: 40 to 200°F, output: 4 to 20mA unless
customer specified
155H-0600-C
HART-configured transmitter, calibration same as
above
151C-SIP
Software interface package for 151T-0600. Includes
user manual, CD-ROM, PC serial port adapter, cable.
155H-SIP
Software interface package for 155H-0600. Includes
user manual, CD-ROM, PC serial port adapter, cable.
ATW-TLD
Plug-in LCD display (compatible with 151T and 155H)
Accessories
5032-850: Precision 5 ohm (4 to 20mA sensing)
resistor, 0.1%, 0.75W.
5034-225: USB-to-RS232 adapter
ATW-XPW: Explosion-proof housing
ATW-SSW: NEMA4X stainless steel non-corrosive
housing
ATW-DIN: DIN-rail mounting adapter
ATW-PM2:2-inch pipe mount kit for ATW-XPW
8500-613: Configuration User’s Manual for use with
hand-held 275 HART communicator.
All trademarks are the property of their owners.
  
183
I s o l a t e d T r a n s m i t t e r s
Input Type Input Range Minimum Span Accuracy
TC Type B 260 to 1820°C (109 to 3272°F) 100°C (212°F) 

±0.8°C (±1.5°F)
TC Type C 0 to 2320°C (32 to 4208°F) 100°C (212°F) 

±0.8°C (±1.5°F)
TC Type E -270 to 1000°C (-454 to 1832°F) 20°C (68°F) 

±0.3°C (±0.5°F)
TC Type J -210 to 1200°C (-346 to 2192°F) 20°C (68°F) 

±0.3°C (±0.5°F)
TC Type K -270 to 1372°C (-454 to 2502°F) 20°C (68°F) 

±0.3°C (±0.5°F)
TC Type L -200 to 900°C (-328 to 1652°F) 20°C (68°F) 

±0.3°C (±0.5°F)
TC Type N 270 to 1300°C (518 to 2372°F) 20°C (68°F) ±

0.3°C (±0.5°F)
TC Type R 50 to 1768°C (122 to 3214°F) 25°C (77°F) 

±0.8°C (±1.5°F)
TC Type S -50 to 1768°C (-58 to 3214°F) 25°C (77°F) ±

0.8°C (±1.5°F)
TC Type T -270 to 400°C (-454 to 752°F) 20°C (68°F) ±

0.3°C (±0.5°F)
TC Type U -200 to 600°C (-328 to 1112°F) 100°C (212°F) 

±0.8°C (±1.5°F)
Millivolt -15 to 115mV DC 3mV ±0.1mV
DC current (4-20mA) 20 to 100mV DC  Requires 5032-850 

precision resistor
Platinum RTD,  -200 to 850°C (-328 to 1562°F) 10°C (50

°F) ±0.14°C (±0.25°F)
100 ohm, alpha = 385, 392
Nickel RTD, 120 ohm -80 to 320°C (-112 to 608°F) 10°C 

(50°F) ±0.14°C (±0.25°F)
Nickel RTD, 100 ohm -60 to 250°C (-76 to 482°F) 10°C 

(50°F) ±0.14°C (±0.25°F)
Copper RTD, 10 ohm -70 to 150°C (-94 to 302°F) 100°C 

(212°F) ±0.14°C (±0.25°F)
Resistance  0 to 500 ohm n/a ±0.06 ohm
1500 Series
248-295-0880 ■ 248-624-9234 ■  ■  ■ 30765 

Wixom Rd, Wixom, MI 48393 USA
Transmitters: TT230 Series
Bulletin #8400-660e
Description
The TT231 model is a space-saving two-wire
transmitter that converts a 100 ohm Platinum
RTD sensor input to a proportional 4-20mA
signal. Power is received from the output loop
current or a DC supply when using a three-wire
connection. The transmitter provides sensor
excitation plus performs linearization, lead-wire
compensation, and lead-break detection.
Setup and calibration are fast and easy with
a convenient USB connection to your PC and
Acromag’s Windows configuration software.
Advanced signal processing capabilities, variable
range input, and convenient USB programming
make this instrument a very versatile temperature
measurement device. These transmitters can
withstand harsh industrial environments and
operate reliably across a wide temperature range
with very low drift. They feature RFI, EMI, ESD,
EFT, and surge protection plus low radiated
emissions.
Key Features & Benefits
■ Easy setup and digital calibration via USB with
Windows configuration software
■ Flexible RTD or linear resistance input ranges
(any 100 ohm Pt RTD with 375-393 alpha)
■ Space-saving 12.5mm (0.5 inch) unit with
pluggable terminals for convenient wiring
■ High accuracy, linearity, stability, and reliability
■ Advanced analog signal conditioning ASIC
eliminates digitization errors
■ Low temperature drift (<80ppm/°C)
■ Supports sink or source output wiring
■ Programmable over/under-range limits
■ Selectable upscale or downscale operation for
sensor errors and lead-break detection
■ NAMUR-compliant output loop current
■ Shock (25g) and vibration (4g) resistant
■ Mounts on Type T DIN-rail
■ Wide ambient operation (-40 to 80°C)
■ CE compliant. UL/cUL Class 1 Div 2 Zone 2
approvals
100 ohm Pt RTD or 0-900 ohm input ◆ 4-20mA output 

(sink/source) ◆ 12-32V DC loop/local power
TT231 RTD/resistance input two-wire/three-wire transmitter
+
–
6
5
I
I
+
RCV
P
DCS/PLC
SOURCING
INPUT CARD
24VDC
TOP VIEW
(OUTPUT SIDE)
+
–
6
5
6 5
7
8
8 7
R
I
+
–
LOAD
C
C
I
24V DC
LOCAL
SUPPLY
Local Power Supply w/ Sourced Output
Loop-Powered w/ Sinking Output
+
–
+
–
SINKING
INPUT
CARD
IN–
L
2
1
3
4
2-WIRE 3-WIRE 4-WIRE
(2-WIRE ONLY)
ADD JUMPER
BOTTOM VIEW
(INPUT SIDE)
2 1
4 3
114.5 mm
(4.51 in.)
12.5 mm
(0.50 in.)
99.0 mm
(3.90 in.)
SIDE VIEW
IN+
H
Platinum RTD or Resistance Input
TT230 Series Transmitter
Configuration Software is
downloadable (FREE) from
.
Windows XP, Vista, 7, & 8
USB
Configured
248-295-0880 ■ 248-624-9234 ■  ■  ■ 30765 

Wixom Rd, Wixom, MI 48393 USA
All trademarks are property of their respective owners. 

Copyright © Acromag, Inc. 2015. Data subject to change 

without notice. Printed in USA 5/2015
Transmitters: TT230 Series
TT231 RTD/resistance input two-wire/three-wire transmitter
Performance Specifications
■ USB Interface
USB Connector
USB Mini-B type socket, 5-pin.
USB Data Rate
12Mbps. USB v1.1 and 2.0 compatible.
USB Transient Protection
Transient voltage suppression on power and data lines.
USB Cable Length
5.0 meters maximum.
Driver
Not required. Uses built-in Human Interface Device
(HID) USB drivers of the Windows operating system.
■ Input
Default Configuration
100Ω Pt RTD, α=0.00385 Ω/Ω/°C, 0-200°C input,
4-20mA output, upscale break detection.
Input Configuration
Two-, three- or four-wire sensor input connections.
Input Ranges
100 ohm Platinum RTD, alpha = 375-393,
385 (default), -50 to 850°C (-58 to 1562°F).
0 to 900 ohms linear resistance.
Programs in °C, °F, or ohmic integer values only.
Zero Adjust
RTD 3/4 wire: -50, -17.78, or 0°C (-58, 0, 32°F).
RTD 2 wire: 0°C (32°F) fixed.
RES: 0 or 100 ohms.
Full-Scale Adjust
RTD: up to 850°C (1562°F), 50°C (58°F) span minimum.
Resistance: up to 900 ohms, 8 ohm span minimum.
Excitation Current
0.5mA, nominal, each ± lead.
Lead-Wire Compensation
25 ohms per lead.
Lead Break (Sensor Burnout) Detection
Configurable for either upscale or downscale.
Input Filter Bandwidth
-3dB at 700Hz, typical, normal mode filter.
■ Output
Output Range
4 to 20mA DC.
Under-scale limit adjustable for 2.1 to 3.6mA, nominal.
Over-scale limit adjustable for 21 to 30mA, nominal.
Output Fault Limits (Sensor Fault)
0.4mA below selected under-scale threshold and
1.0mA above over-scale threshold, typical.
Output Compliance
R load = (V supply - 8.6V) / 0.020A.
R load = 0 to 750 ohms @ 24V DC.
Output Accuracy
Better than ±0.1% of span, typical for spans less than
500°C. Includes the effects of repeatability, terminal
point conformity, and linearization, but does not
include sensor error.
Ambient Temperature Effect
Better than ±0.008% per °C of input span or
±80ppm/°C, typical. Includes the combined effects of
zero and span drift over temperature.
Output Response Time (for step input change)
500µS, typical with 250 ohm load (to reach 98% of
final output value).
■ Environmental
Operating temperature
-40 to 80°C (-40° to 176°F).
Storage temperature
-40 to 85°C (-40 to 185°F).
Relative humidity
5 to 95% non-condensing.
Power Requirement
9-32V DC SELV (Safety Extra Low Voltage),
30mA max.
Shock and Vibration Immunity
Vibration: 5g, per IEC 60068-2-64.
Shock: 50g, per IEC 60068-2-27.
Electromagnetic Compatibility (EMC) Compliance
Radiated Emissions: BS EN 61000-6-4, CISPR 16.
RFI: BS EN 61000-6-2, IEC 61000-4-3.
Conducted RFI: BS EN 61000-6-2, IEC 61000-4-6.
ESD: BS EN 61000-6-2, IEC 61000-4-2.
EFT: BS EN 61000-6-2, IEC 61000-4-4.
Surge Immunity: BS EN 61000-6-2, IEC 61000-4-5.
Approvals
CE compliant. UL/cUL listing.
Designed for Class I; Division 2; Groups ABCD; Zone 2
■ Physical
General
General-purpose enclosure designed for mounting on
35mm “T-type” DIN rail.
Case Material
Self-extinguishing polyamide, UL94 V-0 rated, color
light gray. General-purpose NEMA Type 1 enclosure.
I/O Connectors
Removable plug-in terminal blocks rated for 12A/250V;
AWG #26-12, stranded or solid copper wire.
Dimensions
12.5 x 114.5 x 99.0 mm (0.5 x 4.51 x 3.90 inches).
Shipping Weight
0.22 kg (0.5 pounds) packed.
Ordering Information
Models
TT231-0600
Transmitter, RTD/resistance input.
Services
TT230-Config/Cal
Factory custom configuration/calibration service.
Specify input type, input/output zero and full-scale
values, filtering, and sensor fault settings on order.
Software
TTC-SIP (recommend one kit per customer)
Software Interface Package for Acromag TT Series
transmitters. Includes configuration software CD-ROM
(5040-944), isolator (USB-ISOLATOR) and two USB
cables (4001-112, 4001-113).
Accessories
See  for more information.
USB-ISOLATOR
USB-to-USB isolator, includes USB cable (4001-112).
IMPORTANT: To prevent damage or errors
from grounded PCs and surges, Acromag
strongly recommends use of their USB-ISOLATOR
when configuring a TT230 Series transmitter.
248-295-0880 ■ 248-624-9234 ■  ■  ■ 30765 

Wixom Rd, Wixom, MI 48393 USA
Transmitters: TT230 Series
Bulletin #8400-661e
Description
The TT233 model is a space-saving two-wire
transmitter that isolates and converts a millivolt
or thermocouple sensor input to a proportional
4-20mA control signal. Power is received from
the output loop current or a DC supply when
using a three-wire connection. The transmitter
performs thermocouple linearization, cold-
junction compensation, and lead-break detection.
High-voltage isolation separates the input from
the output circuit. Isolation protects from surges,
reduces noise, and eliminates ground loop errors.
Setup and calibration are fast and easy with
a convenient USB connection to your PC and
Acromag’s Windows configuration software.
Advanced signal processing capabilities, variable
range input, and convenient USB programming
make this instrument a very versatile temperature
measurement device. These transmitters can
withstand harsh industrial environments and
operate reliably across a wide temperature range
with very low drift. They feature RFI, EMI, ESD,
EFT, and surge protection plus low radiated
emissions.
Key Features & Benefits
■ Easy setup and digital calibration via USB with
Windows configuration software
■ Universal thermocouple or millivolt input
(TC Type J, K, T, R, S, E, B, N or ±100mV)
■ Space-saving 12.5mm (0.5 inch) unit with
pluggable terminals for convenient wiring
■ High accuracy, linearity, stability, and reliability
■ Low temperature drift (<80ppm/°C)
■ User-selectable filtering (none, low, med., high)
■ Supports sink or source output wiring
■ Supports reverse-acting (inverse) output
■ Selectable upscale or downscale operation for
sensor errors and lead-break detection
■ 1500V input isolation
■ NAMUR-compliant output loop current
■ Shock (25g) and vibration (4g) resistant
■ Mounts on Type T DIN-rail
■ Wide ambient operation (-40 to 80°C)
■ CE compliant. UL/cUL Class 1 Div 2 Zone 2
approvals
Universal thermocouple or ±100mV input ◆ 4-20mA output 

(sink/source) ◆ 12-32V DC loop/local power
TT233 Thermocouple/millivolt input two-wire/three-wire 

transmitter
G
+
–
THERMOCOUPLE
J, K, T, E, R, S, B, OR N
OR MILLIVOLT
BOTTOM VIEW
(INPUT SIDE)
2 1
4 3
3
1
2
S
4
+
–
6
5
I
I
+
RCV
P
DCS/PLC
SOURCING
INPUT CARD
24VDC
TOP VIEW
(OUTPUT SIDE)
+
–
6
5
6 5
7
8
8 7
R
I
+
–
LOAD
C
C
I
24V DC
LOCAL
SUPPLY
Local Power Supply w/ Sourced Output
Loop-Powered w/ Sinking Output
+
–
114.5 mm
(4.51 in.)
12.5 mm
(0.50 in.)
99.0 mm
(3.90 in.)
SIDE VIEW
OPTIONAL
SHIELD GROUND
INPUT +/–
SHIELDED
CABLE
OPTIONAL
EARTH
GROUND
+
–
SINKING
INPUT
CARD
TT230 Series Transmitter
Configuration Software is
downloadable (FREE) from
.
Windows XP, Vista, 7, & 8
USB
Configured
TT233 Model software allows you to configure transmitters 

offline, save the file, and
download settings into units later, at your convenience.
248-295-0880 ■ 248-624-9234 ■  ■  ■ 30765 

Wixom Rd, Wixom, MI 48393 USA
All trademarks are property of their respective owners. 

Copyright © Acromag, Inc. 2015. Data subject to change 

without notice. Printed in USA 5/2015
Transmitters: TT230 Series
TT233 Thermocouple input two-wire/three-wire transmitter
Performance Specifications
■ USB Interface
USB Connector
USB Mini-B type socket, 5-pin.
USB Data Rate
12Mbps. USB v1.1 and 2.0 compatible.
USB Transient Protection
Transient voltage suppression on power and data lines.
USB Cable Length
5.0 meters maximum.
Driver
Not required. Uses built-in Human Interface Device
(HID) USB drivers of the Windows operating system.
■ Input
Default Configuration/Calibration
Input: TC J, -210 to 760°C, high filter, Break: up
Output: 4 to 20mA.
Input Ranges and Accuracy
Input Range Accuracy
TC J
TC K
TC T
TC R
TC S
TC E
TC B
TC N
mV
-210 to 760°C (-346 to 1400°F)
-200 to 1372°C (-328 to 2502°F)
-260 to 400°C (-436 to 752°F)
-50 to 1768°C (-58 to 3214°F)
-50 to 1768°C (-58 to 3214°F)
-200 to 1000°C (-328 to 1832°F)
260 to 1820°C (500 to 3308°F)
-230 to 1300°C (-382 to 2372°F)
-100 to 100mV
±0.5°C
±0.5°C
±0.5°C
±1.0°C
±1.0°C
±0.5°C
±1.0°C
±1.0°C
±0.1mV
Error includes the effects of repeatability, terminal
point conformity, and linearization. Does not include
CJC error.
Thermocouple Reference
(Cold Junction Compensation)
±0.2°C typical, ±0.5°C maximum at 25°C.
Ambient Temperature Effect
Better than ±80ppm/°C (±0.008%/°C).
Zero Scaling Adjust
0 to 95% of range, typical.
Full Scale Adjust
5 to * of full scale range, typical.
Lead Break (Sensor Burnout) Detection
Configurable for either upscale (24mA) or downscale
(3.3mA) operation.
Input Over-Voltage Protection
Bipolar Transient Voltage Suppressers (TVS),
5.6V clamp level typical.
Resolution
Millivolt input: 0.0025% (1 part in 40,000)
Thermocouple input: 0.1°C.
Input Filter
Selectable digital filtering settings
(none, low, medium, high).
Input Filter Bandwidth
Normal mode plus digital filtering within the ADC.
Bandwidth (-3dB) varies with digital filter setting from
4Hz without filtering to 0.33Hz with high filtering.
Noise Rejection (Common Mode, High Filter)
155dB @ 60Hz, typical with 100 ohm input unbalance.
■ Output
Output Range
4 to 20mA DC.
Output Compliance
R load = (V supply - 11V) / 0.020A.
R load = 0 to 650 ohms @ 24V DC.
Output Response Time (for step input change)
Time to reach 98% of final output value (typical)
No filtering 104 milliseconds
Low filter 380 milliseconds
Medium filter 760 milliseconds
High filter 960 milliseconds
■ Environmental
Operating temperature
-40 to 80°C (-40° to 176°F).
Storage temperature
-40 to 85°C (-40 to 185°F).
Relative humidity
5 to 95% non-condensing.
Power Requirement
12-32V DC SELV (Safety Extra Low Voltage),
24mA max.
Isolation
1500V AC peak. 250V AC (354V DC) continuous
isolation between input and output circuits.
Shock and Vibration Immunity
Vibration: 5g, per IEC 60068-2-64.
Shock: 50g, per IEC 60068-2-27.
Electromagnetic Compatibility (EMC) Compliance
Radiated Emissions: BS EN 61000-6-4, CISPR 16.
RFI: BS EN 61000-6-2, IEC 61000-4-3.
Conducted RFI: BS EN 61000-6-2, IEC 61000-4-6.
ESD: BS EN 61000-6-2, IEC 61000-4-2.
EFT: BS EN 61000-6-2, IEC 61000-4-4.
Surge Immunity: BS EN 61000-6-2, IEC 61000-4-5.
Approvals
CE compliant. UL/cUL listing.
Designed for Class I; Division 2; Groups ABCD; Zone 2.
■ Physical
General
General-purpose enclosure designed for mounting on
35mm “T-type” DIN rail.
Case Material
Self-extinguishing polyamide, UL94 V-0 rated, color
light gray. General-purpose NEMA Type 1 enclosure.
I/O Connectors
Removable plug-in terminal blocks rated for 12A/250V;
AWG #26-12, stranded or solid copper wire.
Dimensions
12.5 x 114.5 x 99.0 mm (0.5 x 4.51 x 3.90 inches).
Shipping Weight
0.22 kg (0.5 pounds) packed.
Ordering Information
Models
TT233-0600
Transmitter, thermocouple/millivolt input.
Services
TT230-Config/Cal
Factory custom configuration/calibration service.
Specify input type, input/output zero and full-scale
values, filtering, and sensor fault settings on order.
Software
TTC-SIP (recommend one kit per customer)
Software Interface Package for Acromag TT Series
transmitters. Includes configuration software CD-ROM
(5040-944), isolator (USB-ISOLATOR) and two USB
cables (4001-112, 4001-113).
Accessories
See  for more information.
USB-ISOLATOR
USB-to-USB isolator, includes USB cable (4001-112).
IMPORTANT: To prevent damage or errors
from grounded PCs and surges, Acromag
strongly recommends use of their USB-ISOLATOR
when configuring a TT230 Series transmitter.
248-295-0880 ■ 248-624-9234 ■  ■  ■ 30765 

Wixom Rd, Wixom, MI 48393 USA
Transmitters: TT230 Series
Bulletin #8400-662b
Description
The TT234 model is a space-saving two-wire
transmitter that isolates and converts a resistive
sensor input to a proportional 4-20mA signal.
Power is received from the output loop current or
a DC supply when using a three-wire connection.
The transmitter provides sensor excitation plus
performs linearization, lead-wire compensation,
and lead-break detection.
Setup and calibration are fast and easy with
a convenient USB connection to your PC and
Acromag’s Windows configuration software.
Advanced signal processing capabilities, variable
range input, and convenient USB programming
make this instrument a very versatile temperature
measurement device. These transmitters can
withstand harsh industrial environments and
operate reliably across a wide temperature range
with very low drift. They feature RFI, EMI, ESD,
EFT, and surge protection plus low radiated
emissions.
Key Features & Benefits
■ Easy setup and digital calibration via USB with
Windows configuration software
■ Interfaces 100-100kΩ potentiometer/slidewire
and 100-1MΩ NTC thermistor/rheostat inputs
■ Customizable thermistor linearization table
with preset curves for popular resistances
■ 1500V isolation between input/output circuits
■ Space-saving 12.5mm (0.5 inch) unit with
pluggable terminals for convenient wiring
■ High accuracy, linearity, stability, and reliability
■ Supports normal or reverse-acting output
■ Supports sink or source output wiring
■ User-selectable filtering (none, low, med., high)
■ Fast response (as low as 11ms)
■ Selectable upscale or downscale operation for
sensor errors and lead-break detection
■ NAMUR-compliant output loop current
■ Shock (25g) and vibration (4g) resistant
■ Wide ambient operation (-40 to 80°C)
■ CE and UL/cUL Class 1 Div 2 Zone 2 approvals
Potentiometer/slidewire, thermistor input ◆ 4-20mA output 

(sink/source) ◆ 12-32V DC loop/local power
TT234 Potentiometer / thermistor input two-wire 

transmitter
+
–
6
5
I
I
+
RCV
P
DCS/PLC
SOURCING
INPUT CARD
24VDC
TOP VIEW
(OUTPUT SIDE)
+
–
6
5
6 5
7
8
8 7
R
I
+
–
LOAD
C
C
I
24V DC
LOCAL
SUPPLY
Local Power Supply w/ Sourced Output
Loop-Powered w/ Sinking Output
+
–
+
–
SINKING
INPUT
CARD
BOTTOM VIEW
(INPUT SIDE)
2 1
4 3
114.5 mm
(4.51 in.)
12.5 mm
(0.50 in.)
99.0 mm
(3.90 in.)
SIDE VIEW
W
H
1
2
3
4
THERMISTOR RHEOSTAT POT/SLIDEWIRE
–
+
– –
+
Resistance Input
MAX
MIN
TT230 Series Transmitter
Configuration Software is
downloadable (FREE) from
.
Windows XP, Vista, 7, & 8
USB
Configured
TT234 Model software allows you to configure transmitters 

offline,
save the file, and download into units later, at your 

convenience.
The Agility™ Config Tool
is downloadable (FREE) at
the Google Play Store
For Android Devices only
248-295-0880 ■ 248-624-9234 ■  ■  ■ 30765 

Wixom Rd, Wixom, MI 48393 USA
All trademarks are property of their respective owners. 

Copyright © Acromag, Inc. 2013. Data subject to change 

without notice. Printed in USA 8/2013
Transmitters: TT230 Series
TT234 Potentiometer / thermistor input two-wire 

transmitter
Performance Specifications
■ USB Interface
USB Connector
USB Mini-B type socket, 5-pin.
USB Data Rate
12Mbps. USB v1.1 and 2.0 compatible.
USB Transient Protection
Transient voltage suppression on power and data lines.
USB Cable Length
5.0 meters maximum.
Driver
Not required. Uses built-in Human Interface Device
(HID) USB drivers of the Windows operating system.
■ Input
Default Configuration
Pot/slidewire, 0% to * input, 4-20mA output,
downscale break detect, medium filter.
Input Configuration
Two- or three-wire sensor input connections.
User-configurable thermistor linearization table has
preset curves for resistances below at 25°C.
Programs in °C, °F, °K, or ohmic integer values only.
Input Ranges
Input Type Input Range Accuracy
Potentiometer
Rheostat
Thermistor 2252Ω
Thermistor 2752Ω
Thermistor 2795Ω
Thermistor 3kΩ
Thermistor 5kΩ
Thermistor 10kΩ
Thermistor 30kΩ
Custom thermistor
0 to *
(100 to 100KΩ)
100 to 1MΩ
-40 to 100°C
(-40 to 212°F)
-40 to 100°C
-40 to 100°C
-40 to 100°C
-40 to 100°C
-40 to 100°C
-40 to 100°C
100 to 1MΩ
< ±0.01% of span
< ±0.5% of input
< ±0.05°C
(±0.09°F)
< ±0.05°C (±0.09°F)
< ±0.05°C (±0.09°F)
< ±0.05°C (±0.09°F)
< ±0.05°C (±0.09°F)
< ±0.05°C (±0.09°F)
< ±0.05°C (±0.09°F)
< ±0.5% of input
Input Scaling Adjust
Zero: 0 to 95% of range, typical.
Full scale: 5 to * of full scale range, typical.
Excitation Voltage
Thermistor/rheostat: 1.25V DC, typical.
Potentiometer: 0.3V DC, limited to 3.35mA, typical.
Lead Break (Sensor Burnout) Detection
Configurable for either upscale or downscale on
thermistor or rheostat inputs. Downscale only on
potentiometer/slidewire inputs.
■ Output
Output Range
4 to 20mA DC.
Under-range capability 3.5mA.
Over-range capability 24mA.
Output Compliance
R load = (V supply - 11V) / 0.020A.
R load = 0 to 650 ohms @ 24V DC.
Output DAC Resolution
16-bit D/A converter
Output Accuracy
Better than ±0.05% of span, typical (±0.1% max.)
for for nominal input spans. Includes the effects
of repeatability, terminal point conformity, and
linearization, but does not include sensor error.
Ambient Temperature Effect
Better than ±0.008% per °C of input span or
±80ppm/°C, typical. Includes the combined effects of
zero and span drift over temperature.
Output Response Time (for step input change)
No filter: 11ms.  Medium filter: 150ms.
Low filter: 40ms.  High filter: 1200ms.
■ Environmental
Operating temperature
-40 to 80°C (-40° to 176°F).
Storage temperature
-40 to 85°C (-40 to 185°F).
Relative humidity
5 to 95% non-condensing.
Power Requirement
12-32V DC SELV (Safety Extra Low Voltage),
24mA maximum.
Shock and Vibration Immunity
Vibration: 4g, per IEC 60068-2-64.
Shock: 25g, per IEC 60068-2-27.
Electromagnetic Compatibility (EMC) Compliance
Radiated Emissions: BS EN 61000-6-4, CISPR 16.
RFI: BS EN 61000-6-2, IEC 61000-4-3.
Conducted RFI: BS EN 61000-6-2, IEC 61000-4-6.
ESD: BS EN 61000-6-2, IEC 61000-4-2.
EFT: BS EN 61000-6-2, IEC 61000-4-4.
Surge Immunity: BS EN 61000-6-2, IEC 61000-4-5.
Approvals
CE compliant. UL/cUL Class I Div. 2 Zone 2.
■ Physical
General
General-purpose enclosure designed for mounting on
35mm “T-type” DIN rail.
Case Material
Self-extinguishing polyamide, UL94 V-0 rated, color
light gray. General-purpose NEMA Type 1 enclosure.
I/O Connectors
Removable plug-in terminal blocks rated for 12A/250V;
AWG #26-12, stranded or solid copper wire.
Dimensions
12.5 x 114.5 x 99.0 mm (0.5 x 4.51 x 3.90 inches).
Shipping Weight
0.22 kg (0.5 pounds) packed.
Ordering Information
Models
TT234-0600
Transmitter, potentiometer/thermistor input
Services
TT230-Config/Cal
Factory custom configuration/calibration service.
Specify input type, input/output zero and full-scale
values, filtering, and sensor fault settings on order.
Software
TTC-SIP (recommend one kit per customer)
Software Interface Package for Acromag TT Series
transmitters. Includes configuration software CD-ROM
(5040-944), isolator (USB-ISOLATOR) and two USB
cables (4001-112, 4001-113).
Accessories
See  for more information.
USB-ISOLATOR
USB-to-USB isolator, includes USB cable (4001-112).
IMPORTANT: To prevent damage or errors
from grounded PCs and surges, Acromag
strongly recommends use of their USB-ISOLATOR
when configuring a TT230 Series transmitter.
248-295-0880 ■ 248-624-9234 ■  ■  ■ 30765 

Wixom Rd, Wixom, MI 48393 USA
Transmitters: TT230 Series
Bulletin #8400-755b
Description
The TT235 model is a space-saving two-wire
transmitter that isolates and converts an RTD
sensor input to a proportional 4-20mA signal.
Power is received from the output loop current or
a DC supply when using a three-wire connection.
The transmitter provides sensor excitation plus
performs linearization, lead-wire compensation,
and lead-break detection.
Setup and calibration are fast and easy with
a convenient USB connection to your PC and
Acromag’s Windows configuration software.
Advanced signal processing capabilities, variable
range input, and convenient USB programming
make this instrument a very versatile temperature
measurement device. These transmitters can
withstand harsh industrial environments and
operate reliably across a wide temperature range
with very low drift. They feature RFI, EMI, ESD,
EFT, and surge protection plus low radiated
emissions.
Key Features & Benefits
■ Easy setup and digital calibration via USB with
Windows configuration software
■ Selectable RTD or linear resistance input type:
Pt RTD (100Ω, 200Ω, 500Ω, or 1000Ω),
Ni RTD (120Ω), Cu RTD (10Ω), or
Resistance (0-450Ω)
■ 1500V isolation between input/output circuits
■ Space-saving 12.5mm (0.5 inch) unit with
pluggable terminals for convenient wiring
■ High accuracy, linearity, stability, and reliability
■ Supports normal or reverse-acting output
■ Supports sink or source output wiring
■ User-selectable filtering (none, low, med., high)
■ Fast response (as low as 22ms)
■ Selectable upscale or downscale operation for
sensor errors and lead-break detection
■ NAMUR-compliant output loop current
■ Shock (25g) and vibration (4g) resistant
■ Wide ambient operation (-40 to 80°C)
■ CE and UL/cUL Class 1 Div 2 Zone 2 approvals
RTD (Pt, Ni, Cu) or 0-450 ohm input ◆ 4-20mA output 

(sink/source) ◆ 12-32V DC loop/local power
TT235 Isolated RTD/resistance input two-wire transmitter
+
–
6
5
I
I
+
RCV
P
DCS/PLC
SOURCING
INPUT CARD
24VDC
TOP VIEW
(OUTPUT SIDE)
+
–
6
5
6 5
7
8
8 7
R
I
+
–
LOAD
C
C
I
24V DC
LOCAL
SUPPLY
Local Power Supply w/ Sourced Output
Loop-Powered w/ Sinking Output
+
–
+
–
SINKING
INPUT
CARD
BOTTOM VIEW
(INPUT SIDE)
114.5 mm
(4.51 in.)
12.5 mm
(0.50 in.)
99.0 mm
(3.90 in.)
SIDE VIEW
RTD Sensor or Resistance Input
2 1
4 3
1
2-WIRE 3-WIRE 4-WIRE
2
4
3
2
4
1
3
2
4
1
3
TT230 Series Transmitter
Configuration Software is
downloadable (FREE) from
.
Windows XP, Vista, 7, & 8
USB
Configured
TT235 Model software allows you to configure transmitters 

offline,
save the file, and download into units later, at your 

convenience.
The Agility™ Config Tool
is downloadable (FREE) at
the Google Play Store
For Android Devices only
248-295-0880 ■ 248-624-9234 ■  ■  ■ 30765 

Wixom Rd, Wixom, MI 48393 USA
All trademarks are property of their respective owners. 

Copyright © Acromag, Inc. 2013. Data subject to change 

without notice. Printed in USA 8/2013
Transmitters: TT230 Series
TT235 Isolated RTD/resistance input two-wire transmitter
Performance Specifications
■ USB Interface
USB Connector
USB Mini-B type socket, 5-pin.
USB Data Rate
12Mbps. USB v1.1 and 2.0 compatible.
USB Transient Protection
Transient voltage suppression on power and data lines.
USB Cable Length
5.0 meters maximum.
Driver
Not required. Uses built-in Human Interface Device
(HID) USB drivers of the Windows operating system.
■ Input
Default Configuration
100Ω Pt RTD, α=0.00385, -200 to 850°C input,
4-20mA output, upscale break detect, medium filter.
Input Configuration
Two-, three- or four-wire sensor input connections.
Programs in °C, °K, °F, or ohmic integer values only.
Input Ranges
Input Type Input Range Accuracy 2
RTD, Pt 100Ω
RTD, Pt 200Ω
RTD, Pt 500Ω
RTD, Pt 1000Ω
RTD, Ni 120Ω
(Minco 7-120)
RTD, Cu 10Ω
(Minco 16-9)
Resistance (linear) 1
-200 to 850°C
(-328 to 1562°F)
-200 to 850°C
-200 to 850°C
-200 to 850°C
-80 to 320°C
(-112 to 608°F)
-200 to 270°C
(-328 to 518°F)
0 to 450Ω
±0.2°C, ±0.019%
±0.3°C, ±0.029%
±0.5°C, ±0.048%
±1.0°C, ±0.095%
±0.08°C, ±0.020%
±0.5°C, ±0.106%
±0.05Ω, ±0.010%
Note 1: Linear resistance input range approaches but
does not include 0Ω and 500Ω. If exactly 0Ω or 500Ω
is measured, break detection is triggered.
Note 2: Rated accuracy (in °C and % of span) applies
for input spans greater than 5% of input full-scale.
Input Scaling Adjust
Zero: 0 to 95% of range, typical.
Full scale: 5 to * of full scale range, typical.
Lead Break (Sensor Burnout) Detection
Configurable for either upscale or downscale.
■ Output
Output Range
4 to 20mA DC.
Under-range capability 3.5mA.
Over-range capability 24mA.
Output Compliance
R load = (V supply - 11V) / 0.020A.
R load = 0 to 650 ohms @ 24V DC.
Output DAC Resolution
16-bit D/A converter
Output Accuracy
Better than ±0.05% of span, typical (±0.1% max.)
for for nominal input spans. Includes the effects
of repeatability, terminal point conformity, and
linearization, but does not include sensor error.
Ambient Temperature Effect
Better than ±0.008% per °C of input span or
±80ppm/°C, typical. Includes the combined effects of
zero and span drift over temperature.
Output Response Time (for step input change)
No filter: 22ms.
Low filter: 50ms.
Medium filter: 160ms.
High filter: 1210ms.
■ Environmental
Operating temperature
-40 to 80°C (-40° to 176°F).
Storage temperature
-40 to 85°C (-40 to 185°F).
Relative humidity
5 to 95% non-condensing.
Power Requirement
12-32V DC SELV (Safety Extra Low Voltage),
24mA maximum.
Shock and Vibration Immunity
Vibration: 4g, per IEC 60068-2-64.
Shock: 25g, per IEC 60068-2-27.
Electromagnetic Compatibility (EMC) Compliance
Radiated Emissions: BS EN 61000-6-4, CISPR 16.
RFI: BS EN 61000-6-2, IEC 61000-4-3.
Conducted RFI: BS EN 61000-6-2, IEC 61000-4-6.
ESD: BS EN 61000-6-2, IEC 61000-4-2.
EFT: BS EN 61000-6-2, IEC 61000-4-4.
Surge Immunity: BS EN 61000-6-2, IEC 61000-4-5.
Approvals
CE compliant. UL/cUL Class I Div. 2 Zone 2.
■ Physical
General
General-purpose enclosure designed for mounting on
35mm “T-type” DIN rail.
Case Material
Self-extinguishing polyamide, UL94 V-0 rated, color
light gray. General-purpose NEMA Type 1 enclosure.
I/O Connectors
Removable plug-in terminal blocks rated for 12A/250V;
AWG #26-12, stranded or solid copper wire.
Dimensions
12.5 x 114.5 x 99.0 mm (0.5 x 4.51 x 3.90 inches).
Shipping Weight
0.22 kg (0.5 pounds) packed.
Ordering Information
Models
TT235-0600
Transmitter, isolated RTD/resistance input.
Services
TT230-Config/Cal
Factory custom configuration/calibration service.
Specify input type, input/output zero and full-scale
values, filtering, and sensor fault settings on order.
Software
TTC-SIP (recommend one kit per customer)
Software Interface Package for Acromag TT Series
transmitters. Includes configuration software CD-ROM
(5040-944), isolator (USB-ISOLATOR) and two USB
cables (4001-112, 4001-113).
Accessories
See  for more information.
USB-ISOLATOR
USB-to-USB isolator, includes USB cable (4001-112).
IMPORTANT: To prevent damage or errors
from grounded PCs and surges, Acromag
strongly recommends use of their USB-ISOLATOR
when configuring a TT230 Series transmitter.
248-295-0880 ■ 248-624-9234 ■  ■  ■ 30765 

Wixom Rd, Wixom, MI 48393 USA
Transmitters: TT230 Series
Bulletin #8400-663f
Description
The TT236 model is a space-saving two-wire
transmitter that isolates and converts a DC
current or low voltage input to a proportional
4-20mA control signal. A single unit supports
both voltage and current input for extra flexibility.
Power is received from the output loop current or
a DC supply when using a three-wire connection.
High-voltage isolation separates the input from
the output circuit. Isolation protects from surges,
reduces noise, and eliminates ground loop errors.
Setup and calibration are fast and easy with
a convenient USB connection to your PC and
Acromag’s Windows configuration software.
Advanced signal processing capabilities, variable
range input, and convenient USB programming
make this instrument a very versatile temperature
measurement device. These transmitters can
withstand harsh industrial environments and
operate reliably across a wide temperature range
with very low drift. They feature RFI, EMI, ESD,
EFT, and surge protection plus low radiated
emissions.
Key Features & Benefits
■ Easy setup and digital calibration via USB with
Windows configuration software
■ Single unit supports unipolar and bipolar input
ranges up to ±20mA or ±500mV DC
■ Accepts 0-20A AC input (with external sensor)
■ Space-saving 12.5mm (0.5 inch) unit with
pluggable terminals for convenient wiring
■ High accuracy, linearity, stability, and reliability
■ User-selectable filtering (low, medium, high)
■ Supports sink or source output wiring
■ Supports reverse-acting (inverse) output
■ 1500V input isolation
■ NAMUR-compliant output loop current
■ Shock (25g) and vibration (4g) resistant
■ Mounts on Type T DIN-rail
■ Wide ambient operation (-40 to 80°C)
■ CE compliant. UL/cUL Class 1 Div 2 Zone 2
approvals
Multi-range ±20mA or ±500mV input ◆ 4-20mA output 

(sink/source) ◆ 12-32V DC loop/local power
TT236 Current/millivolt input two-wire/three-wire 

transmitter
BOTTOM VIEW
(INPUT SIDE)
2 1
4 3
+
–
6
5
I
I
+
RCV
P
DCS/PLC
SOURCING
INPUT CARD
24VDC
TOP VIEW
(OUTPUT SIDE)
+
–
6
5
6 5
7
8
8 7
R
I
+
–
LOAD
C
C
I
24V DC
LOCAL
SUPPLY
Local Power Supply w/ Sourced Output
Loop-Powered w/ Sinking Output
+
–
114.5 mm
(4.51 in.)
12.5 mm
(0.50 in.)
99.0 mm
(3.90 in.)
SIDE VIEW
+
–
SINKING
INPUT
CARD
INPUT
INPUT
1
2
3
4
TB1
TB2
CURRENT
(mA DC)
I
VOLTAGE
(V DC)
V V
SHIELDED
CABLE
SHIELDED
CABLE
+
–
+
–
+
–
OPTIONAL
SHIELD
GROUND
USB
Configured
TT230 Series Transmitter
Configuration Software
is downloadable (FREE)
from .
Windows XP, Vista, 7, & 8
TT236 Model software allows you to configure transmitters 

offline,
save the file, and download into units later, at your 

convenience.
The Agility™ Config Tool
is downloadable (FREE) at
the Google Play Store
For Android Devices only
248-295-0880 ■ 248-624-9234 ■  ■  ■ 30765 

Wixom Rd, Wixom, MI 48393 USA
All trademarks are property of their respective owners. 

Copyright © Acromag, Inc. 2015. Data subject to change 

without notice. Printed in USA 5/2015
Transmitters: TT230 Series
TT236 Current/millivolt input two-wire/three-wire 

transmitter
Performance Specifications
■ USB Interface
USB Connector
USB Mini-B type socket, 5-pin.
USB Data Rate
12Mbps. USB v1.1 and 2.0 compatible.
USB Transient Protection
Transient voltage suppression on power and data lines.
USB Cable Length
5.0 meters maximum.
Driver
Not required. Uses built-in Human Interface Device
(HID) USB drivers of the Windows operating system.
■ Input
Default Configuration/Calibration
Input: 4 to 20mA, medium filter.
Output: 4 to 20mA.
Input Ranges and Accuracy
Range Accuracy
±500mV
0 to 500mV
±20mA
0 to 20mA
4 to 20mA
0 to 11.17mA (for AC sensor)
±1mA
±0.05% of span
±0.05% of span
±0.05% of span
±0.05% of span
±0.05% of span
±0.05% of span
±0.05% of span
Error includes the effects of repeatability, terminal
point conformity, and linearization.
Ambient Temperature Effect
Better than ±80ppm/°C (±0.008%/°C).
Zero Scaling Adjust
0 to 95% of range, typical.
Full Scale Adjust
5 to * of full scale range, typical.
Input Impedance
Current input: 24.9 ohms.
Voltage input: 15M ohms
Input Over-Voltage Protection
Bipolar Transient Voltage Suppressers (TVS),
5.6V clamp level typical.
Input Resolution
Bipolar input: 1 part in 50000 (±25000)
Unipolar input: 1 part in 25000
Input Filter
Selectable digital filtering settings
(low, medium, high).
Input Filter Bandwidth
Normal mode plus digital filtering within the ADC.
Bandwidth (-3dB) varies with digital filter setting from
4Hz without filtering to 0.33Hz with high filtering.
Noise Rejection (Common Mode, High Filter)
138dB @ 60Hz, typical with 100 ohm input unbalance.
■ Output
Output Range
4 to 20mA DC.
Output Compliance
R load = (V supply - 11V) / 0.020A.
R load = 0 to 650 ohms @ 24V DC.
Output Response Time (for step input change)
Time to reach 98% of final output value (typical)
Low filter 50 milliseconds
Medium filter 150 milliseconds
High filter 1200 milliseconds
■ Environmental
Operating temperature
-40 to 80°C (-40° to 176°F).
Storage temperature
-40 to 85°C (-40 to 185°F).
Relative humidity
5 to 95% non-condensing.
Power Requirement
12-32V DC SELV (Safety Extra Low Voltage),
24mA max.
Isolation
1500V AC peak. 250V AC (354V DC) continuous
isolation between input and output circuits.
Shock and Vibration Immunity
Vibration: 5g, per IEC 60068-2-64.
Shock: 50g, per IEC 60068-2-27.
Electromagnetic Compatibility (EMC) Compliance
Radiated Emissions: BS EN 61000-6-4, CISPR 16.
RFI: BS EN 61000-6-2, IEC 61000-4-3.
Conducted RFI: BS EN 61000-6-2, IEC 61000-4-6.
ESD: BS EN 61000-6-2, IEC 61000-4-2.
EFT: BS EN 61000-6-2, IEC 61000-4-4.
Surge Immunity: BS EN 61000-6-2, IEC 61000-4-5.
Approvals
CE compliant. UL/cUL listing.
Designed for Class I; Division 2; Groups ABCD; Zone 2.
■ Physical
General
General-purpose enclosure designed for mounting on
35mm “T-type” DIN rail.
Case Material
Self-extinguishing polyamide, UL94 V-0 rated, color
light gray. General-purpose NEMA Type 1 enclosure.
I/O Connectors
Removable plug-in terminal blocks rated for 12A/250V;
AWG #26-12, stranded or solid copper wire.
Dimensions
12.5 x 114.5 x 99.0 mm (0.5 x 4.51 x 3.90 inches).
Shipping Weight
0.22 kg (0.5 pounds) packed.
Ordering Information
Models
TT236-0600
Two-wire transmitter, current/millivolt input.
Services
TT230-Config/Cal
Factory custom configuration/calibration service.
Specify input type, input/output zero and full-scale
values, filtering, and sensor fault settings on order.
Software
TTC-SIP (recommend one kit per customer)
Software Interface Package for Acromag TT Series
transmitters. Includes configuration software CD-ROM
(5040-944), isolator (USB-ISOLATOR) and two USB
cables (4001-112, 4001-113).
Accessories
See  for more information.
USB-ISOLATOR
USB-to-USB isolator, includes USB cable (4001-112).
5020-350
AC current sensor (toroidal transformer);
converts 0-20A AC to 0-11.17mA DC.
IMPORTANT: To prevent damage or errors
from grounded PCs and surges, Acromag
strongly recommends use of their USB-ISOLATOR
when configuring a TT230 Series transmitter.
248-295-0880 ■ 248-624-9234 ■  ■  ■ 30765 

Wixom Rd, Wixom, MI 48393 USA
Transmitters: TT230 Series
Bulletin #8400-664h
Description
The TT237 model is a space-saving two-wire
transmitter that isolates and converts a process
level DC voltage input to a proportional 4-20mA
control signal. A single unit supports multiple
voltage input ranges for extra flexibility. Power is
received from the output loop current or a local
DC supply when using a three-wire connection.
High-voltage isolation separates the input from
the output circuit. Isolation protects from surges,
reduces noise, and eliminates ground loop errors.
Setup and calibration are fast and easy with
a convenient USB connection to your PC and
Acromag’s Windows configuration software.
Advanced signal processing capabilities, variable
range input, and convenient USB programming
make this instrument a very versatile temperature
measurement device. These transmitters can
withstand harsh industrial environments and
operate reliably across a wide temperature range
with very low drift. They feature RFI, EMI, ESD,
EFT, and surge protection plus low radiated
emissions.
Key Features & Benefits
■ Easy setup and digital calibration via USB with
Windows configuration software
■ Single unit supports ±1V, ±5V, and ±10V DC
input ranges
■ Space-saving 12.5mm (0.5 inch) unit with
pluggable terminals for convenient wiring
■ High accuracy, linearity, stability, and reliability
■ User-selectable filtering (low, medium, high)
■ Supports sink or source output wiring
■ Supports reverse-acting (inverse) output
■ 1500V input isolation
■ NAMUR-compliant output loop current
■ Shock (25g) and vibration (4g) resistant
■ Mounts on Type T DIN-rail
■ Wide ambient operation (-40 to 80°C)
■ CE compliant. UL/cUL Class 1 Div 2 Zone 2
approvals
Multi-range ±1V, ±5V, or ±10V input ◆ 4-20mA output 

(sink/source) ◆ 12-32V DC loop/local power
TT237 Process voltage input two-wire/three-wire 

transmitter
BOTTOM VIEW
(INPUT SIDE)
2 1
4 3
+
–
6
5
I
I
+
RCV
P
DCS/PLC
SOURCING
INPUT CARD
24VDC
TOP VIEW
(OUTPUT SIDE)
+
–
6
5
6 5
7
8
8 7
R
I
+
–
LOAD
C
C
I
24V DC
LOCAL
SUPPLY
Local Power Supply w/ Sourced Output
Loop-Powered w/ Sinking Output
+
–
114.5 mm
(4.51 in.)
12.5 mm
(0.50 in.)
99.0 mm
(3.90 in.)
SIDE VIEW
+
–
SINKING
INPUT
CARD
INPUT
INPUT
1
2
3
4
TB1
TB2
VOLTAGE
(±1V DC)
VOLTAGE
(±5V DC,
±10V DC)
V V
V
SHIELDED
CABLE
SHIELDED
CABLE
+
–
+
–
+
–
OPTIONAL
SHIELD
GROUND
USB
Configured
TT230 Series Transmitter
Configuration Software is
downloadable (FREE) from

Windows XP, Vista, 7, & 8.
TT237 Model software allows you to configure transmitters 

offline,
save the file, and download into units later, at your 

convenience.
The Agility™ Config Tool
is downloadable (FREE) at
the Google Play Store
For Android Devices only
248-295-0880 ■ 248-624-9234 ■  ■  ■ 30765 

Wixom Rd, Wixom, MI 48393 USA
All trademarks are property of their respective owners. 

Copyright © Acromag, Inc. 2015. Data subject to change 

without notice. Printed in USA 5/2015
Transmitters: TT230 Series
TT237 Process voltage input two-wire/three-wire 

transmitter
Performance Specifications
■ USB Interface
USB Connector
USB Mini-B type socket, 5-pin.
USB Data Rate
12Mbps. USB v1.1 and 2.0 compatible.
USB Transient Protection
Transient voltage suppression on power and data lines.
USB Cable Length
5.0 meters maximum.
Driver
Not required. Uses built-in Human Interface Device
(HID) USB drivers of the Windows operating system.
■ Input
Default Configuration/Calibration
Input: ±10V DC, medium filtering.
Output: 4 to 20mA.
Input Ranges and Accuracy
Range Accuracy
±1V DC
±5V DC
±10V DC
±0.05% of span
±0.05% of span
±0.05% of span
Error includes the effects of repeatability, terminal
point conformity, and linearization.
Ambient Temperature Effect
Better than ±80ppm/°C (±0.008%/°C).
Zero Scaling Adjust
0 to 95% of range, typical.
Full Scale Adjust
5 to * of full scale range, typical.
Input Impedance
±1V input: 15M ohms.
±5V input: >1M ohms.
±10V input: >1M ohms.
Input Over-Voltage Protection
Bipolar Transient Voltage Suppressers (TVS),
14V working and 18V clamp level typical.
Input Resolution
Bipolar input: 1 part in 50000 (±25000)
Unipolar input: 1 part in 25000
Input Filter
Selectable digital filtering settings
(low, medium, high).
Input Filter Bandwidth
Normal mode plus digital filtering within the ADC.
Bandwidth (-3dB) varies with digital filter setting from
4Hz without filtering to 0.33Hz with high filtering.
Noise Rejection (Common Mode, High Filter)
138dB @ 60Hz, typical with 100 ohm input unbalance.
■ Output
Output Range
4 to 20mA DC.
Output Compliance
R load = (V supply - 11V) / 0.020A.
R load = 0 to 650 ohms @ 24V DC.
Output Response Time (for step input change)
Time to reach 98% of final output value (typical)
Low filter 50 milliseconds
Medium filter 150 milliseconds
High filter 1200 milliseconds
■ Environmental
Operating temperature
-40 to 80°C (-40° to 176°F).
Storage temperature
-40 to 85°C (-40 to 185°F).
Relative humidity
5 to 95% non-condensing.
Power Requirement
12-32V DC SELV (Safety Extra Low Voltage),
24mA max.
Isolation
1500V AC peak. 250V AC (354V DC) continuous
isolation between input and output circuits.
Shock and Vibration Immunity
Vibration: 5g, per IEC 60068-2-64.
Shock: 50g, per IEC 60068-2-27.
Electromagnetic Compatibility (EMC) Compliance
Radiated Emissions: BS EN 61000-6-4, CISPR 16.
RFI: BS EN 61000-6-2, IEC 61000-4-3.
Conducted RFI: BS EN 61000-6-2, IEC 61000-4-6.
ESD: BS EN 61000-6-2, IEC 61000-4-2.
EFT: BS EN 61000-6-2, IEC 61000-4-4.
Surge Immunity: BS EN 61000-6-2, IEC 61000-4-5.
Approvals
CE compliant. UL/cUL listing.
Designed for Class I; Division 2; Groups ABCD; Zone 2.
■ Physical
General
General-purpose enclosure designed for mounting on
35mm “T-type” DIN rail.
Case Material
Self-extinguishing polyamide, UL94 V-0 rated, color
light gray. General-purpose NEMA Type 1 enclosure.
I/O Connectors
Removable plug-in terminal blocks rated for 12A/250V;
AWG #26-12, stranded or solid copper wire.
Dimensions
12.5 x 114.5 x 99.0 mm (0.5 x 4.51 x 3.90 inches).
Shipping Weight
0.22 kg (0.5 pounds) packed.
Ordering Information
Models
TT237-0600
Two-wire transmitter, process voltage input.
Services
TT230-Config/Cal
Factory custom configuration/calibration service.
Specify input type, input/output zero and full-scale
values, filtering, and sensor fault settings on order.
Software
TTC-SIP (recommend one kit per customer)
Software Interface Package for Acromag TT Series
transmitters. Includes configuration software CD-ROM
(5040-944), isolator (USB-ISOLATOR) and two USB
cables (4001-112, 4001-113).
Accessories
See  for more information.
USB-ISOLATOR
USB-to-USB isolator, includes USB cable (4001-112).
IMPORTANT: To prevent damage or errors
from grounded PCs and surges, Acromag
strongly recommends use of their USB-ISOLATOR
when configuring a TT230 Series transmitter.
248-295-0880 ■ 248-624-9234 ■  ■  ■ 30765 

Wixom Rd, Wixom, MI 48393 USA
Transmitters: TT230 Series
Bulletin #8400-665f
Description
The TT238 model is a space-saving two-wire
transmitter that isolates and converts a high
level DC voltage input to a proportional 4-20mA
control signal. A single unit supports multiple
voltage input ranges for extra flexibility. Power is
received from the output loop current or a local
DC supply when using a three-wire connection.
High-voltage isolation separates the input from
the output circuit. Isolation protects from surges,
reduces noise, and eliminates ground loop errors.
Setup and calibration are fast and easy with
a convenient USB connection to your PC and
Acromag’s Windows configuration software.
Advanced signal processing capabilities, variable
range input, and convenient USB programming
make this instrument a very versatile temperature
measurement device. These transmitters can
withstand harsh industrial environments and
operate reliably across a wide temperature range
with very low drift. They feature RFI, EMI, ESD,
EFT, and surge protection plus low radiated
emissions.
Key Features & Benefits
■ Easy setup and digital calibration via USB with
Windows configuration software
■ Single unit supports ±15V, ±75V, and ±150V
DC input ranges
■ Space-saving 12.5mm (0.5 inch) unit with
pluggable terminals for convenient wiring
■ High accuracy, linearity, stability, and reliability
■ User-selectable filtering (low, medium, high)
■ Supports sink or source output wiring
■ Supports reverse-acting (inverse) output
■ 1500V input isolation
■ NAMUR-compliant output loop current
■ Shock (25g) and vibration (4g) resistant
■ Mounts on Type T DIN-rail
■ Wide ambient operation (-40 to 80°C)
■ CE compliant. UL/cUL Class 1 Div 2 Zone 2
approvals
Multi-range ±15V, ±75V, or ±150V input ◆ 4-20mA output 

(sink/source) ◆ 12-32V DC loop/local power
TT238 High voltage input two-wire/three-wire transmitter
BOTTOM VIEW
(INPUT SIDE)
2 1
4 3
+
–
6
5
I
I
+
RCV
P
DCS/PLC
SOURCING
INPUT CARD
24VDC
TOP VIEW
(OUTPUT SIDE)
+
–
6
5
6 5
7
8
8 7
R
I
+
–
LOAD
C
C
I
24V DC
LOCAL
SUPPLY
Local Power Supply w/ Sourced Output
Loop-Powered w/ Sinking Output
+
–
114.5 mm
(4.51 in.)
12.5 mm
(0.50 in.)
99.0 mm
(3.90 in.)
SIDE VIEW
+
–
SINKING
INPUT
CARD
INPUT
INPUT
1
2
3
4
TB1
TB2
VOLTAGE
(±15V DC)
VOLTAGE
(±75V DC,
±150V DC)
V V
V
SHIELDED
CABLE
SHIELDED
CABLE
+
–
+
–
+
–
OPTIONAL
SHIELD
GROUND
USB
Configured
TT230 Series Transmitter
Configuration Software is
downloadable (FREE) from
.
Windows XP, Vista, 7, & 8
TT238 Model software allows you to configure transmitters 

offline,
save the file, and download into units later, at your 

convenience.
The Agility™ Config Tool
is downloadable (FREE) at
the Google Play Store
For Android Devices only
248-295-0880 ■ 248-624-9234 ■  ■  ■ 30765 

Wixom Rd, Wixom, MI 48393 USA
All trademarks are property of their respective owners. 

Copyright © Acromag, Inc. 2015. Data subject to change 

without notice. Printed in USA 5/2015
Transmitters: TT230 Series
TT238 High voltage input two-wire/three-wire transmitter
Performance Specifications
■ USB Interface
USB Connector
USB Mini-B type socket, 5-pin.
USB Data Rate
12Mbps. USB v1.1 and 2.0 compatible.
USB Transient Protection
Transient voltage suppression on power and data lines.
USB Cable Length
5.0 meters maximum.
Driver
Not required. Uses built-in Human Interface Device
(HID) USB drivers of the Windows operating system.
■ Input
Default Configuration/Calibration
Input: ±150V, medium filtering.
Output: 4 to 20mA.
Input Ranges and Accuracy
Range Accuracy
±15V DC
±75V DC
±150V DC
±0.05% of span
±0.05% of span
±0.05% of span
Error includes the effects of repeatability, terminal
point conformity, and linearization.
Ambient Temperature Effect
Better than ±80ppm/°C (±0.008%/°C).
Zero Scaling Adjust
0 to 95% of range, typical.
Full Scale Adjust
5 to * of full scale range, typical.
Input Impedance
Greater than 1M ohms.
Input Over-Voltage Protection
Bipolar Transient Voltage Suppressers (TVS),
220V working typical.
Input Resolution
Bipolar input: 1 part in 50000 (±25000)
Unipolar input: 1 part in 25000
Input Filter
Selectable digital filtering settings
(low, medium, high).
Input Filter Bandwidth
Normal mode plus digital filtering within the ADC.
Bandwidth (-3dB) varies with digital filter setting from
4Hz without filtering to 0.33Hz with high filtering.
Noise Rejection (Common Mode, High Filter)
138dB @ 60Hz, typical with 100 ohm input unbalance.
■ Output
Output Range
4 to 20mA DC.
Output Compliance
R load = (V supply - 11V) / 0.020A.
R load = 0 to 650 ohms @ 24V DC.
Output Response Time (for step input change)
Time to reach 98% of final output value (typical)
Low filter 50 milliseconds
Medium filter 150 milliseconds
High filter 1200 milliseconds
■ Environmental
Operating temperature
-40 to 80°C (-40° to 176°F).
Storage temperature
-40 to 85°C (-40 to 185°F).
Relative humidity
5 to 95% non-condensing.
Power Requirement
12-32V DC SELV (Safety Extra Low Voltage),
24mA max.
Isolation
1500V AC peak. 250V AC (354V DC) continuous
isolation between input and output circuits.
Shock and Vibration Immunity
Vibration: 5g, per IEC 60068-2-64.
Shock: 50g, per IEC 60068-2-27.
Electromagnetic Compatibility (EMC) Compliance
Radiated Emissions: BS EN 61000-6-4, CISPR 16.
RFI: BS EN 61000-6-2, IEC 61000-4-3.
Conducted RFI: BS EN 61000-6-2, IEC 61000-4-6.
ESD: BS EN 61000-6-2, IEC 61000-4-2.
EFT: BS EN 61000-6-2, IEC 61000-4-4.
Surge Immunity: BS EN 61000-6-2, IEC 61000-4-5.
Approvals
CE compliant. UL/cUL listing.
Designed for Class I; Division 2; Groups ABCD; Zone 2.
■ Physical
General
General-purpose enclosure designed for mounting on
35mm “T-type” DIN rail.
Case Material
Self-extinguishing polyamide, UL94 V-0 rated, color
light gray. General-purpose NEMA Type 1 enclosure.
I/O Connectors
Removable plug-in terminal blocks rated for 12A/250V;
AWG #26-12, stranded or solid copper wire.
Dimensions
12.5 x 114.5 x 99.0 mm (0.5 x 4.51 x 3.90 inches).
Shipping Weight
0.22 kg (0.5 pounds) packed.
Ordering Information
Models
TT238-0600
Two-wire transmitter, high voltage input.
Services
TT230-Config/Cal
Factory custom configuration/calibration service.
Specify input type, input/output zero and full-scale
values, filtering, and sensor fault settings on order.
Software
TTC-SIP (recommend one kit per customer)
Software Interface Package for Acromag TT Series
transmitters. Includes configuration software CD-ROM
(5040-944), isolator (USB-ISOLATOR) and two USB
cables (4001-112, 4001-113).
Accessories
See  for more information.
USB-ISOLATOR
USB-to-USB isolator, includes USB cable (4001-112).
IMPORTANT: To prevent damage or errors
from grounded PCs and surges, Acromag
strongly recommends use of their USB-ISOLATOR
when configuring a TT230 Series transmitter.
248-295-0880 ■ 248-624-9234 ■  ■  ■ 30765 

Wixom Rd, Wixom, MI 48393 USA
Transmitters: TT330 Series
Bulletin #8400-672e
Description
The TT339 model is a space-saving four-wire
transmitter that isolates and converts frequency,
pulse, or pulse-width modulation (PWM) input
to a proportional control signal. DC current and
voltage output are both supported on a single
model. An optional DIN rail bus can deliver
primary or redundant power to multiple units
without wiring.
High-voltage isolation separates the input from
the output circuit. Isolation protects from surges,
reduces noise, and eliminates ground loop errors.
Setup and calibration are fast and easy with
a convenient USB connection to your PC and
Acromag’s Windows configuration software.
Advanced signal processing capabilities, variable
range input, and convenient USB programming
make this instrument a very versatile frequency
measurement device. These transmitters can
withstand harsh industrial environments and
operate reliably across a wide temperature range
with very low drift. They feature RFI, EMI, ESD,
EFT, and surge protection plus low radiated
emissions.
Amplifier applications include:
• Speed pickup
• Line frequency monitoring
• Turbine flowmeter interface
• PWM sensing/feedback circuits
• Shaft encoder interface
Key Features & Benefits
■ Easy setup and digital calibration via USB with
Windows configuration software
■ Measures frequency or duty cycle and
interfaces many input types up to 100KHz
■ Accepts input amplitudes up to 120V rms
(±170V DC, unipolar or bipolar)
■ Adjustable 0Hz cut-off, sample averaging,
debounce, and output update time
■ Universal output connections support ranges
up to ±21mA or ±10.5V DC without rewiring
■ Supports normal or reverse-acting output
■ Fast response time and high accuracy
■ Space-saving 17.5mm (0.7 inch) unit with
pluggable terminals for convenient wiring
■ Redundant power ready (rail/local)
■ 1500V isolation, 3-way (power, input, output)
■ Shock (25g) and vibration (4g) resistant
■ Mounts on Type T DIN-rail
■ Wide ambient operation (-40 to 80°C)
■ CE Compliant and UL/cUL Class 1 Div 2 Zone 2
approvals
Multi-range frequency/pulse input ◆ Universal 

current/voltage output ◆ 12-32V DC local/bus power
TT339 Frequency/pulse/PWM input four-wire transmitter
9 8 7
12 11 10
BOTTOM VIEW
(INPUT SIDE)
TOP VIEW
(OUTPUT & POWER SIDE)
17.5 mm
(0.69 in.)
99.0 mm
(3.90 in.)
SIDE VIEW
OUTPUT
POWER
1
2
4
3
5
114.5 mm
(4.51 in.)
TB1
TB2
TB3
TB4
+IN
–RTN
COM
COM
+EXC
COM
+
6
2 1 3
5 4 6
+
–
DC SUPPLY
(12-32V DC)
EARTH
GROUND
+
–
12
11
10 –
FUSE
+
+
–
R
–
+
9
8
7
SHIELDED
CABLE
–
–
+
+
–
R
–
EARTH
GROUND
I
CURRENT
OUTPUT
VOLTAGE
OUTPUT
OPTIONAL
GROUND
RAIL BUS
POWER
35mm DIN Rail
Rail Bus Connector
#1005-063
TT300
Series
USB
TT300
Series
USB
TT300
Series
USB
TT300
Series
USB
TT300
Series
USB
TT300
Series
USB
–
Frequency/Pulse Input
MAG PICKUP
ENCODER
LINE FREQ
TTL/PNP/NPN
DRY CONTACT
2/3-WIRE PROX SWITCH
TURBINE FLOWMETER
PULSE UNI/BIPOLAR
PWM/DUTY CYCLE
TT330 Series Transmitter
Configuration Software is
downloadable (FREE) from
.
Windows® XP, Vista, 7, 8
USB
Configured
TT339 Model software allows you to configure
transmitters offline, save the file, and download into
units later, at your convenience.
The Agility™ Config Tool
is downloadable (FREE) at
the Google Play Store
For Android Devices only
248-295-0880 ■ 248-624-9234 ■  ■  ■ 30765 

Wixom Rd, Wixom, MI 48393 USA
All trademarks are property of their respective owners. 

Copyright © Acromag, Inc. 2013. Data subject to change 

without notice. Printed in USA 10/2013
Transmitters: TT330 Series
TT339 Frequency/pulse/PWM input four-wire transmitter
Performance Specifications
■ USB Interface
USB Connector
USB Mini-B type socket, 5-pin.
USB Data Rate
12Mbps. USB v1.1 and 2.0 compatible.
USB Transient Protection
Transient voltage suppression on power and data lines.
USB Cable Length
5.0 meters maximum.
Driver
Not required. Uses built-in Human Interface Device
(HID) USB drivers of the Windows operating system.
■ Input
Default Configuration/Calibration
±5.0V Square Wave; Input Threshold = Bipolar 0.0V;
Hysteresis ±25mV; Pull Up/Down = Disabled; Excitation
= Enabled; 0Hz Cutoff = 0.5Hz; Sample Average = 1;
Output Range = 4-20mA; I/O Scaling = 0Hz to 10KHz,
Normal Acting; Output Update = 100ms.
Frequency Input
Configurable for any range from 0Hz to 100KHz.
Accepts unipolar (non-zero crossing) or bipolar
(zero crossing) input signals. 0.5Hz minimum span.
1µs minimum pulse width.
Duty Cycle Input
Carrier frequency range: Any range from 0 to 20KHz.
Duty cycle range: 1 to 99%, depending on freq. range.
Input Scaling Adjust
Zero: Adjustable over 0 to 99% of full-scale input.
Full scale: Adjustable over 0.5Hz to 100KHz.
Cut-off frequency: Adjustable over 0.01Hz to 100KHz.
Unipolar Signal Configuration:
Amplitude: 0 to 3V DC min., 0 to 170V DC max.
Thresholds: Configurable for 1.6V DC (±25mV
hysteresis) or 5V DC (±83mV hysteresis), typical.
Bipolar Signal Configuration:
Amplitude: ±50 to ±200mV min. (depending on range
and hysteresis), 120V rms max. (±170V DC).
Thresholds: 0mV nominal (±25 or ±83mV hysteresis).
Input Pull-up/Pull-down (Internal)
Software-selectable 2.7KΩ input pull-up to +5V and a
1KΩ input pull-down to –FRTN, or disabled. 15V DC
maximum input when used.
Input Excitation Supply
+5V DC, current limited to +20mA typical.
Input Filter Bandwidth
-3dB at 35KHz, typical.
Input Impedance
37.2K ohms, typical.
Noise Rejection
Normal mode @ 60Hz: Not applicable.
Common mode @ 60Hz: 90dB.
■ Output
Output Range
Range Over-Range Resolution
±10V
±5V
0 to 10V
0 to 5V
±20mA
0 to 20mA
4 to 20mA
±10.5V
±5.25V
–0.5527 to +10.5V
–0.27634 to +5.25V
±21mA
–1.1054 to +21mA
–1.1054 to +21mA
1 part in 62558
1 part in 31278
1 part in 59293
1 part in 60414
1 part in 62400
1 part in 58732
1 part in 46984
Output Load
Voltage output: 1000 ohms minimum.
Current output: 525 ohms maximum.
Output Update
Software configurable from 10 to 5000ms. Determines
rate at which output signal updates, unless optionally
overridden by the 0Hz cutoff setting.
Output Accuracy
Better than ±0.05% of span, typical (±0.1% max.)
for for nominal input spans. Includes the effects
of repeatability, terminal point conformity, and
linearization, but does not include sensor error.
Output Ripple
Less than ±0.1% of output span.
Output Ambient Temperature Drift
Better than ±40ppm/°C (±0.0040%/°C).
■ Environmental
Operating temperature
-40 to 80°C (-40° to 176°F).
Storage temperature
-40 to 85°C (-40 to 185°F).
Relative humidity
5 to 95% non-condensing.
Power Requirement
12-32V DC SELV (Safety Extra Low Voltage), 24mA max.
Isolation
1500V AC peak. 250V AC (354V DC) continuous
isolation between input, output, and power (3-way).
Shock and Vibration Immunity
Vibration: 4g, per IEC 60068-2-64.
Shock: 25g, per IEC 60068-2-27
Approvals
CE compliant. UL/cUL Class I Div. 2 Zone 2.
Electromagnetic Compatibility (EMC) Compliance
Radiated Emissions: BS EN 61000-6-4, CISPR 16.
RFI: BS EN 61000-6-2, IEC 61000-4-3.
Conducted RFI: BS EN 61000-6-2, IEC 61000-4-6.
ESD: BS EN 61000-6-2, IEC 61000-4-2.
EFT: BS EN 61000-6-2, IEC 61000-4-4.
Surge Immunity: BS EN 61000-6-2, IEC 61000-4-5.
■ Physical
General
General-purpose enclosure designed for mounting on
35mm “T-type” DIN rail.
Case Material
Self-extinguishing polyamide, UL94 V-0 rated, color
light gray. General-purpose NEMA Type 1 enclosure.
I/O Connectors
Removable plug-in terminal blocks rated for 12A/250V;
AWG #26-12, stranded or solid copper wire.
Dimensions
17.5 x 114.5 x 99.0 mm (0.7 x 4.51 x 3.90 inches).
Shipping Weight
0.22 kg (0.5 pounds) packed.
Ordering Information
Models
TT339-0700
Transmitter, isolated frequency/pulse/PWM input
Services
TT330-Config/Cal
Factory custom configuration/calibration service.
Specify input type, input/output zero and full-scale
values, filtering, and sensor fault settings on order.
Software
TTC-SIP (recommend one kit per customer)
Software Interface Package for Acromag TT Series
transmitters. Includes configuration software CD-ROM
(5040-944), isolator (USB-ISOLATOR) and two USB
cables (4001-112, 4001-113).
Accessories
See  for more information.
USB-ISOLATOR
USB-to-USB isolator, includes USB cable (4001-112).
TTBUS-KIT
DIN rail bus power connector and left/right terminal
blocks. One kit supports multiple transmitters.
IMPORTANT: To prevent damage or errors
from grounded PCs and surges, Acromag
strongly recommends use of their USB-ISOLATOR
when configuring a TT330 Series transmitter.
248-295-0880 I 248-624-9234 I  I  I 30765 Wixom 

Rd, Wixom, MI 48393 USA
Transmitters: TT Series
Bulletin #8400-836
The Agility™ Config Tool is a
application that allows easy setup and
configuration of Acromag TT Series
transmitters via a tethered device.
This free app is available for Android
devices at the Google Play store
at Acromag Agility™ Config Tool.
Acromag Agility™ Config Tool Application
Key Features & Benefits
I Connects to Acromag TT Series transmitters
(except models TT231 and TT233)
I Requires the use of USB OTG Cable
(Acromag part #: 5028-565) and USB A to
Mini B Cable (Acromag part #: 4001-113)
I Configures and calibrates TT Series products
via phone or tablet running Android 4.0 ICS
(Ice Cream Sandwich) or later.
I View wiring diagrams, even without an
internet connection
I Perform quick and easy field diagnostics and
troubleshooting
I Ideal for field technicians
With a couple of taps, quickly configure input, output, 

unit and scaling options.
Quick and easy access to the wiring diagram, even offline 

without internet access.
248-295-0880 ■ 248-624-9234 ■  ■  ■ 30765 

Wixom Rd, Wixom, MI 48393 USA
Accessories
Bulletin #8400-742c
Description
This compact, industrial-grade isolator provides
a high-voltage isolation barrier between a
computer and a connected USB device. The
isolation protects equipment from electrical
surges and transient voltage spikes. It also
eliminates ground loop currents flowing between
the PC and peripherals which can cause damage
and inaccurate measurements. Additionally,
isolation minimizes conducted noise from static
discharge, magnetic fields, and radio frequency
interference.
Acromag’s USB isolator is very easy to use. The
isolator inserts in-line with the USB connection
and operates transparently. No special software
drivers are required. The unit receives power from
the PC’s USB port and isolates that power to the
connected device. High noise immunity and low
radiated emissions ensure reliable data transfer in
sensitive applications.
A number of high-performance features help
provide convenient and dependable operation.
The green LED indicates that power is being
received and blinks if the connected device draws
too much current. An internal jumper lets you
switch from Full Speed (12 Mbps) to Low Speed
(1.5 Mbps) communication. The reset button
offers a simple way to reinitialize a connected
device without breaking the cable connection.
High-retention USB sockets keep cables securely
attached under shock and vibration.
Key Features & Benefits
■ Isolates and protects a USB peripheral from a
USB host
■ Electrical isolation up to 1500V AC / 2100V DC
■ Common mode filtering on all data lines
■ Built-in surge/transient suppression up to 8kV
on all ports
■ Self-powered through the USB port
■ Supports USB 2.0 full speed (12 Mbps) and
USB 1.1 low speed (1.5 Mbps) data rates with
jumper-selection
■ LED for power indication and diagnostics
■ Reset button to reinitialize and re-enumerate
peripheral devices
■ Output short circuit protection with auto-retry
■ No software or configuration required
(transparent operation)
■ Uses standard high-retention USB Type A/B
cable connections (includes 1m cable)
■ Compact size and rugged design for harsh
environments
■ Wide ambient temperature operation
-40 to 70°C (-40 to 158°F)
■ CE, FCC, UL/cUL approvals
Ordering Information
Models
USB-ISOLATOR
USB isolator, includes USB cable (Part # 4001-112) for
isolator-to-PC connection
TTC-SIP
CD-ROM (Part #5040-944), USB isolator and two USB
cables (Part # 4001-112, 4001-113) for configuration
of Acromag TT Series transmitters
Accessories
4001-112
USB cable, 1 meter, with Type A to Type B plugs
4001-113
USB cable, 1 meter, with Type A to Mini-B plugs
USB-powered, USB 2.0 and 1.1 compatible ◆ 1500V AC / 

2100V DC isolation ◆ No drivers required
USB-ISOLATOR USB-to-USB Isolator
DEVICE
CONNECT
PC
CONNECT
POWER
RESET
CONNECTION
MODEL: USB-ISOLATOR
1.85” (46.99mm)
0.93” (23.50mm) 2.40” (60.96mm)
2 1
3 4
3 4 1 2
USB
TYPE B
USB
TYPE A
LEFT SIDE TOP VIEW RIGHT SIDE
248-295-0880 ■ 248-624-9234 ■  ■  ■ 30765 

Wixom Rd, Wixom, MI 48393 USA
All trademarks are property of their respective owners. 

Copyright © Acromag, Inc. 2013. Data subject to change 

without notice. Printed in USA 12/2013
Accessories
USB-ISOLATOR USB-to-USB Isolator
Performance Specifications
■ USB Port Interface
Standards
USB 1.1 and 2.0 compatible, full speed (12Mbps,
default) and low speed (1.5Mbps) data rates
supported. For low speed data rates, an internal
jumper is provided for user setting. Connection is
transparent, no software or configuration is required.
Isolator will not be enumerated in the device manager.
■ Physical
Dimensions
2.40” Length x 1.85” Wide x 0.925” High
(60.96mm x 46.99mm x 23.495mm).
Connectors
Standard high retention USB A/B connectors with
minimum withdrawal force of 15 Newtons. 1 meter
A/B cable included.
PC Connector
USB Type B receptacle
Device Connector
USB Type A receptacle
LED Indicator
Green LED indicates isolator receiving 5V power from
the USB computer bus. Flashing indicates short circuit/
retries on peripheral side.
Reset Button
Resets the connection to the USB peripheral device for
reinitialization and re-enumeration.
Enclosure Material
ABS Resin, UL94 rated, IP30 plastic case.
■ Environmental
Operating temperature
-40 to 70°C (-40° to 158°F).
Storage temperature
-40 to 85°C (-40 to 185°F).
Relative humidity
5 to 95% non-condensing.
Power
PC Connect Side: Standard USB bus power (5V DC).
Device Connect Side: 5V DC / 120mA with full power
connection from PC. Includes over-current protection
with auto-retry.
Isolation
1500V AC / 2100V DC peak isolation.
250V AC continuous safety isolation.
Agency Approvals:
CE and FCC compliant. UL/cUL Class 1 Div. 2 Zone 2.
Radiated Field Immunity (RFI)
Designed to comply with IEC1000-4-3 Level 3 and
EN50082-1.
Electromagnetic Compatibility (EMC)
Minimum immunity per EN61000-6-2:2001
Electrostatic Discharge (ESD) Immunity
Per IEC61000-4-2.
Radiated Field Immunity (RFI)
Per IEC61000-4-3.
Electrical Fast Transient Immunity (EFT)
Per IEC61000-4-4. Complies with IEC1000-4-4 Level 3
and EN50082-1.
Surge Immunity
Complies with IEC1000-4-5 Level 3 and EN50082-1.
Per IEC61000-4-5.
Conducted RF Immunity (CRFI)
Per IEC61000-4-6.
Emissions
Per EN61000-6-4:2001.
Radiated Frequency Emissions
Per CISPR11 Class A. Meets or exceeds EN50081-1 for
Class B equipment.
PERSONAL COMPUTER
RUNNING WINDOWS OS
1 METER CABLE
USB-A MALE
TO HOST USB PORT HOST
USB
HOST USB SERIAL
PORT CONNECTOR
AT BACK OF PC
CONFIGURATION
SOFTWARE
ACROMAG
HOST PC RUNNING
USB-B MALE
DEVICE
CONNECT
PC
CONNECT
POWER
RESET
CONNECTION
Acromag
THE LEADER IN INDUSTRIAL I/O
R
USB-A MALE
USB-ISOLATOR
USB MiniB Socket
(Front-Panel of Module)
MODEL TT2XX TRANSMITTER
USB MiniB MALE
TT SERIES USB TRANSMITTER CONNECTIONS
LED
(RECOMMENDED)
CABLE Model 4001-113
MODEL NO. - USB-ISOLATOR
CABLE Model 4001-112
248-295-0880 ■ 248-624-9234 ■  ■  ■ 30765 

Wixom Rd, Wixom, MI 48393 USA
Transmitters: TT330 Series
Bulletin #8400-666d
Description
The TT333 model is a space-saving four-wire
transmitter that isolates and converts a millivolt
or thermocouple sensor input to a proportional
control signal. DC current and voltage output are
both supported on a single model. An optional
DIN rail bus can deliver primary or redundant
power to multiple units without wiring.
High-voltage isolation separates the input from
the output circuit. Isolation protects from surges,
reduces noise, and eliminates ground loop errors.
Setup and calibration are fast and easy with
a convenient USB connection to your PC and
Acromag’s Windows configuration software.
Advanced signal processing capabilities, variable
range input, and convenient USB programming
make this instrument a very versatile temperature
measurement device. These transmitters can
withstand harsh industrial environments and
operate reliably across a wide temperature range
with very low drift. They feature RFI, EMI, ESD,
EFT, and surge protection plus low radiated
emissions.
Key Features & Benefits
■ Easy setup and digital calibration via USB with
Windows configuration software
■ Universal thermocouple or millivolt input
(TC Type J, K, T, R, S, E, B, N or ±100mV)
■ Universal output connections support ranges
up to ±21mA or ±10.5V DC without rewiring
■ Space-saving 17.5mm (0.7 inch) unit with
pluggable terminals for convenient wiring
■ High accuracy, linearity, stability, and reliability
■ User-selectable filtering (none, low, med., high)
■ Adjustable response times (15ms to 850ms)
■ Supports reverse-acting (inverse) output
■ Selectable upscale or downscale operation for
sensor faults and lead-break detection
■ Bus power, local power, or both
■ Redundant power ready (rail/local)
■ 1500V isolation, 3-way (power, input, output)
■ Shock (25g) and vibration (4g) resistant
■ Wide ambient operation (-40 to 80°C)
■ CE compliant. UL/cUL Class 1 Div 2 Zone 2
approvals
Universal thermocouple/millivolt input ◆ Universal 

current/voltage output ◆ 12-32V DC local/bus power
TT333 Thermocouple/millivolt input four-wire transmitter
BOTTOM VIEW
(INPUT SIDE)
TOP VIEW
(OUTPUT & POWER SIDE)
17.5 mm
(0.69 in.)
99.0 mm
(3.90 in.)
SIDE VIEW
OUTPUT
POWER
114.5 mm
(4.51 in.)
TB1 TB3
TB4
+
–
DC SUPPLY
(12-32V DC)
EARTH
GROUND
+
–
12
11
9 8 7
10 –
12 11 10
FUSE
+
+
–
R
–
+
9
8
7
SHIELDED
CABLE
–
–
+
+
–
R
–
EARTH
GROUND
I
CURRENT
OUTPUT
VOLTAGE
OUTPUT
OPTIONAL
GROUND
RAIL BUS
POWER
35mm DIN Rail
Rail Bus Connector
#1005-063
TT300
Series
USB
TT300
Series
USB
TT300
Series
USB
TT300
Series
USB
TT300
Series
USB
TT300
Series
USB
NC
SHIELDED CABLE
OPTIONAL
SHIELD
GROUND
THERMOCOUPLE
TYPE J, K, T, E, R, S, B, OR N
OR MILLIVOLT
INPUT
OPTIONAL
EARTH
GROUND
3
1
2
TB1
2 1 3
+
–
TT330 Series Transmitter
Configuration Software
is downloadable (FREE)
from .
Windows® XP, Vista,
7, and 8
USB
Configured
TT333 Model software allows you to configure transmitters 

offline,
save the file, and download into units later, at your 

convenience.
The Agility™ Config Tool
is downloadable (FREE) at
the Google Play Store
For Android Devices only
248-295-0880 ■ 248-624-9234 ■  ■  ■ 30765 

Wixom Rd, Wixom, MI 48393 USA
All trademarks are property of their respective owners. 

Copyright © Acromag, Inc. 2015. Data subject to change 

without notice. Printed in USA 5/2015
Transmitters: TT330 Series
TT333 Thermocouple/millivolt input four-wire transmitter
Performance Specifications
■ USB Interface
USB Connector
Type: USB Mini-B type socket, 5-pin.
Data rate: 12Mbps. USB v1.1 and 2.0 compatible.
Maximum cable length: 5.0 meters.
USB Transient Protection
Transient voltage suppression on power and data lines.
Driver
Not required. Uses Windows HID drivers.
■ Input
Default Configuration/Calibration
Input: TC J, -210 to 760°C, med. filter, break: up
Output: 4 to 20mA.
Input Ranges and Accuracy
Input Range Accuracy
TC J
TC K
TC T
TC R
TC S
TC E
TC B
TC N
mV
-210 to 760°C (-346 to 1400°F)
-200 to 1372°C (-328 to 2502°F)
-260 to 400°C (-436 to 752°F)
-50 to 1768°C (-58 to 3214°F)
-50 to 1768°C (-58 to 3214°F)
-200 to 1000°C (-328 to 1832°F)
260 to 1820°C (500 to 3308°F)
-230 to 1300°C (-382 to 2372°F)
-100 to 100mV
±0.5°C
±0.5°C
±0.5°C
±1.0°C
±1.0°C
±0.5°C
±1.0°C
±1.0°C
±0.1mV
Error includes the effects of repeatability, terminal
point conformity, and linearization (but not CJC error).
Thermocouple Reference
(Cold Junction Compensation)
±0.2°C typical, ±0.5°C maximum at 25°C.
Ambient Temperature Effect
Better than ±80ppm/°C (±0.008%/°C).
Scaling Adjust
Zero: 0 to 95% of range, typical.
Full scale: 5 to * of full scale range, typical.
Lead Break (Sensor Burnout) Detection
Upscale/downscale ±5% full scale range typical.
Input Over-Voltage Protection
Bipolar Transient Voltage Suppressers (TVS),
5.6V clamp level typical.
Input Resolution
Millivolt input: 0.0025% (1 part in 40,000)
Thermocouple input: 0.1°C.
Input Impedance
Current input: 24.9 ohms.
Voltage input: 15M ohms
Input Filter
Selectable digital filtering settings (none, low, medium,
and high)
Noise Rejection
Normal mode @ 60Hz:
>0.5dB (no filter), >80dB (high filter)
Common mode @ 60Hz:
>100dB (no filter), >130dB (high filter)
■ Output
Output Range
Range Over-Range Resolution
±10V
±5V
0 to 10V
0 to 5V
±20mA
0 to 20mA
4 to 20mA
±10.5V
±5.25V
–0.5527 to +10.5V
–0.27634 to +5.25V
±21mA
–1.1054 to 21mA
–1.1054 to 21mA
1 part in 62415
1 part in 31208
1 part in 59240
1 part in 60262
1 part in 62259
1 part in 58596
1 part in 46877
Output Load
Voltage output: 1K ohms minimum.
Current output: 0-550 ohms.
Output Response Time (for step input change)
Time to reach 98% of final output value (typical)
No filter
Low filter
15 milliseconds
40 milliseconds
Medium filter 120 milliseconds
High filter 850 milliseconds
Output Ripple
Less than ±0.1% of output span.
Output Ambient Temperature Drift
Better than ±80ppm/°C (±0.0080%/°C.
■ Environmental
Operating temperature
-40 to 80°C (-40° to 176°F).
Storage temperature
-40 to 85°C (-40 to 185°F).
Relative humidity
5 to 95% non-condensing.
Power Requirement
12-32V DC SELV (Safety Extra Low Voltage),
24mA max.
Isolation
1500V AC peak. 250V AC (354V DC) continuous
isolation between input, output, and power (3-way).
Shock and Vibration Immunity
Vibration: 5g, per IEC 60068-2-64.
Shock: 50g, per IEC 60068-2-27
Approvals
CE compliant. UL/cUL listing.
Designed for Class I; Division 2; Groups ABCD; Zone 2.
Electromagnetic Compatibility (EMC) Compliance
Radiated Emissions: BS EN 61000-6-4, CISPR 16.
RFI: BS EN 61000-6-2, IEC 61000-4-3.
Conducted RFI: BS EN 61000-6-2, IEC 61000-4-6.
ESD: BS EN 61000-6-2, IEC 61000-4-2.
EFT: BS EN 61000-6-2, IEC 61000-4-4.
Surge Immunity: BS EN 61000-6-2, IEC 61000-4-5.
■ Physical
General
General-purpose enclosure designed for mounting on
35mm “T-type” DIN rail.
Case Material
Self-extinguishing polyamide, UL94 V-0 rated, color
light gray. General-purpose NEMA Type 1 enclosure.
I/O Connectors
Removable plug-in terminal blocks rated for 12A/250V;
AWG #26-12, stranded or solid copper wire.
Dimensions
17.5 x 114.5 x 99.0 mm (0.7 x 4.51 x 3.90 inches).
Shipping Weight
0.22 kg (0.5 pounds) packed.
Ordering Information
Models
TT333-0700
Four-wire transmitter, thermocouple/millivolt input.
Services
TT330-Config/Cal
Factory custom configuration/calibration service.
Specify input type, input/output zero and full-scale
values, filtering, and sensor fault settings on order.
Software
TTC-SIP (recommend one kit per customer)
Software Interface Package for Acromag TT Series
transmitters. Includes configuration software CD-ROM
(5040-944), isolator (USB-ISOLATOR) and two USB
cables (4001-112, 4001-113).
Accessories
See  for more information.
USB-ISOLATOR
USB-to-USB isolator, includes USB cable (4001-112).
TTBUS-KIT
DIN rail bus power connector and left/right terminal
blocks. One kit supports multiple transmitters.
IMPORTANT: To prevent damage or errors
from grounded PCs and surges, Acromag
strongly recommends use of their USB-ISOLATOR
when configuring a TT330 Series transmitter.
248-295-0880 ■ 248-624-9234 ■  ■  ■ 30765 

Wixom Rd, Wixom, MI 48393 USA
Transmitters: TT330 Series
Bulletin #8400-667b
Description
The TT334 model is a space-saving four-wire
transmitter that isolates and converts a resistive
sensor input to a proportional control signal. DC
current and voltage output are both supported
on a single model. An optional DIN rail bus can
deliver primary or redundant power to multiple
units without wiring.
High-voltage isolation separates the input from
the output circuit. Isolation protects from surges,
reduces noise, and eliminates ground loop errors.
Setup and calibration are fast and easy with
a convenient USB connection to your PC and
Acromag’s Windows configuration software.
Advanced signal processing capabilities, variable
range input, and convenient USB programming
make this instrument a very versatile temperature
measurement device. These transmitters can
withstand harsh industrial environments and
operate reliably across a wide temperature range
with very low drift. They feature RFI, EMI, ESD,
EFT, and surge protection plus low radiated
emissions.
Key Features & Benefits
■ Easy setup and digital calibration via USB with
Windows configuration software
■ Interfaces 100-100kΩ potentiometer/slidewire
and 100-1MΩ NTC thermistor/rheostat inputs
■ Customizable thermistor linearization table
with preset curves for popular resistances
■ Universal output connections support ranges
up to ±21mA or ±10.5V DC without rewiring
■ Pluggable terminals for convenient wiring
■ High accuracy, linearity, stability, and reliability
■ User-selectable filtering (none, low, med., high)
■ Fast response (as low as 21ms)
■ Supports normal or reverse-acting output
■ Selectable upscale or downscale operation for
sensor faults and lead-break detection
■ Bus power, local power, or both for redundant
power supplies
■ 1500V isolation, 3-way (power, input, output)
■ Shock (25g) and vibration (4g) resistant
■ Wide ambient operation (-40 to 80°C)
■ CE and UL/cUL Class 1 Div 2 Zone 2 approvals
Pot/slidewire, thermistor input ◆ Universal 

current/voltage output ◆ 12-32V DC local/bus power
TT334 Potentiometer / thermistor input four-wire 

transmitter
9 8 7
12 11 10
BOTTOM VIEW
(INPUT SIDE)
TOP VIEW
(OUTPUT & POWER SIDE)
17.5 mm
(0.69 in.)
99.0 mm
(3.90 in.)
SIDE VIEW
OUTPUT
POWER
3 NC
114.5 mm
(4.51 in.)
TB1
TB2
TB3
TB4
6 NC
2 1 3
5 4 6
+
–
DC SUPPLY
(12-32V DC)
EARTH
GROUND
+
–
12
11
10 –
FUSE
+
+
–
R
–
+
9
8
7
SHIELDED
CABLE
–
–
+
+
–
R
–
EARTH
GROUND
I
CURRENT
OUTPUT
VOLTAGE
OUTPUT
OPTIONAL
GROUND
RAIL BUS
POWER
35mm DIN Rail
Rail Bus Connector
#1005-063
TT300
Series
USB
TT300
Series
USB
TT300
Series
USB
TT300
Series
USB
TT300
Series
USB
TT300
Series
USB
W
H
1
2
4
5
THERMISTOR RHEOSTAT POT
–
+
– –
+
Resistance Input
MAX
MIN
TT330 Series Transmitter
Configuration Software
is downloadable (FREE)
from .
Windows® XP, Vista,
7, and 8
USB
Configured
TT334 Model software allows you to configure transmitters 

offline,
save the file, and download into units later, at your 

convenience.
248-295-0880 ■ 248-624-9234 ■  ■  ■ 30765 

Wixom Rd, Wixom, MI 48393 USA
All trademarks are property of their respective owners. 

Copyright © Acromag, Inc. 2013. Data subject to change 

without notice. Printed in USA 8/2013
Transmitters: TT330 Series
TT334 Potentiometer / thermistor input four-wire 

transmitter
Performance Specifications
■ USB Interface
USB Connector
Type: USB Mini-B type socket, 5-pin.
Data rate: 12Mbps. USB v1.1 and 2.0 compatible.
Maximum cable length: 5.0 meters.
USB Transient Protection
Transient voltage suppression on power and data lines.
Driver
Not required. Uses Windows HID drivers.
■ Input
Default Configuration
Pot/slidewire, 0% to * input, 4-20mA output,
downscale break detect, medium filter.
Input Configuration
Two- or three-wire sensor input connections.
User-configurable thermistor linearization table has
preset curves for resistances below at 25°C.
Programs in °C, °F, °K, or ohmic integer values only.
Input Ranges
Input Type Input Range Accuracy
Potentiometer
Rheostat
Thermistor 2252Ω
Thermistor 2752Ω
Thermistor 2795Ω
Thermistor 3kΩ
Thermistor 5kΩ
Thermistor 10kΩ
Thermistor 30kΩ
Custom thermistor
0 to *
(100 to 100KΩ)
100 to 1MΩ
-40 to 100°C
(-40 to 212°F)
-40 to 100°C
-40 to 100°C
-40 to 100°C
-40 to 100°C
-40 to 100°C
-40 to 100°C
100 to 1MΩ
< ±0.01% of span
< ±0.5% of input
< ±0.05°C
(±0.09°F)
< ±0.05°C (±0.09°F)
< ±0.05°C (±0.09°F)
< ±0.05°C (±0.09°F)
< ±0.05°C (±0.09°F)
< ±0.05°C (±0.09°F)
< ±0.05°C (±0.09°F)
< ±0.5% of input
Input Scaling Adjust
Zero: 0 to 95% of range, typical.
Full scale: 5 to * of full scale range, typical.
Lead Break (Sensor Burnout) Detection
Configurable for either upscale or downscale on
thermistor or rheostat inputs. Downscale only on
potentiometer/slidewire inputs.
Excitation Voltage
Thermistor/rheostat: 1.25V DC, typical.
Potentiometer: 0.3V DC, limited to 3.35mA, typical.
■ Output
Output Range
Range Over-Range Resolution
±10V
±5V
0 to 10V
0 to 5V
±20mA
0 to 20mA
4 to 20mA
±10.5V
±5.25V
–0.5527 to +10.5V
–0.27634 to +5.25V
±21mA
–1.1054 to 21mA
–1.1054 to 21mA
1 part in 62558
1 part in 31278
1 part in 59293
1 part in 60414
1 part in 62400
1 part in 58732
1 part in 46984
Output Accuracy
Better than ±0.05% of span, typical (±0.1% max.)
for for nominal input spans. Includes the effects
of repeatability, terminal point conformity, and
linearization, but does not include sensor error.
Output Load
Voltage output: 1K ohms minimum.
Current output: 0-525 ohms.
Output Response Time (for step input change)
No filter: 21ms.  Medium filter: 150ms.
Low filter: 40ms.  High filter: 1200ms.
Output Ambient Temperature Drift
Better than ±80ppm/°C (±0.0080%/°C).