Hazardous Location Threaded Temperature Switches
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 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).
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).
Probe | ||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Temp. Range, °F | No. of Actuation Points | Actuation Tolerance | No. of Circuits Controlled | Electrical Phase | Max. Switching Current @ Voltage  | Dia. | Lg. | Material | Ht. | Wd. | Dp. | Environmental Rating | Each | |
Threaded Brass Probe—1/2 NPT Male | ||||||||||||||
| 0° to 225° | 1 | ±1% | 1 | Single | 15 A @ 125 V AC 15 A @ 250 V AC 15 A @ 480 V AC | 9/16" | 1 7/8" | Brass | 10" | 5 1/8" | 5 3/16" | NEC Class I Divisions 1, 2 Groups B, C, D NEC Class II Divisions 1, 2 Groups E, F, G NEC Class III Divisions 1, 2 NEC Zone 1 Groups IIB, IIA IEC Zone 1 Groups IIC, IIB, IIA IEC Zone 21 Groups IIIC, IIIB, IIIA IP66 NEMA 4X NEMA 7 NEMA 9 | 0000000 | 0000000 |
| 0° to 225° | 2 | ±1% | 2 | Single | 15 A @ 125 V AC 15 A @ 250 V AC 15 A @ 480 V AC | 9/16" | 1 7/8" | Brass | 10" | 5 1/8" | 5 3/16" | NEC Class I Divisions 1, 2 Groups B, C, D NEC Class II Divisions 1, 2 Groups E, F, G NEC Class III Divisions 1, 2 NEC Zone 1 Groups IIB, IIA IEC Zone 1 Groups IIC, IIB, IIA IEC Zone 21 Groups IIIC, IIIB, IIIA IP66 NEMA 4X NEMA 7 NEMA 9 | 0000000 | 00000000 |
Hazardous Location Wall-Mount Temperature Switches
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).
Probe | |||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Temp. Range, °F | Temp. Accuracy, °F | No. of Actuation Points | Electrical Phase | Max. Switching Current | Dia. | Lg. | Ht. | Wd. | Dp. | Environmental Rating | Includes | Each | |
SPDT—1 Circuit Controlled | |||||||||||||
Threaded Stainless Steel Probe—1/2 NPT Male | |||||||||||||
| 30° to 250° | ±5° | 1 | Single | 15 A @ 125 V AC 15 A @ 250 V AC 15 A @ 480 V AC | 3/8" | 2 5/8" | 9 5/16" | 5 1/8" | 5 3/16" | NEC Class I Divisions 1, 2 Groups B, C, D NEC Class II Divisions 1, 2 Groups E, F, G NEC Class III Divisions 1, 2 NEC Zone 1 Groups IIB, IIA IEC Zone 1 Groups IIC, IIB, IIA IEC Zone 21 Groups IIIC, IIIB, IIIA IP66 NEMA 4X NEMA 7 NEMA 9 | 1/2 × 3/4 NPT Adapter Bushing | 0000000 | 000000000 |
SPDT—2 Circuit Controlled | |||||||||||||
Unthreaded Stainless Steel Probe | |||||||||||||
| 30° to 250° | ±5° | 2 | Single | 15 A @ 125 V AC 15 A @ 250 V AC 15 A @ 480 V AC | 3/8" | 2 5/8" | 9 5/16" | 5 1/8" | 5 3/16" | NEC Class I Divisions 1, 2 Groups B, C, D NEC Class II Divisions 1, 2 Groups E, F, G NEC Class III Divisions 1, 2 NEC Zone 1 Groups IIB, IIA IEC Zone 1 Groups IIC, IIB, IIA IEC Zone 21 Groups IIIC, IIIB, IIIA IP66 NEMA 4X NEMA 7 NEMA 9 | __ | 0000000 | 00000000 |
| Packing Seals and Fittings | 0000000 | Each | 000000 |
Washdown Autotuning Temperature Controllers
The faceplate on these controllers 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, which prevents objects about the size of a finger from coming into contact with a live circuit.
Because they have proportional-integral-derivative (PID) software, these controllers are ideal for turning heating equipment on and off in systems with rapid, unpredictable, and complex temperature changes. They help you achieve precise and stable temperature control with fuzzy logic that learns system behavior and automatically compensates for changes. Use the autotuning function to cycle and identify the ideal PID variables for your system to achieve the most precise control. These controllers read temperature with a highly sensitive thermocouple probe (sold separately) in critical process applications. All fit into instrument panels with DIN cutouts. Use the keypad to adjust the actuation point, reset point, and other settings.
Controllers with automatic reset switch off and on again automatically as the temperature fluctuates. Controllers with automatic/manual reset give you the choice to have machines turn back on either automatically when the temperature fluctuates, or you can manually reset their switch. When set to manual they shut down your machine when it gets too hot to protect equipment and personnel. They won’t turn the machine back on until you reset their switch. They have a second output to actuate an alarm or another simple device.
Mechanical relay outputs actuate circuits directly. Single pole, single throw (SPST) relays turn one circuit from off to on (normally open). 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).
Solid state relay outputs send a pulse signal to directly control an external solid-state relay (not included). They have a longer service life than mechanical and signal relays. Use them for more precise and rapid control switching than mechanical relays.
Analog signal outputs send 4-20 mA current to actuate equipment on a current loop. They are typically used with SRC (silicon controlled rectifier) power controllers (not included) for some of the highest precision control.
DIN-rail/surface-mount adapters (sold separately) mount 1/16 DIN controllers to a surface.
DIN cutout adapters (sold separately) convert larger cutouts to fit 1/16 DIN controllers.
For technical drawings and 3-D models, click on a part number.
Mechanical Relay | |||||||||
|---|---|---|---|---|---|---|---|---|---|
| Total No. of Outputs | Output Type | Industry Designation | Max. Switching Current @ Voltage | For Probe Type | Reset Type | Input Voltage Range | Environmental Rating | Each | |
1/32 DIN—For 7/8" × 1 3/4" Panel Cutout | |||||||||
| 1 | Heating—One Mechanical Relay | Heating—SPST-NO | Heating—3 A @ 220 V AC | Thermocouple | Automatic | 100V AC to 240V AC | IP20, IP66, NEMA 4X | 0000000 | 0000000 |
1/16 DIN—For 1 3/4" × 1 3/4" Panel Cutout | |||||||||
| 3 | Heating—One Mechanical Relay Alarm—Two Mechanical Relays | Heating—SPST-NO Alarm—SPST-NO | Heating—3 A @ 250 V AC Alarm—1 A @ 250 V AC | RTD, Thermocouple | Automatic, Manual | 100V AC to 240V AC | IP20, IP66, NEMA 4X | 0000000 | 000000 |
1/8 DIN—For 3 3/4" × 1 3/4" Panel Cutout | |||||||||
| 3 | Heating—One Mechanical Relay Alarm—Two Mechanical Relays | Heating—SPDT Alarm—SPST-NO | Heating—5 A @ 250 V AC Alarm—1 A @ 250 V AC | RTD, Thermocouple | Automatic, Manual | 100V AC to 240V AC | IP20, IP66, NEMA 4X | 0000000 | 000000 |
1/4 DIN—For 3 3/4" × 3 3/4" Panel Cutout | |||||||||
| 3 | Heating—One Mechanical Relay Alarm—Two Mechanical Relays | Heating—SPDT Alarm—SPST-NO | Heating—3 A @ 250 V AC Alarm—1 A @ 250 V AC | RTD, Thermocouple | Automatic, Manual | 100V AC to 240V AC | IP20, IP66, NEMA 4X | 0000000 | 000000 |
Mechanical Relay | |||||||||
|---|---|---|---|---|---|---|---|---|---|
| Total No. of Outputs | Output Type | Industry Designation | Max. Switching Current @ Voltage | For Probe Type | Reset Type | Input Voltage Range | Environmental Rating | Each | |
1/32 DIN—For 7/8" × 1 3/4" Panel Cutout | |||||||||
| 1 | Heating—One 15V DC Solid State Relay Drive | __ | __ | Thermocouple | Automatic | 100V AC to 240V AC | IP20, IP66, NEMA 4X | 0000000 | 0000000 |
1/16 DIN—For 1 3/4" × 1 3/4" Panel Cutout | |||||||||
| 3 | Heating—One 12V DC Solid State Relay Drive Alarm—Two Mechanical Relays | SPST-NO | 1 A @ 250 V AC | RTD, Thermocouple | Automatic, Manual | 100V AC to 240V AC | IP20, IP66, NEMA 4X | 0000000 | 000000 |
1/8 DIN—For 3 3/4" × 1 3/4" Panel Cutout | |||||||||
| 3 | Heating—One 12V DC Solid State Relay Drive Alarm—Two Mechanical Relays | SPST-NO | 1 A @ 250 V AC | RTD, Thermocouple | Automatic, Manual | 100V AC to 240V AC | IP20, IP66, NEMA 4X | 0000000 | 000000 |
1/4 DIN—For 3 3/4" × 3 3/4" Panel Cutout | |||||||||
| 3 | Heating—One 12V DC Solid State Relay Drive Alarm—Two Mechanical Relays | SPST-NO | 1 A @ 250 V AC | RTD, Thermocouple | Automatic, Manual | 100V AC to 240V AC | IP20, IP66, NEMA 4X | 0000000 | 000000 |
Mechanical Relay | |||||||||
|---|---|---|---|---|---|---|---|---|---|
| Total No. of Outputs | Output Type | Industry Designation | Max. Switching Current @ Voltage | For Probe Type | Reset Type | Input Voltage Range | Environmental Rating | Each | |
1/16 DIN—For 1 3/4" × 1 3/4" Panel Cutout | |||||||||
| 3 | Heating—One 4-20 mA Analog Signal Alarm—Two Mechanical Relays | SPST-NO | 1 A @ 250 V AC | RTD, Thermocouple | Automatic, Manual | 100V AC to 240V AC | IP20, IP66, NEMA 4X | 0000000 | 0000000 |
1/8 DIN—For 3 3/4" × 1 3/4" Panel Cutout | |||||||||
| 3 | Heating—One 4-20 mA Analog Signal Alarm—Two Mechanical Relays | SPST-NO | 1 A @ 250 V AC | RTD, Thermocouple | Automatic, Manual | 100V AC to 240V AC | IP20, IP66, NEMA 4X | 0000000 | 000000 |
1/4 DIN—For 3 3/4" × 3 3/4" Panel Cutout | |||||||||
| 3 | Heating—One 4-20 mA Analog Signal Alarm—Two Mechanical Relays | SPST-NO | 1 A @ 250 V AC | RTD, Thermocouple | Automatic, Manual | 100V AC to 240V AC | IP20, IP66, NEMA 4X | 0000000 | 000000 |
Mounting | ||||
|---|---|---|---|---|
| Fasteners Included | Screw Size | No. of Holes | Each | |
| No | No. 6 | 2 | 000000000 | 000000 |
On/Off Temperature Controllers for Plug-in Heaters
Switch heaters on or off when your process reaches a certain temperature. Both these controllers and your heater will be powered by the same wall outlet. Place the probe into your process, plug the controller into an outlet, and plug your heater into the socket on the back of the controller’s plug. These simple temperature controllers deliver either full power or no power. They’re best used in systems where temperatures change slowly and you don’t need precise control.
IP66 and NEMA 4X rated controllers seal out dirt, corrosive liquids, and water from high-pressure washdowns.
For technical drawings and 3-D models, click on a part number.
Mechanical Relay | Probe | |||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Temperature Control Range | No. of Outputs | Output Type | Industry Designation | Max. Switching Current @ Voltage | Reset Type | Dia. | Lg. | Cable Lg., ft. | Input Voltage | Ht. | Wd. | Dp. | Each | |
IP66 and NEMA 4X—Wall Mounting | ||||||||||||||
| -40° to 212° F -40° to 100° C | 1 | Heating—One Mechanical Relay | SPDT-NO | 12 A @ 120 V AC | Automatic | 1/4" | 2" | 6 | 120V AC | 6 5/8" | 2 13/16" | 2 13/16" | 0000000 | 0000000 |