Differential Pressure Switches in HVAC

Mohd Abdul Mujeeb Khan (PMP®, MBA, B.Tech)

Deputy Manager Business Development & Sales - Regional & International Consultants

Published Dec 14, 2021

What Are Differential Pressure Switches ?

Differential Pressure Switches. They sense the difference in pressure between these two measured points.

These switches have two ports connected to the two different pressure sources. The differential pressure switch follows the pressure between the two places.

If the pressure reaches a particular point, then the internal diaphragm in the switch will make contact after deflecting. This contact will either make or break a circuit. The change in the circuit will trigger an alarm that tells the user that the pressure has changed.

Users can pre-set the setpoint on the pressure switch or they can adjust it in the field.

Differential pressure is essentially the difference in pressure between two given points. It is a type of pressure measured within different industries using differential pressure sensors.

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