What Are Pressure Switches? What Are Its Types?

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A pressure switch is an electrical device that is used to measure the pressure in any given environment. It indicates when a system has reached a certain pressure or has lost pressure depending on the limit set by the user. Switzer is a dealer of all the types of pressure switches that you can purchase from according to your requirement.

How Does A Pressure Switch Work?

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.

Applications and environments for pressure switches

Pressure switches are used in many industries including, Agriculture, Medical, Marine, Motorsport,  Defence, and various others. Some of the specific applications for pressure switches include:

  • DNA sampling machinery
  • Monitoring oxygen pressure levels in hospitals and on medical devices
  • Drink dispensing equipment and coffee machines
  • Indicating blocked filters on fans and kitchen extraction units
  • Agricultural crop dusting machinery
  • Filtration systems in aquariums
  • Activation/alarm inside breathalyzers and medical equipment

What Are The Different Types of Pressure Switches?

A pressure switch, in its simplest form, is a device which is capable of detecting a pressure change and, at a decided level, opening or closing an electrical contact. Pressure switches fall into three basic classifications: solid state, electromechanical, and electronic. Pressure switches have been electromechanical devices traditionally. However, today, inroads into this old technology are being made by solid-state devices and the new type of electronic pressure switches.

Electromechanical Pressure Switches

The most common electromechanical pressure switches are made of a sensing element and an electrical snap-action switch. Many different types of sensing elements can be used, but they have one thing in common, which is that they move in response to the changes taking place in the system pressure. They directly act on the opening, through their movement, as well as the closing of the snap-action switch’s contacts.

Switches are commonly grouped based on the type of sensor technology utilized. The properties of the sensor tend to define the relative accuracy and life one can expect from the switch.

Solid-State Pressure Switches

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.


BPS3000 Electronic Dual Pressure Switch

Around two decades after pioneering the solid-state pressure switch the next game-changer, the BPS3000 Electronic Dual Pressure Switch has been introduced. This digital pressure switch represents the next step in the pressure switch evolution and features some very impressive attributes.

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