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

Often used to control heat cable output, these switches mount on surfaces to maintain the temperature within a preset range. All are single pole, double throw (SPDT). They turn equipment on when the surface temperature falls below the minimum actuation point and turn equipment off when the surface temperature rises above the maximum actuation point. All are FM approved for use in Class I, Division 2, Groups A, B, C, and D hazardous locations with flammable gases, such as refineries and chemical plants.

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 single pole, single throw (SPST) and control one circuit.

Normally open switches turn the circuit from off to on.

Normally closed switches turn the circuit from on to off.

Often used in hazardous locations, such as chemical plants, refineries, and grain elevators, these switches have a housing that’s UL listed for environments with flammable gases, combustible dust, and ignitable fibers. It 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. The housing also meets NEMA 4X for use in washdown environments with splashing water, corrosive liquid, and dust. Install the threaded probe directly into tanks, pipelines, and other process components to turn heating equipment on or off at a specified temperature. Set actuation points with the adjustment dial.

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

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

Install the threaded probe directly into tanks, pipelines, and other process components to turn heating equipment on or off at a specified temperature. These switches have an adjustment dial to set the actuation point. All are single pole, double throw (SPDT). They can be set to turn one circuit from off to on (normally open) or from on to off (normally closed).

Turn heating equipment on or off in washdown environments. To withstand splashing water, corrosive liquid, and dust, these switches have a housing that meets NEMA 4X. The threaded probe installs directly into tanks, pipelines, and other process components. Use the adjustment dial to set actuation points.

Switches with one actuation point have one single pole, double throw (SPDT) relay. The relay can be set to turn one circuit from off to on (normally open) or from on to off (normally closed).

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

Install the probe directly into drilled and reamed holes to turn heating equipment on or off at a specified temperature. Use the adjustment screw to set the actuation point. All switches are single pole, single throw (SPST) and control one circuit.

Normally open switches turn the circuit from off to on.

Normally closed switches turn the circuit from on to off.

The faceplate is sealed to meet NEMA 4X and IP66 for protection in washdown environments with splashing water, corrosive liquid, and dust. The rear case meets IP20. These controllers have proportional-integral-derivative (PID) software with fuzzy logic that learns system behavior and automatically compensates for changes to achieve high accuracy in applications with fluctuating conditions. They read temperature with a highly sensitive thermocouple probe (sold separately) in critical process applications to turn heating equipment on or off at a specified temperature. All fit into instrument panels with DIN cutouts. Set actuation points with the keypad. Controllers are auto/manual selectable.

Controllers with 1/16 DIN trade size have one alarm relay.

Controllers with 1/8 and 1/4 DIN trade size have two alarm relays.

Mechanical relays actuate one circuit directly. Single pole, double throw (SPDT) relays can be set to turn the circuit from off to on (normally open) or from on to off (normally closed). Single pole, single throw (SPST) relay turns the circuit from off to on (normally open).

Solid-state relays actuate an external relay (not included). They have a longer service life than mechanical or signal relays.

Signal relays output 4-20 mA current to actuate equipment on a current loop.

For high accuracy in applications with fluctuating conditions, these controllers have proportional-integral-derivative (PID) software with fuzzy logic that learns system behavior and automatically compensates for changes. They read temperature with a highly sensitive thermocouple or RTD probe (sold separately) in critical process applications to turn heating equipment on or off at a specified temperature. All fit DIN cutouts for installation into instrument panels. Use the keypad to set the actuation point. Controllers are auto/manual selectable and have two alarm relays.

Mechanical relays actuate circuits directly. All are single pole, single throw (SPST) and turn circuits from off to on (normally open). Controller with one mechanical relay actuates one circuit. Controller with two mechanical relays actuates two circuits.

Signal relays output 4-20 mA current to actuate equipment on a current loop.

Install these controllers into instrument panels. They read temperature with a highly sensitive thermocouple or RTD probe (sold separately) in critical process applications to turn heating equipment on or off at a specified temperature. Set the actuation point with the keypad. Controllers are single pole, double throw (SPDT). They can be set to turn one circuit from off to on (normally open) or on to off (normally closed).

For protection in washdown conditions with splashing water, corrosive liquid, and dust, these controllers have a housing that meets NEMA 4X. They include a highly sensitive Type J thermocouple to take temperature readings in critical process applications and turn heating equipment on at a specified temperature. Use the keypad to set the actuation point. Controllers are triple pole, single throw (3PST). All have a control relay that turns three circuits from off to on (normally open). They also have two alarm relays.