Explosion-Proof Pressure Switches

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42 Products

About Pressure Switches

Built with an explosion-proof enclosure to meet NEMA 7 and 9 standards for hazardous locations, these switches were tested and verified by UL and CSA for use where explosive liquids, dust, and gas are present. When they reach the set pressure, they power equipment, signal controls, or trigger alarms. They’re single pole, double throw (SPDT) and can be installed to turn one circuit from off to on (normally open) or from on to off (normally closed). In addition to being UL listed and CSA certified, these switches are CE marked, so they also meet European safety standards.

All switches are IP and NEMA rated for use outdoors and protection from some corrosion, dust, and spraying water.

IP67 and NEMA 4X rated switches seal out water from temporary submersion and have increased protection against corrosion, similar to 304 stainless steel.

Wire Leads
	Setpoint, psi	Approximate Difference Between Setpoint and Reset Point, psi	Max. Continuous Pressure, psi	Accuracy	Max. Switching Current	Connection Material	For Use With	Environmental Rating		Each
1/4 NPT Male Pipe Connection
A	8-60	5	60	±5%	5 A @ 125 V AC 5 A @ 250 V AC	316 Stainless Steel	Air, Diesel Fuel, Gasoline, Hydraulic Fluid, Natural Gas, Water	NEC Class I Division 1 Groups A, B, C, D NEC Class II Division 1 Groups E, F ,G IP67 NEMA 4X NEMA 7 NEMA 9	00000000	0000000
A	10-100	9	100	±5%	5 A @ 125 V AC 5 A @ 250 V AC	316 Stainless Steel	Air, Diesel Fuel, Gasoline, Hydraulic Fluid, Natural Gas, Water	NEC Class I Division 1 Groups A, B, C, D NEC Class II Division 1 Groups E, F ,G IP67 NEMA 4X NEMA 7 NEMA 9	00000000	000000
A	20-200	16	200	±2%	5 A @ 125 V AC 5 A @ 250 V AC	316 Stainless Steel	Air, Diesel Fuel, Gasoline, Hydraulic Fluid, Natural Gas, Water	NEC Class I Division 1 Groups A, B, C, D NEC Class II Division 1 Groups E, F ,G IP67 NEMA 4X NEMA 7 NEMA 9	00000000	000000
A	50-500	60	500	±2%	5 A @ 125 V AC 5 A @ 250 V AC	316 Stainless Steel	Air, Diesel Fuel, Gasoline, Hydraulic Fluid, Natural Gas, Water	NEC Class I Division 1 Groups A, B, C, D NEC Class II Division 1 Groups E, F ,G IP67 NEMA 4X NEMA 7 NEMA 9	00000000	000000
A	100-1,000	87	1,000	±2%	5 A @ 125 V AC 5 A @ 250 V AC	316 Stainless Steel	Air, Diesel Fuel, Gasoline, Hydraulic Fluid, Natural Gas, Water	NEC Class I Division 1 Groups A, B, C, D NEC Class II Division 1 Groups E, F ,G IP67 NEMA 4X NEMA 7 NEMA 9	00000000	000000
A	200-2,000	165	2,000	±2%	5 A @ 125 V AC 5 A @ 250 V AC	316 Stainless Steel	Air, Diesel Fuel, Gasoline, Hydraulic Fluid, Natural Gas, Water	NEC Class I Division 1 Groups A, B, C, D NEC Class II Division 1 Groups E, F ,G IP67 NEMA 4X NEMA 7 NEMA 9	00000000	000000
1/2 NPT Female Pipe Connection
B	6-30	2	30	±1%	5 A @ 125 V AC 5 A @ 250 V AC	316 Stainless Steel	Air, Diesel Fuel, Gasoline, Hydraulic Fluid, Natural Gas, Water	NEC Class I Divisions 1, 2 Groups A, B, C, D NEC Class II Divisions 1, 2 Groups E, F, G IP66 NEMA 4 NEMA 7 NEMA 9	00000000	000000
B	12-60	2	60	±1%	5 A @ 125 V AC 5 A @ 250 V AC	316 Stainless Steel	Air, Diesel Fuel, Gasoline, Hydraulic Fluid, Natural Gas, Water	NEC Class I Divisions 1, 2 Groups A, B, C, D NEC Class II Divisions 1, 2 Groups E, F, G IP66 NEMA 4 NEMA 7 NEMA 9	00000000	000000
B	20-100	3.5	100	±1%	5 A @ 125 V AC 5 A @ 250 V AC	316 Stainless Steel	Air, Diesel Fuel, Gasoline, Hydraulic Fluid, Natural Gas, Water	NEC Class I Divisions 1, 2 Groups A, B, C, D NEC Class II Divisions 1, 2 Groups E, F, G IP66 NEMA 4 NEMA 7 NEMA 9	00000000	000000
B	40-200	6.5	200	±1%	5 A @ 125 V AC 5 A @ 250 V AC	316 Stainless Steel	Air, Diesel Fuel, Gasoline, Hydraulic Fluid, Natural Gas, Water	NEC Class I Divisions 1, 2 Groups A, B, C, D NEC Class II Division 1 Groups E, F ,G IP66 NEMA 4 NEMA 7 NEMA 9	00000000	000000
B	80-400	11	400	±1%	5 A @ 125 V AC 5 A @ 250 V AC	316 Stainless Steel	Air, Diesel Fuel, Gasoline, Hydraulic Fluid, Natural Gas, Water	NEC Class I Divisions 1, 2 Groups A, B, C, D NEC Class II Divisions 1, 2 Groups E, F, G IP66 NEMA 4 NEMA 7 NEMA 9	00000000	000000

Hazardous Location Differential Pressure Switches for Air

With an explosion-proof enclosure that meets NEMA 7 and 9 standards for hazardous locations, these switches were tested and verified by UL and CSA for use where explosive gas or dust may be present. Often used with ovens, dryers, and HVAC systems, they can indicate a filter is clogged or help maintain a certain air pressure. These switches turn equipment on and off, activate automated controls, or signal alarms when the differential pressure reaches your setpoint. They are single pole, double throw (SPDT) and can be installed to turn one circuit from off to on (normally open) or from on to off (normally closed).

In addition to being UL listed and CSA certified, these switches are CE marked and FM approved, so they also meet European safety standards. They also are IP and NEMA rated for use outdoors and protect against dust and splashing water.

When measuring pressure in ductwork, pair them with a static pressure probe.

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

Screw Terminals
Setpoint Range	Approximate Difference Between Setpoint and Reset Point	Max. Input Pressure	Accuracy	Max. Switching Current	Process Temp. Range, °F	Connection Material	For Use With	Environmental Rating		Each
1/8 NPT Female Pipe Connection
0.07-0.15 in. of H2O	0.13 in. of H2O	45 in. of H2O	±2%	15 A @ 125 V AC 15 A @ 250 V AC 15 A @ 480 V AC	-40° to 140°	Aluminum	Air	IP54; NEC Class I Divisions 1, 2 Groups C, D; NEC Class II Division 1 Groups E, F ,G; NEMA 3; NEMA 7; NEMA 9	0000000	0000000
0.15-0.5 in. of H2O	0.05 in. of H2O	45 in. of H2O	±2%	15 A @ 125 V AC 15 A @ 250 V AC 15 A @ 480 V AC	-40° to 140°	Aluminum	Air	IP54; NEC Class I Divisions 1, 2 Groups C, D; NEC Class II Division 1 Groups E, F ,G; NEMA 3; NEMA 7; NEMA 9	0000000	000000
0.4-1.6 in. of H2O	0.18 in. of H2O	45 in. of H2O	±2%	15 A @ 125 V AC 15 A @ 250 V AC 15 A @ 480 V AC	-40° to 140°	Aluminum	Air	IP54; NEC Class I Divisions 1, 2 Groups C, D; NEC Class II Division 1 Groups E, F ,G; NEMA 3; NEMA 7; NEMA 9	0000000	000000
1.4-5.5 in. of H2O	0.35 in. of H2O	45 in. of H2O	±2%	15 A @ 125 V AC 15 A @ 250 V AC 15 A @ 480 V AC	-40° to 140°	Aluminum	Air	IP54; NEC Class I Divisions 1, 2 Groups C, D; NEC Class II Division 1 Groups E, F ,G; NEMA 3; NEMA 7; NEMA 9	0000000	000000
3-11 in. of H2O	0.45 in. of H2O	45 in. of H2O	±2%	15 A @ 125 V AC 15 A @ 250 V AC 15 A @ 480 V AC	-40° to 140°	Aluminum	Air	IP54; NEC Class I Divisions 1, 2 Groups C, D; NEC Class II Division 1 Groups E, F ,G; NEMA 3; NEMA 7; NEMA 9	0000000	000000
4-20 in. of H2O	0.5 in. of H2O	45 in. of H2O	±2%	15 A @ 125 V AC 15 A @ 250 V AC 15 A @ 480 V AC	-40° to 140°	Aluminum	Air	IP54; NEC Class I Divisions 1, 2 Groups C, D; NEC Class II Division 1 Groups E, F ,G; NEMA 3; NEMA 7; NEMA 9	0000000	000000
0.5-2 psi	0.3 psi	35 psi	±2%	15 A @ 125 V AC 15 A @ 250 V AC 15 A @ 480 V AC	-40° to 140°	Aluminum	Air	IP54; NEC Class I Divisions 1, 2 Groups C, D; NEC Class II Division 1 Groups E, F ,G; NEMA 3; NEMA 7; NEMA 9	0000000	000000
1.5-8 psi	1 psi	35 psi	±2%	15 A @ 125 V AC 15 A @ 250 V AC 15 A @ 480 V AC	0° to 140°	Aluminum	Air	IP54; NEC Class I Divisions 1, 2 Groups C, D; NEC Class II Division 1 Groups E, F ,G; NEMA 3; NEMA 7; NEMA 9	0000000	000000
3-15 psi	0.9 psi	35 psi	±2%	15 A @ 125 V AC 15 A @ 250 V AC 15 A @ 480 V AC	0° to 140°	Aluminum	Air	IP54; NEC Class I Divisions 1, 2 Groups C, D; NEC Class II Division 1 Groups E, F ,G; NEMA 3; NEMA 7; NEMA 9	0000000	000000
4-25 psi	0.7 psi	35 psi	±2%	15 A @ 125 V AC 15 A @ 250 V AC 15 A @ 480 V AC	0° to 140°	Aluminum	Air	IP54; NEC Class I Divisions 1, 2 Groups C, D; NEC Class II Division 1 Groups E, F ,G; NEMA 3; NEMA 7; NEMA 9	0000000	000000
15-50 psi	1.25 psi	70 psi	±2%	15 A @ 125 V AC 15 A @ 250 V AC 15 A @ 480 V AC	0° to 140°	Aluminum	Air	IP54; NEC Class I Divisions 1, 2 Groups C, D; NEC Class II Division 1 Groups E, F ,G; NEMA 3; NEMA 7; NEMA 9	0000000	000000

Hazardous Location Differential Pressure Switches for Liquids

Tested and verified by UL and C-UL for use where explosive dust or gas are present, these switches have an explosion-proof enclosure that meets NEMA 7 and 9 standards for hazardous locations. They are often used to indicate a filter is clogged in a pump or cooling system. When the differential pressure reaches your setpoint, these switches can turn equipment on and off, activate automated controls, or signal alarms. They are single pole, double throw (SPDT) and can be installed to turn one circuit from off to on (normally open) or from on to off (normally closed).

In addition to being UL and C-UL listed, these switches are CE marked, so they also meet European safety standards. All switches are IP and NEMA rated for use outdoors and to protect against some corrosion, dust, and washdowns.

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

Screw Terminals
Setpoint Range	Approximate Difference Between Setpoint and Reset Point	Max. Input Pressure, psi	Accuracy	Max. Switching Current	Process Temp. Range, °F	Connection Material	For Use With	Environmental Rating		Each
1/4 NPT Female Pipe Connection
5-80 in. of H2O	2.5 in. of H2O	225	±0.5%	15 A @ 125 V AC 15 A @ 250 V AC 15 A @ 480 V AC 1 A @ 48 V DC 2 A @ 30 V DC 500 mA @ 125 V DC	-10° to 200°	Aluminum	Diesel Fuel, Gasoline, Hydraulic Oil (Petroleum Based), Water	IP66; NEC Class I Divisions 1, 2 Groups B, C, D; NEC Class II Divisions 1, 2 Groups E, F, G; NEMA 4X; NEMA 7; NEMA 9	0000000	0000000
2-20 psi	0.2 psi	225	±0.5%	15 A @ 125 V AC 15 A @ 250 V AC 15 A @ 480 V AC 1 A @ 48 V DC 2 A @ 30 V DC 500 mA @ 125 V DC	-10° to 200°	Aluminum	Diesel Fuel, Gasoline, Hydraulic Oil (Petroleum Based), Water	IP66; NEC Class I Divisions 1, 2 Groups B, C, D; NEC Class II Divisions 1, 2 Groups E, F, G; NEMA 4X; NEMA 7; NEMA 9	0000000	000000
3-30 psi	0.25 psi	225	±0.5%	15 A @ 125 V AC 15 A @ 250 V AC 15 A @ 480 V AC 1 A @ 48 V DC 2 A @ 30 V DC 500 mA @ 125 V DC	-10° to 200°	Aluminum	Diesel Fuel, Gasoline, Hydraulic Oil (Petroleum Based), Water	IP66; NEC Class I Divisions 1, 2 Groups B, C, D; NEC Class II Divisions 1, 2 Groups E, F, G; NEMA 4X; NEMA 7; NEMA 9	0000000	000000
10-100 psi	0.6 psi	225	±0.5%	15 A @ 125 V AC 15 A @ 250 V AC 15 A @ 480 V AC 1 A @ 48 V DC 2 A @ 30 V DC 500 mA @ 125 V DC	-10° to 200°	Aluminum	Diesel Fuel, Gasoline, Hydraulic Oil (Petroleum Based), Water	IP66; NEC Class I Divisions 1, 2 Groups B, C, D; NEC Class II Divisions 1, 2 Groups E, F, G; NEMA 4X; NEMA 7; NEMA 9	0000000	000000

Fixed-Setpoint Hazardous Location Flow Switches

Safe to use where flammable gases and combustible dust may be present, these switches activate or deactivate when your flow reaches a factory-set level. All are UL listed for hazardous environments. Because their set point is fixed, they’re ready to go, making them easy to install. They actuate when your flowing liquid or gas pushes their paddle into a set position. These switches are single pole, double throw (SPDT) and can turn one device from off to on (normally open) or from on to off (normally closed). They must be mounted horizontally to function accurately.

These switches are calibrated with water and air. They can also be used with other liquids and gases but may not measure accurately if their viscosity is significantly different.

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

			Set Point						Conduit
Pipe Size	Thread Type	Gender	For Liquids, gpm	For Gases, scfm	Max. Pressure	Temp. Range, °F	Voltage	Max. Switching Current	Trade Size	Thread Type	Gender	End-to-End Lg.		Each
Brass Body
1/2	NPT	Female	1.5	6.5	250 psi @ 70° F	-4° to 220°	120V AC/ 240V AC	5 A @ 120 V AC	3/4	NPT	Male	2 1/4"	00000000	0000000
3/4	NPT	Female	2	10	250 psi @ 70° F	-4° to 220°	120V AC/ 240V AC	5 A @ 120 V AC	3/4	NPT	Male	2 3/8"	00000000	000000
1	NPT	Female	3	14	250 psi @ 70° F	-4° to 220°	120V AC/ 240V AC	5 A @ 120 V AC	3/4	NPT	Male	2 1/2"	00000000	000000
1 1/4	NPT	Female	4	21	250 psi @ 70° F	-4° to 220°	120V AC/ 240V AC	5 A @ 120 V AC	3/4	NPT	Male	2 5/8"	00000000	000000
1 1/2	NPT	Female	6	33	250 psi @ 70° F	-4° to 220°	120V AC/ 240V AC	5 A @ 120 V AC	3/4	NPT	Male	2 7/8"	00000000	000000
2	NPT	Female	10	43	250 psi @ 70° F	-4° to 220°	120V AC/ 240V AC	5 A @ 120 V AC	3/4	NPT	Male	3"	00000000	000000
304 Stainless Steel Body
1/2	NPT	Female	1.5	6.5	2000 psi @ 70° F	-4° to 220°	120V AC/ 240V AC	5 A @ 120 V AC	3/4	NPT	Male	2 1/4"	00000000	000000
3/4	NPT	Female	2	10	2000 psi @ 70° F	-4° to 220°	120V AC/ 240V AC	5 A @ 120 V AC	3/4	NPT	Male	2 5/8"	00000000	000000
1	NPT	Female	3	14	2000 psi @ 70° F	-4° to 220°	120V AC/ 240V AC	5 A @ 120 V AC	3/4	NPT	Male	3"	00000000	000000
2	NPT	Female	10	43	2000 psi @ 70° F	-4° to 220°	120V AC/ 240V AC	5 A @ 120 V AC	3/4	NPT	Male	4 3/4"	00000000	00000000

Hazardous Location Flow Switches

UL listed for use where flammable gases or combustible dusts may be present, these flow switches activate or deactivate equipment when your flow rate reaches a set point. Use the adjustment screw to select their set point. They actuate when your flowing liquid or gas pushes their paddle into a certain position determined by the set point. All are single pole, double throw (SPDT) and can either turn one device from off to on (normally open) or on to off (normally closed). Mount them horizontally. Rated NEMA 4, they also protect against weather and washdowns.

These flow switches are calibrated with water and air. You can use them with other liquids and gases, but they may not measure accurately if the viscosity is different from water or air.

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

			Set Point						Conduit
Pipe Size	Thread Type	Gender	For Liquids, gpm	For Gases, scfm	Max. Pressure	Temp. Range, °F	Voltage	Max. Switching Current	Trade Size	Thread Type	Gender	End-to-End Lg.		Each
Brass Body
1/2	NPT	Female	0.04 to 0.75	0.18 to 2.7	1450 psi @ 70° F	-4° to 220°	120V AC/ 240V AC	5 A @ 120 V AC	3/4	NPT	Male	3 5/8"	00000000	0000000
304 Stainless Steel Body
1/2	NPT	Female	0.04 to 0.75	0.18 to 2.7	1450 psi @ 70° F	-4° to 220°	120V AC/ 240V AC	5 A @ 120 V AC	3/4	NPT	Male	3 5/8"	00000000	000000

Hazardous Location Insertion Flow Switches

Safely activate and deactivate equipment in environments with flammable gases and combustible dust when your flow rate reaches a set point. They are UL listed and CSA certified for use in hazardous locations. These switches save you from disassembling your pipeline because you insert them into pipe tees or pipe outlets instead of mounting them inline. They actuate when your system’s liquid pushes the paddle into a set position. To change your set point, the paddle has multiple layers that you can remove. For the lowest set point, use the largest paddle that will fit your pipe. To increase your set point, loosen the locking washers and remove paddles. You can trim the paddles to fine-tune your set point. The smaller the paddle, the higher the setpoint.

They should be mounted vertically into a horizontal pipeline, so liquid pushes the paddle.

These switches are calibrated with water and air. They can also be used with other liquids and gases but may not measure accurately if their viscosity is significantly different.

SPDT (singe pole, double throw) switches can turn one device from off to on (normally open) or from on to off (normally closed).

DPDT (double pole, double throw) switches can either turn two devices from off to on (normally open) or on to off (normally closed).

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

				Set Point Range		Max. Flow Rate					Conduit
Pipe Size	Thread Type	Gender	For Pipe Size	For Water and Oil, gpm	For Air and Inert Gas, scfm	For Water and Oil, gpm	For Air and Inert Gas	Max. Pressure	Temp. Range, °F	Max. Switching Current @ Voltage	Trade Size	Thread Type	Gender	Body Ht.		Each
SPDT
Brass Body
1 1/2	NPT	Male	1 1/2 2 4 12 20	3 to 7 4 to 15 12 to 95 140 to 900 400 to 2,400	17 to 32 13 to 65 50 to 400 800 to 3,450 2,850 to 10,000	55 97 391 3,525 9,792	Not Rated	1000 psi @ 70° F	-4° to 275°	5 A @ 125 V AC 5 A @ 250 V AC	3/4	NPT	Female	8"	00000000	0000000
316 Stainless Steel Body
1 1/2	NPT	Male	1 1/2 2 4 12 20	3 to 7 4 to 15 12 to 95 140 to 900 400 to 2,400	17 to 32 13 to 65 50 to 400 800 to 3,450 2,850 to 10,000	55 97 391 3,525 9,792	Not Rated	2000 psi @ 70° F	-4° to 275°	5 A @ 125 V AC 5 A @ 250 V AC	3/4	NPT	Female	8"	00000000	00000000
DPDT
Brass Body
1 1/2	NPT	Male	1 1/2 2 4 12 20	3 to 7 4 to 15 12 to 95 140 to 900 400 to 2,400	17 to 32 13 to 65 50 to 400 800 to 3,450 2,850 to 10,000	55 97 391 3,525 9,792	Not Rated	1000 psi @ 70° F	-4° to 275°	5 A @ 125 V AC 5 A @ 250 V AC	3/4	NPT	Female	8"	00000000	000000
316 Stainless Steel Body
1 1/2	NPT	Male	1 1/2 2 4 12 20	3 to 7 4 to 15 12 to 95 140 to 900 400 to 2,400	17 to 32 13 to 65 50 to 400 800 to 3,450 2,850 to 10,000	55 97 391 3,525 9,792	Not Rated	2000 psi @ 70° F	-4° to 275°	5 A @ 125 V AC 5 A @ 250 V AC	3/4	NPT	Female	8"	00000000	00000000

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About Pressure Switches

Hazardous Location Pressure Switches

Hazardous Location Differential Pressure Switches for Air

Hazardous Location Differential Pressure Switches for Liquids

Fixed-Setpoint Hazardous Location Flow Switches

Hazardous Location Flow Switches

Hazardous Location Insertion Flow Switches