There are two main types of pressure switches: mechanical pressure switches and electronic pressure switches.

Mechanical pressure switch:

These switches are simple and sturdy, and are typically used for less complex tasks. Mechanical pressure switches are triggered by springs and pistons to control the pressure at which they are activated. A spring is a force opposite to the inlet pressure, and its tension is adjusted by a fixed screw or knob. Conversely, the pre tightening force of the spring is directly related to the pressure at which electrical contact occurs. In the event of a pressure drop, the switch will reset to its original state. Compared to electronic pressure switches, mechanical pressure switches are more suitable for handling high voltages and amperes. You can use them to increase or decrease stress through contact changes.

Electronic pressure switch:

The electronic pressure switch includes a pressure sensor, usually a strain gauge, and an additional electronic device that converts the signal into a readable output. Compared to mechanical pressure switches, electronic pressure switches have many advantages. Some advantages include higher accuracy, less contact wear, excellent long-term stability, simple operation, and the ability to perform thousands of switching cycles.

A pressure switch is a mechanical or electronic device that is activated when the pressure of the process fluid reaches a certain threshold or set point. The pressure switch may vary depending on whether it is composed of a Bourdon tube, piston, diaphragm, or membrane, which will move or deform depending on the degree of pressure applied by the system. For example, a gas pressure switch is used to maintain a constant pressure and can turn off the compressor when the storage tank reaches the desired gas pressure level. If the air pressure drops and more air pressure is needed, the switch can also turn on the compressor.

Pressure switches should not be confused with pressure sensors. The latter converts pressure into an electrical output signal.

The pressure switch consists of the following key components:

Diaphragm -The diaphragm is used to detect pressure. This material is usually flexible and sensitive to pressure.

Spring——Used to adjust the set point or cutoff point.

Levers -Used to activate or deactivate switches.

Electrical contacts -Allow current to pass through them from external power sources.

Terminals——Connect the external power supply to the contacts.

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