Hazardous Location Differential Pressure Switches

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Environment

For Use With

Petroleum-Based Hydraulic Oil

Water

System of Measurement

Pressure Set Point

0.07 in. H₂O to 0.15 in. H₂O

0.15 in. H₂O to 0.5 in. H₂O

0.4 in. H₂O to 1.6 in. H₂O

1.4 in. H₂O to 5.5 in. H₂O

3 in. H₂O to 11 in. H₂O

4 in. H₂O to 20 in. H₂O

5 in. H₂O to 80 in. H₂O

Pipe Size

Approximate Difference Between Set Point and Reset Point

Maximum Input Pressure

Measurement Unit

Pounds per Square Inch

Enclosure Rating

Connects To

Maximum Switching Current @ Voltage

Fitting Connection

Gender

Certification

Connection Material

Height

Width

Gasket Material

Hazardous Location Rating

NEC Class I Divisions 1, 2 Groups A, B, C, D

NEC Class I Divisions 1, 2 Groups B, C, D

NEC Class I Divisions 1, 2 Groups C, D

NEC Class I Division 2 Groups A, B, C, D

NEC Class II Divisions 1, 2 Groups E, F, G

NEC Class II Divisions 1, 2 Groups F, G

NEC Class II Division 2 Groups F, G

Thread Type

NPT

Housing Material

Aluminum

Brass

Export Control Classification Number (ECCN)

EAR99

RoHS

Compliant

Compliant with Exemptions

Not Compliant

DFARS Specialty Metals

REACH

Wire Connection

33 Products

Differential Pressure Switches with Dial Indicator for Liquids

To check the difference in pressure between two points, these switches have a dial indicator that shows differential pressure in real time. The dial indicator operates independently of the switch. You’ll sometimes see these switches used to indicate a filter is clogged in a pump or cooling system. When the differential pressure reaches your setpoint, they 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).

Rated NEMA 4X, these switches protect against dirt, washdown, and corrosion. They are also rated IP65 for protection from dust and rinsing. All are CSA certified, so they meet Canadian safety standards.

Screw Terminals
Setpoint	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
0-25 in. of H2O	5 in. of H2O	1,500	±2%	250 mA @ 120 V AC	-20° to 175°	Brass	Cleaning Solutions, Diesel Fuel, Gasoline, Hydraulic Fluid, Oil, Water	IP65; NEC Class I Division 2 Groups A, B, C, D; NEC Class II Division 2 Groups F, G; NEMA 4X	0000000	0000000
0-1 psi	0.2 psi	1,500	±2%	250 mA @ 120 V AC	-20° to 175°	Brass	Cleaning Solutions, Diesel Fuel, Gasoline, Hydraulic Fluid, Oil, Water	IP65; NEC Class I Division 2 Groups A, B, C, D; NEC Class II Division 2 Groups F, G; NEMA 4X	0000000	000000
0-5 psi	1 psi	1,500	±2%	250 mA @ 120 V AC	-20° to 175°	Brass	Cleaning Solutions, Diesel Fuel, Gasoline, Hydraulic Fluid, Oil, Water	IP65; NEC Class I Division 2 Groups A, B, C, D; NEC Class II Division 2 Groups F, G; NEMA 4X	0000000	000000
3-15 psi	3 psi	5,000	±2%	250 mA @ 120 V AC	-40° to 175°	Brass	Cleaning Solutions, Diesel Fuel, Gasoline, Hydraulic Fluid, Oil, Water	IP65; NEC Class I Division 2 Groups A, B, C, D; NEC Class II Division 2 Groups F, G; NEMA 4X	00000000	000000
6-30 psi	6 psi	5,000	±2%	250 mA @ 120 V AC	-40° to 175°	Brass	Cleaning Solutions, Diesel Fuel, Gasoline, Hydraulic Fluid, Oil, Water	IP65; NEC Class I Division 2 Groups A, B, C, D; NEC Class II Division 2 Groups F, G; NEMA 4X	00000000	000000
10-50 psi	10 psi	5,000	±2%	250 mA @ 120 V AC	-40° to 175°	Brass	Cleaning Solutions, Diesel Fuel, Gasoline, Hydraulic Fluid, Oil, Water	IP65; NEC Class I Division 2 Groups A, B, C, D; NEC Class II Division 2 Groups F, G; NEMA 4X	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 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, 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.

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.

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

Differential Pressure Transmitters with Dial Indicator for Liquids

For Use With: Diesel Fuel, Gasoline, Hydraulic Fluid, Water
Accuracy: ±2%
Pipe Connection: NPT Female
Housing Material: Brass
Connection Material: Brass
Temperature Range: -20° to 200° F

View readings at the source with the dial indicator or remotely using a receiver—these transmitters measure the difference in pressure between two inputs in liquid applications. The dial indicator operates independently of the transmitter and shows differential pressure in real time for troubleshooting. Also known as transducers, these transmitters convert pressure to an electrical signal that is interpreted by receiving devices, such as remote displays, programmable logic controllers, and motor speed controls. You’ll sometimes see them used to indicate a filter is clogged in a pump or cooling system. Rated NEMA 4X, these transmitters protect against dirt, washdown, and corrosion. They are also rated IP65 for protection from dust and rinsing. All are CSA certified, so they meet Canadian safety standards.

For your receiving device to interpret the signal from the transmitter, you will need to calibrate it for the transmitter's differential pressure range and output signal. As differential pressure increases, the output signal from the transmitter will increase. Transmitters will only provide accurate readings within the rated pressure range. Connect them using two wires. The same wire is used to send a signal to the receiver and to power the transmitter. Current doesn’t lose signal over long distances and isn’t affected by electrical interference from other devices.

					Mounting Holes
Differential Pressure Range	Max. Input Pressure, psi	Input Voltage	Pipe Size	Mounting Hardware Included	Dia.	No. of	Ht.	Wd.	Environmental Rating		Each
4-20 mA, 0-5V DC Output Signal—Screw Terminals
0-25 in. of H2O	1,500	9-35V DC	1/4	No	3/16"	2	2"	4 7/16"	IP65; NEC Class I Division 2 Groups A, B, C, D; NEC Class II Divisions 1, 2 Groups F, G; NEMA 4X	0000000	0000000
0-1 psi	1,500	9-35V DC	1/4	No	3/16"	2	2"	4 7/16"	IP65; NEC Class I Division 2 Groups A, B, C, D; NEC Class II Divisions 1, 2 Groups F, G; NEMA 4X	0000000	000000
0-5 psi	1,500	9-35V DC	1/4	No	3/16"	2	2"	4 7/16"	IP65; NEC Class I Division 2 Groups A, B, C, D; NEC Class II Divisions 1, 2 Groups F, G; NEMA 4X	0000000	000000
0-15 psi	5,000	9-35V DC	1/4	No	3/16"	2	2 5/8"	2 15/16"	IP65; NEC Class I Division 2 Groups A, B, C, D; NEC Class II Divisions 1, 2 Groups F, G; NEMA 4X	0000000	000000
0-30 psi	5,000	9-35V DC	1/4	No	3/16"	2	2 5/8"	2 15/16"	IP65; NEC Class I Division 2 Groups A, B, C, D; NEC Class II Divisions 1, 2 Groups F, G; NEMA 4X	0000000	000000
0-50 psi	5,000	9-35V DC	1/4	No	3/16"	2	2 5/8"	2 15/16"	IP65; NEC Class I Division 2 Groups A, B, C, D; NEC Class II Divisions 1, 2 Groups F, G; NEMA 4X	0000000	000000

Hazardous Location Easy-Setup Differential Pressure Transmitters

For Use With: Air, Diesel Fuel, Gasoline, Hydraulic Fluid, Water
Accuracy: ±0.075%
Pipe Connection: NPT Female
Housing Material: Aluminum
Connection Material: Hastelloy
Temperature Range: -40° to 185° F

Safe for use in environments where flammable gases and vapors are present, these transmitters measure the difference in pressure between two process lines without needing to program your receiving device to correct for errors. They meet NEC safety standards for protection against an explosion. These transmitters automatically compensate for errors caused by vibration and temperature changes. Set the pressure range with the keypad, select the unit of measure, and zero the transmitter. They convert differential pressure into an electrical signal that can be interpreted by receiving devices, such as remote displays, programmable logic controllers (PLCs), and motor speed controls, to monitor pressure or control equipment. You’ll often see them used to indicate a clogged filter or help maintain a certain pressure in heat exchangers, chillers, HVAC systems, and pumps. Rated IP66 and NEMA 4X, they protect against dirt, dust, corrosion, weather, and washdowns, and the hastelloy connection protects against harsh chemicals.

Transmitters will only provide accurate readings within the rated pressure range. Most often, these transmitters connect using two wires. The same wire that sends a signal to the receiver also powers the transmitter. Current doesn’t lose signal over long distances and isn’t affected by electrical interference from other devices. Three- and four-wire configurations are also possible.

					Mounting Holes
Differential Pressure Range	Max. Input Pressure, psi	Input Voltage	Pipe Size	Mounting Hardware Included	Dia.	No. of	Ht.	Wd.	Communication Protocol	Environmental Rating		Each
4-20 mA Output Signal—Screw Terminals
0-25 in. of H2O	3,625	11-55V DC	1/4	No	7/16"	8	7 7/8"	5 1/4"	HART	NEC Class I Divisions 1, 2 Groups A, B, C, D; IP66; NEMA 4X	0000000	000000000
0-200 in. of H2O	5,800	11-55V DC	1/4	No	7/16"	8	7 7/8"	5 1/4"	HART	NEC Class I Divisions 1, 2 Groups A, B, C, D; IP66; NEMA 4X	0000000	00000000
0-1,000 in. of H2O	5,800	11-55V DC	1/4	No	7/16"	8	7 7/8"	5 1/4"	HART	NEC Class I Divisions 1, 2 Groups A, B, C, D; IP66; NEMA 4X	0000000	00000000
0-150 psi	5,800	11-55V DC	1/4	No	7/16"	8	7 7/8"	5 1/4"	HART	NEC Class I Divisions 1, 2 Groups A, B, C, D; IP66; NEMA 4X	0000000	00000000
0-450 psi	5,800	11-55V DC	1/4	No	7/16"	8	7 7/8"	5 1/4"	HART	NEC Class I Divisions 1, 2 Groups A, B, C, D; IP66; NEMA 4X	0000000	00000000
0-1,500 psi	5,800	11-55V DC	1/4	No	7/16"	8	7 7/8"	5 1/4"	HART	NEC Class I Divisions 1, 2 Groups A, B, C, D; IP66; NEMA 4X	0000000	00000000