Turn heating equipment on or off in environments with flammable gases, combustible dust, and ignitable fibers, such as chemical plants, refineries, and grain elevators. The switch housing is UL listed for use in Class I, Divisions 1 and 2, Groups B, C, and D; Class II, Divisions 1 and 2, Groups E, F, and G; and Class III, Divisions 1 and 2 hazardous locations. It also meets NEMA 4X for use in washdown environments with splashing water, corrosive liquid, and dust. Switches have a probe on a cable for remote temperature readings. Set actuation points with the adjustment dial.

Switch with one actuation point has one SPDT (single pole, double throw) relay. The relay can be set to turn one circuit from off to on (normally open) or from on to off (normally closed). The probe has 1/2 NPT male threads for installation directly into tanks, pipelines, and other process components. It comes with a bushing that adapts the thread size to 3/4 NPT male.

Switch with two actuation points has two SPDT (single pole, double throw) relays. Each relay can be set to turn one circuit from off to on (normally open) or from on to off (normally closed).

Since these switches don’t have a housing above the probe, they are often used in tight spaces and low-clearance areas. The threaded probe installs directly into tanks, pipelines, and other process components to turn heating equipment on or off at a specified temperature. Use the adjustment screw to set the actuation point. All switches are SPST (single pole, single throw) and control one circuit.

Normally open switches turn the circuit from off to on.

Normally closed switches turn the circuit from on to off.

For technical drawings and 3-D models, click on a part number.

Switch heating equipment on and off at a specified temperature by installing these electronic switches directly into tanks, pipelines, and other process components. Simply twist the outer rings to adjust your set point—no need for tools. A locking ring keeps the sensor in place. Once the set point is reached, an LED illuminates, indicating the switching status. These switches produce an electronic PNP signal output and are often used to communicate with programmable logic controllers (PLC) in hydraulics, pneumatics, air-conditioning, and refrigeration applications. Because they are electronic, they provide more flexibility and control than other switches, making them ideal for control and automation applications.

Made of stainless steel, these switches resist corrosion and chemicals. They are rated IP67 for protection from dust and temporary submersion. They also meet U.S., Canadian, and European safety standards. These switches have an micro M12 plug connection and are compatible with micro M12 sockets, allowing you to quickly connect and disconnect the switch.

To view switch wiring diagrams, select a part number and click Product Detail.

BSPP connections are also known as G connections.

Normally open switches turn the circuit from off to on. Normally closed switches turn the circuit from on to off.

Switches with one actuation point have an adjustable differential, so they activate at a range above and below the desired set point, limiting the frequency of switching.

For technical drawings and 3-D models, click on a part number.