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.

Turn heating equipment on or off at a specified temperature. Switches have a probe on a cable for remote temperature readings. Set the actuation point with the adjustment dial.

Switches that control one circuit 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).

Switches that control two circuits are double pole, single throw (DPST). They turn two circuits from on to off (normally closed).

Switches with an open housing are often added to existing enclosures or custom installations.

Switches with a pilot light indicate when the switch is on.

Use packing seals and fittings (sold separately) to seal the probe into threaded tanks and pipes.

To protect these switches from splashing water, corrosive liquid, and dust, the housing meets NEMA 4X for washdown conditions. Switches turn heating equipment on or off at a specified temperature. All have a probe on a cable for remote temperature readings. Set actuation points with the adjustment dial.

Single pole, double throw (SPDT) switches can be set to turn circuits from off to on (normally open) or from on to off (normally closed). 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). 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. 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).

Double pole, single throw (DPST) switch turns two circuits from on to off (normally closed).

Triple pole, single throw (3PST) switches turn three circuits from on to off (normally closed).

Turn heating equipment on or off in environments with flammable gases and combustible dust, 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 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).

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.

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.

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).

These controllers turn on and off in short cycles to continuously maintain a stable set temperature. They require a separate thermometer to calibrate and monitor temperature. Adjust the ratio of on to off time with the dial.

Mechanical relay actuates one circuit directly. It is single pole, single throw (SPST) and turns the circuit from on to off (normally closed).

Solid-state relay actuates an external relay (not included). It has a longer service life than a mechanical relay.

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).

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 and combustible dust. 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 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).