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A pressure switch is a form of switch that closes an electrical contact when a certain set fluid pressure has been reached on its input. The switch may be designed to make contact either on pressure rise or on pressure fall. Pressure switches are widely used in industry to automatically supervise and control systems that use pressurized fluids.

Another type of pressure switch detects mechanical force; for example, a pressure-sensitive mat is used to automatically open doors on commercial buildings. Such sensors are also used in security alarm applications such as pressure sensitive floors.



Mechanical pressure switches – standard

If, with a mechanical pressure switch, the defined pressure is reached and the switch is actuated, the switch will send an electrical signal. For this, it needs no auxiliary power. The resulting reliability is one of the advantages of mechanical pressure switches.

Pressure switches are fitted with high-quality micro switches. They feature high long-term stability and precision. Even the switching of electrical loads up to 15 A/220 V is possible without problems with a mechanical pressure switch.

Electronic pressure switches

An electronic pressure switch is based on an electronic pressure sensor. Along with the electrical signal for switching the electrical circuit, many electronic pressure switches offer an additional analogue signal proportional to the pressure. Thus, not only is it identified whether the defined switch point has been reached, but the actual measured pressure is transmitted. Electronic pressure switches often feature a display from which the measured pressure can be read, while flexible settings and programming are also possible. Switch points, output signal, delay time, hysteresis and many other parameters can be individually adjusted to suit the application.

  • Well water pumps
  • Electronic gas compressors
  • In-cell charge control inside a battery
  • Activating an alarm if aircraft cabin pressure drops
  • Pressure panels on sliding doors
  • Switching high currents, e.g., pumps and drives

Source : Wikipedia, Wika

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