Mechanical pressure switches sense the pressure changes and respond by alternately breaking and making an electrical connection. Pressure sensitive switches are used in a wide range of applications when it is necessary to switch the apparatus on or off at predetermined pressures. Some applications of pressure switches include aircraft, automobiles and many other environments.
Mechanical pressure switches include a set-point pressure switch that gets activated after reaching a specified pressure. The pressure measuring switches can easily measure the ambient pressure and react accordingly. These mechanical pressure switches generally comprise of a diaphragm that responds to changes in pressure, a rigid ring to secure the diaphragm and electrically conductive contacts that break the contact depending on the movement of the diaphragm.
Types of mechanical pressure switches
The output signal offered by mechanical pressure switches inform about the atmospheric or mechanical pressure. Differential pressure switches are devices that use differential fluid pressure from low and high pressure sources to activate an electric switch that is pre-set at an activation point. The differential pressure switches are usually used for controlling the operation of snap action switches.
Mechanical pressures can have a solid-state or electro-mechanical construction. The normal state mechanical pressure switch can be normally closed (NC) or normally open (NO). These pressure switches can have single poles (SP), double poles (DP) and more than two poles. On the other hand, the throw type on pressure sensors can be double throw (DT) or single throw (ST).
When purchasing pressure switches, switched current, switched DC volts and switched AC volts are some electrical characteristics you need to consider.
