About Pressure Gauges
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About Pressure Transmitters
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About Air Preparation
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Low-Pressure Differential Gauges with Color Indicator
A band of green, yellow, and red provides a clear indication of changes in differential pressure. Gauges are commonly used to indicate clogged filters.

- For Use With: Air, Water, Hydraulic Fluid, Carbon Dioxide, Nitrogen, Hydrogen, Argon, and Acetylene
- Accuracy: ±5% Full Scale (Not Graded)
Pressure Range, psi | ||||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|
Pipe Size | Green Band | Yellow Band | Red Band | Max. Pressure, psi | Environment Temp. Range, °F | Process Temp. Range, °F | Ht. | Wd. | Dp. | Case Color | Each | |
NPT Female | ||||||||||||
1/4 | 0-2 | 2-2.5 | 2.5-3.5 | 300 | -40° to 200° | -40° to 200° | 3 1/4" | 3 1/4" | 1 1/2" | Black | 0000000 | 0000000 |
Medium-Pressure Differential Gauges

Popular for use with natural gas, these gauges measure pressure differences in pipelines and filters with a maximum pressure of 1,500 psi.
Gauges with 316 stainless steel case are more corrosion resistant than gauges with an aluminum case.
- For Use With: Water, Hydraulic Fluid, Gasoline, and Natural Gas
- Accuracy: ±2% Full Scale (Not Graded)
Available Pressure Ranges | ||
---|---|---|
Pressure Range, psi | Graduation Marks, psi | Numeric Increments, psi |
0 to 2 | 0.1 | 0.5 |
- For Use With: Water, Hydraulic Fluid, Gasoline, and Natural Gas
- Accuracy: ±2% Full Scale (Not Graded)
Available Pressure Ranges | ||
---|---|---|
Pressure Range, psi | Graduation Marks, psi | Numeric Increments, psi |
0 to 2 | 0.1 | 0.5 |
Differential Pressure Transmitters with Dial Indicator for Air

- For Use With: Air
- Accuracy: ±2%
- Pipe Connection: NPT Female
- Housing Material: Aluminum
- Connection Material: Aluminum
- Temperature Range: 20° to 120° F
Check the difference in air pressure between two inputs at the source using the dial indicator or remotely using a receiver. The dial indicator on these transmitters operates independently 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. They are often used to indicate a filter is clogged or help you maintain a certain air pressure in ovens, dryers, and HVAC systems. All are CE marked, so they meet European safety standards.
When measuring pressure in ductwork, pair them with a static pressure probe.
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 , in. of H2O | Max. Input Pressure, psi | Input Voltage | Pipe Size | For No. of Wires | Mounting Hardware Included | Thread Size | No. of | Dia. | Specifications Met | Each | |
4-20 mA Output Signal—Screw Terminals | |||||||||||
0-2 | 2 | 10-35V DC | 1/8 | 2 | No | 6-32 | 3 | 5 1/2" | CE Marked | 000000000 | 0000000 |
0-3 | 2 | 10-35V DC | 1/8 | 2 | No | 6-32 | 3 | 5 1/2" | CE Marked | 000000000 | 000000 |
0-10 | 2 | 10-35V DC | 1/8 | 2 | No | 6-32 | 3 | 5 1/2" | CE Marked | 000000000 | 000000 |
High-Accuracy Differential Pressure Transmitters

- For Use With: Air, Water
- Accuracy: ±0.25%
- Pipe Connection: NPT Female
- Housing Material: Aluminum
- Connection Material: 17-4 PH Stainless Steel
- Temperature Range: 0° to 175° F
At least twice as accurate as standard transmitters, these transmitters sense differential pressure at an accuracy of ±0.25%. Use them in laboratories or testing applications where the difference in pressure between two points needs to be measured with high accuracy. These transmitters are often used to indicate a filter is clogged or help you maintain a certain pressure in pumps, HVAC, cooling, and other air and liquid systems. They convert differential pressure to an electrical signal that can be interpreted by receiving devices, such as remote displays, programmable logic controllers, and motor speed controls to monitor pressure or control equipment. All transmitters are rated NEMA 4 for protection in washdown environments.
For your receiving device to interpret the signal from the transmitter, you will need to calibrate it for the pressure range and output signal of the transmitter. As the differential 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, psi | Max. Input Pressure, psi | Input Voltage | Pipe Size | Mounting Hardware Included | Dia. | No. of | Ht. | Wd. | Environmental Rating | Each | |
4-20 mA Output Signal—Screw Terminals | |||||||||||
0-2 | 350 | 9-30V DC | 1/4 | Yes | 5/32" | 4 | 3 1/8" | 2 7/16" | NEMA 4 | 0000000 | 000000000 |
Back-Pressure-Regulating Valves for Air and Inert Gas

- For Use With: Air, Inert Gas
- Temperature Range: 0° to 150° F
Often used to protect equipment running on air compressors, these valves obstruct flow to maintain sufficient operating pressure in your system. If the system pressure exceeds the set pressure, they exhaust through the unthreaded relief port. Adjust the set pressure within the range. Valves have two gauge ports.
Inlet | Outlet | Gauge Port | ||||||||
---|---|---|---|---|---|---|---|---|---|---|
Pipe Size | Location | Max. Pressure, psi | Pipe Size | Location | Pipe Size | Location | End-to-End Lg. | Outlet Pressure Range, psi | Each | |
NPT Female | ||||||||||
Aluminum Body—Buna-N Diaphragm and Seal | ||||||||||
1/4 | Side | 250 | 1/4 | Side | 1/4 | Side | 3" | 0 to 2 | 0000000 | 0000000 |
3/8 | Side | 250 | 3/8 | Side | 1/4 | Side | 3" | 0 to 2 | 0000000 | 000000 |
1/2 | Side | 250 | 1/2 | Side | 1/4 | Side | 3" | 0 to 2 | 0000000 | 000000 |
High-Flow Precision Compressed Air Regulators
With a greater flow capacity than our standard precision compressed air regulators, use these regulators to adjust and maintain air pressure in sensitive high-flow applications where constant, consistent pressure is important. Install in your air line after filters.
Relieving regulators exhaust when the downstream pressure exceeds the set pressure.
Nonrelieving regulators do not exhaust excess downstream pressure.
BSPP threads are also known as G threads.
Pressure gauges are for use with regulators with NPT threading.
Mounting brackets (sold separately) allow you to attach the regulator to a wall or equipment.


Regulators | ||||||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Pipe Size | Overall | Mounting Brackets | ||||||||||||
Inlet | Outlet | Max. Flow Rate | Max. Pressure, psi | Gauge Included | No. of Gauge Ports | Wd. | Ht. | Max. Temp., °F | Regulating Accuracy | Pressure Regulating Range, psi | Each | Each | ||
Aluminum Housing—BSPP Female Inlet and Outlet | ||||||||||||||
Relieving | ||||||||||||||
1/4 | 1/4 | 80 scfm @ 100 psi | 250 | No | 2 | 3" | 6 1/8" | 160° | ±0.05% | 0-2 | 00000000 | 0000000 | 000000 | 000000 |
3/8 | 3/8 | 80 scfm @ 100 psi | 250 | No | 2 | 3" | 6 1/8" | 160° | ±0.05% | 0-2 | 00000000 | 000000 | 000000 | 00000 |
1/2 | 1/2 | 80 scfm @ 100 psi | 250 | No | 2 | 3" | 6 1/8" | 160° | ±0.05% | 0-2 | 00000000 | 000000 | 000000 | 00000 |
Nonrelieving | ||||||||||||||
1/4 | 1/4 | 80 scfm @ 100 psi | 250 | No | 2 | 3" | 6 1/8" | 160° | ±0.05% | 0-2 | 00000000 | 000000 | 000000 | 00000 |
Aluminum Housing—NPT Female Inlet and Outlet | ||||||||||||||
Relieving | ||||||||||||||
1/4 | 1/4 | 80 scfm @ 100 psi | 250 | No | 2 | 3" | 6 1/8" | 160° | ±0.05% | 0-2 | 000000 | 000000 | 000000 | 00000 |
3/8 | 3/8 | 80 scfm @ 100 psi | 250 | No | 2 | 3" | 6 1/8" | 160° | ±0.05% | 0-2 | 000000 | 000000 | 000000 | 00000 |
1/2 | 1/2 | 80 scfm @ 100 psi | 250 | No | 2 | 3" | 6 1/8" | 160° | ±0.05% | 0-2 | 000000 | 000000 | 000000 | 00000 |
1/2 | 1/2 | 225 scfm @ 100 psi | 250 | No | 2 | 4" | 7 5/8" | 200° | ±0.1% | 0-2 | 00000000 | 000000 | 00000000 | 00000 |
Nonrelieving | ||||||||||||||
1/4 | 1/4 | 80 scfm @ 100 psi | 250 | No | 2 | 3" | 6 1/8" | 160° | ±0.05% | 0-2 | 00000000 | 000000 | 000000 | 00000 |
1/2 | 1/2 | 80 scfm @ 100 psi | 250 | No | 2 | 3" | 6 1/8" | 160° | ±0.05% | 0-2 | 00000000 | 000000 | 000000 | 00000 |
3/4 | 3/4 | 250 scfm @ 100 psi | 250 | No | 2 | 4" | 7 5/8" | 200° | ±0.1% | 0-2 | 00000000 | 000000 | 00000000 | 00000 |