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Mercoid 液位開關(guān) 1251/1253/1254系列

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Mercoid液位開關(guān)1251/1253/1254Leakproofallweldedheavydutycarbonsteelbodiescoupledwithsnapactionormercuryswitchesprovidereliable,longtermserviceforcompatibleliquids

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Mercoid 液位開關(guān) 1251/1253/1254

Leak proof all welded heavy duty carbon steel bodies coupled with snap action or mercury switches provide reliable, long term service for compatible liquids. The use of an external magnet reduces the possibility of magnetic particle build-up inside the armature tube and subsequent loss of operation as may occur with the internal magnet repulsion design. A variety of snap action or mercury switches in SPST, SPDT, DPDT or DPST configurations will satisfy most electrical requirements. These switch assemblies are contained in NEMA 1 general purpose, NEMA 4X weatherproof, NEMA 7, 9 groups B, C, D, E, F, G, explosion-proof or explosion-proof – vapor proof enclosures.

C1-40:Minimum specific gravity 0.40. Process pressure 1250 psi (86 bar) at 100°F (38°C) to 500°F (260°C).

Temperature Limit:Ambient Temperature: 212°F (100°C); Process Temperature: up to 500°F (260°C).

Switch Type:Snap action or mercury. See Model Chart.

Electrical Rating:See Model Chart.

Wiring Connections:G, WT or E enclosure: terminal block; EV enclosure: 18" (460 mm) leads.

Process Connection:Combination 1" NPT/socket weld hubs or flanges. See Model Chart.

Enclosures:G: painted steel and aluminum; WT: painted steel, aluminum and neoprene; E: aluminum; EV: aluminum and neoprene.

Wetted Parts:C1 construction. Chamber: carbon steel; Trim: 303SS, 304SS, 316SS and 430SS.

Weight:1251: 40 lb (18 kg); 1253: 50 lb (22.7 kg); 1254: 57 lb (25.8 kg).

Suggested Specifications:
Liquid level control shall be 1251 (1253) (1254) Series with 1" combination NPT/socket weld hub (flanged) process connections. Chamber shall be welded and suitable for operation at 1250 psig (86 bar) and 500°F (260°C) with a minimum specific gravity of 0.40. Circuit shall be hermetically sealed snap action (mercury) switch (SPST) (SPDT) (DPDT). Enclosure shall be general purpose, (explosion- proof) (explosion-proof – vapor proof). Switch mechanism shall be gravity return and shall be activated by a stainless steel float.

Model Chart

EXAMPLE	1251	WT	7810	C1	40		1251-WT-7810-C1-40 Liquid Level Control, weatherproof enclosure, SPDT snap switch, fixed deadband, automatic reset, operating pressure 1250 psig (86 bar) at 100°F (38°C), 1250 psig (86 bar) at 500°F (260°C), side/bottom process connections, 1" NPT/socket weld hubs, minimum specific gravity 0.40.
CONNECTION	1251						One Horizontal and One Vertical 1" Socket Weld or 1" NPT Combination Hub
	1253						One Vertical and One Horizontal Flanged Connection
	1254						Two Vertical Flanged Connections
	1254T
ENCLOSURE		G					General Purpose, NEMA 1
		WT					Weatherproof, NEMA 3R, 4, 4X
		E					Explosion-proof, NEMA 7, 9, Class I Groups B, C, D, Class II Groups E, F, G
		EV					Explosion-proof/Vapor-proof, NEMA 7, 9, Class I Groups B, C, D, Class II Groups E, F, G
CIRCUITS (for electrical circuits see charts A & B below)			48XX				Single Stage Mercury Switch, see chart A
			48XX-XX				Two Stage, Mercury Switch, see chart A
			78XX				Single Stage, Snap Switch, see chart B
			78XX-XX				Two Stage, Snap Switch, see chart B
			78XXHM				Hermetically Sealed Snap Switch, see chart B
			98XX				Single Stage, High Capacity DC Snap Switch, use heat fins (HF) if process temperature exceeds 350°F (177°C), do not exceed 450°F (232°C), see chart B
			98XX-XX				Two Stage, High Capacity DC Snap Switch, use heat fins (HF) if process temperature exceeds 350°F (177°C), do not exceed 450°F (232°C), see chart B
CHAMBER MATERIAL				C1			Carbon Steel Body
				C216			316SS Body
				HFC1			Heat Fins & Carbon Steel Body
				HFC216			Heat Fins & 316SS Body (1251, 1253 only)
MINIMUM SPECIFIC GRAVITY					40		0.40 Specific Gravity (1251 only)
					140		0.40 Specific Gravity & 150# Flange (1253, 1254 only)
					340		0.40 Specific Gravity & 300# Flange (1253, 1254 only)
					640		0.40 Specific Gravity & 600# Flange (1253, 1254 only)
OPTIONS						R	Manual Reset, Single Stage
						R1	Manual Reset, Lower Stage 2-Stage Control
						R2	Manual Reset, Upper Stage 2-Stage Control
						R3	Manual Reset, Both Stages 2-Stage Control
						STW	SS Tag Wired
						01	Breather Only (E-Housing only)
						02	Drain Only (E-Housing only)
						12	Breather & Drain (E-Housing only)
						23720	Fungus Proofing