Pneumatics Tools

How Does A Pressure Switch Work?   

jauhar khan
@jauhar123 | Posted 30 Aug. 2019

A pressure switch has one or two ports. In a pressure switch that has a single port, pressure enters through the port and hits an internal diaphragm. If the force entering into the port is higher than the force exerted by the pre-loaded set spring, the switch contacts will either make or break the circuit. This creates an alarm in the system and alerts the user that the pressure has changed within the environment.    

In a pressure switch with two ports, there is a comparison between the pressure entering the switch. If the pressure from one port is different from the pressure from the second port, then the pressure switch alerts the user with this change.

Back when solid-state pressure switches were introduced, they were a simple device which combined a triac switch and bonded strain gage sensor. At present, there are a wide range of solid-state pressure switches having one to four or more switch points, analog and digital outputs, digital displays, and full programmability. You could buy these switches from Switzer Pressure Switches

Solid-state pressure switches have a number of advantages over electromechanical switches, and they are:

  • Much longer cycle life.

  • High resistance to shock and vibration.

  • Improved accuracy to ±0.5%.

  • Broad frequency response.

  • The ability to handle a wide array of system pressures.

  • Great long-term stability.