Base metal thermocouple assemblies are designed to be used in the most severe and demanding environments. The choice of a specific style is to a large degree determined by the temperature working range, ambient atmospheric or media conditions, as well as the size and shape required for the application. Control requirements such as accuracy and speed of response may also be considerations.

When speed of response is critical, specify the open end construction. An exposed element is directly subject to corrosion and physical damage; therefore, this style should be used only after consideration of the relative need for fast response versus thermocouple life.

Another feature for improving response time is the butt welded junction. This design has less mass and therefore faster response that the twist, which is normally supplied by the factory. The twist weld offers greater mechanical strength and longer life.

When possible, the sensor should be installed in a vertical plane rather than horizontal to prevent sagging.

Base metal thermocouple assemblies are designed to be used in the most severe and demanding environments. The choice of a specific style is to a large degree determined by the temperature working range, ambient atmospheric or media conditions, as well as the size and shape required for the application. Control requirements such as accuracy and speed of response may also be considerations.

When speed of response is critical, specify the open end construction. An exposed element is directly subject to corrosion and physical damage; therefore, this style should be used only after consideration of the relative need for fast response versus thermocouple life.

Another feature for improving response time is the butt welded junction. This design has less mass and therefore faster response that the twist, which is normally supplied by the factory. The twist weld offers greater mechanical strength and longer life.

This sensor offers the same functionality and features as the 90° elbow style described on the previous pages, except it is not offered with a ceramic tube or a nickel tube.

Offers the same functionality and features as other industrial sensors described on previous pages, except will accommodate wire only down to 14 gauge.

For high performance and added flexibility, we suggest you consider our BARCOPAC® MgO insulated thermocouples.

This thermocouple can be mounted to the process with compression attaching device.

Elements are constructed of high quality material using modern techniques to construct the hot junction. Other high quality components are designed to meet rugged requirements. Mullite protection pipes are impervious to gases at high temperature. They have good resistance to thermal shock but poor resistance to mechanical shock; they should be mounted vertically.

Aluminum oxide protection tubes have fair resistance to thermal shock and mechanical shock. They are impervious to gases up to 3200°F.

Primary metal industry, heat treat furnaces, forging furnaces and bright annealing. Suitable for ceramics and glass industries. Semi-conductor manufacturing and research laboratories.

This thermocouple is assembled with two tubes to assure element protection in the event one of the tubes cracks or breaks. Also, two tubes provide additional mechanical strength.

Mullite protection tubes are impervious to gases at high temperature. They have good resistance to thermal shock but poor resistance to mechanical shock; they should be mounted vertically.

3/8” o.d. primary tube is inside 11/16” o.d. outer tube; 11/16” o.d. primary tube is inside 1” o.d. outer tube.

Aluminum oxide protection tubes have fair resistance to thermal shock and mechanical shock. They are impervious to gases up to 3200°F.

Primary metal industry, heat treat furnaces, forging furnaces and bright annealing. Suitable for ceramics and glass industries. Semi-conductor manufacturing and research laboratories.

Elements are made of top quality material. Insulators are 99.7% Al2O3 （high purity）. Primary protection tube is ether high temperature Mullite or aluminum oxide. The secondary protection tube is Inconel 601 which has a high resistance to thermal and mechanical shock up to 2300°F. The Inconel 601 protection tube has excellent resistance to oxidation up to 2300°F and to corrosion at high temperature. Hydrogen makes it brittle.

3/8” o.d. primary tube is inside an 0.8450” o.d. pipe; 11/16” o.d. tube is inside a 1.050” o.d. pipe.

For use in furnaces, kilns, and other locations where the protection tube is subject to either mechanical or thermal shock. Suitable for high temperature heat treating, carburizing, nitriding, salt baths, blast furnace operation, gas generators, and ceramic kilns.

The design of this assembly is for the maximum protection of the noble metal element. The primary protection tube （or tubes） protects the element from outside gases while the outer tube of silicon carbide protects the assembly against the cutting action of flames and hot gases. You can choose either high temperature Mullite or aluminum oxide for the primary tube material. High temperature Mullite is not recommended for temperatures above 1800°F.

Industrial Silicon carbide protection tubes have low lag time and long life; high resistance to thermal shock, high conductivity, and impermeability. They are especially resistant to many corrosive atmospheres and are highly resistant to attack by many molten nonferrous metals.

For use with molten nonferrous metals, brick kilns, ceramic kilns and where the thermocouple is exposed to either flames or hot gases.

This thermocouple is suggested for pickling baths, and chemical and acid vats. It consists of a 20 gauge element inside .188” o.d. Teflon FEP coated tube. Teflon FEP is resistant to most acids and bases, dry fluorine at 300°F, molten sodium hydroxide, and steam up to 450°F. Among the organics, nearly complete resistance is shown to aliphatics, aromatics, alcohol, acids, and chlorinated solvents.

RTDs change resistance with temperature changes. They are more accurate than thermocouples, especially over a narrow range. Standard accuracy ratings of 0.25% and 0.10% are offered. However, they offer less resistance to physical shock, and respond slower.

The RTD element is a wire coil precision wound to a specific resistance ＆#118alue, hermetically sealed to prevent influence from moisture. It is mounted in the tip of a metal protection tube for physical protection