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About Pressure Switches
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Differential Pressure Switches for Air
Pipe Connection
Often used with ovens, dryers, and HVAC systems, these switches detect small differences in air pressure to indicate a filter is clogged or help you maintain a certain air pressure. 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). All meet at least one safety standard.
When measuring pressure in ductwork, pair them with a static pressure probe.
| Setpoint, in. of H2O | Approximate Difference Between Setpoint and Reset Point, in. of H2O | Max. Input Pressure | Accuracy | Max. Switching Current  | Process Temp. Range, ° F | Connection Material | For Use With | Each | |
Screw Terminals | |||||||||
|---|---|---|---|---|---|---|---|---|---|
1/8 NPT Female Pipe Connection | |||||||||
| 0.07-0.15 | 0.04 | 45 in. of H2O | ±3% | 15 A @ 120 V AC 15 A @ 240 V AC 15 A @ 480 V AC | -30° to 180° | Aluminum | Air | 00000000 | 000000 |
| 0.15-0.55 | 0.1 | 45 in. of H2O | ±3% | 15 A @ 120 V AC 15 A @ 240 V AC 15 A @ 480 V AC | -30° to 180° | Aluminum | Air | 00000000 | 00000 |
| 0.4-1.6 | 0.16 | 45 in. of H2O | ±3% | 15 A @ 120 V AC 15 A @ 240 V AC 15 A @ 480 V AC | -30° to 180° | Aluminum | Air | 00000000 | 00000 |
| 1.4-5.5 | 0.3 | 45 in. of H2O | ±3% | 15 A @ 120 V AC 15 A @ 240 V AC 15 A @ 480 V AC | -30° to 180° | Aluminum | Air | 00000000 | 00000 |
| 3-11.75 | 0.4 | 45 in. of H2O | ±3% | 15 A @ 120 V AC 15 A @ 240 V AC 15 A @ 480 V AC | -30° to 180° | Aluminum | Air | 00000000 | 00000 |
| 4-20 | 0.5 | 45 in. of H2O | ±3% | 15 A @ 120 V AC 15 A @ 240 V AC 15 A @ 480 V AC | -30° to 180° | Aluminum | Air | 00000000 | 00000 |
| 5-44 | 0.83 | 10 psi | ±2% | 15 A @ 120 V AC 15 A @ 240 V AC 15 A @ 480 V AC | -20° to 180° | Steel | Air | 00000000 | 000000 |
| 9-85 | 2.15 | 10 psi | ±2% | 15 A @ 120 V AC 15 A @ 240 V AC 15 A @ 480 V AC | -20° to 180° | Steel | Air | 00000000 | 000000 |