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