A mechanical pressure switch generally operates through a mechanical force-balance principle.
Its typical operating process includes:
Pressure Input: The process medium enters the pressure connection and applies pressure to the internal sensing element.
Mechanical Movement: Pressure generates a force that acts against a preset spring force.
Switch Activation: When the pressure force reaches the configured switching threshold, the internal mechanism actuates the electrical contacts.
Signal Output: The contacts open or close, sending a switching signal to a control circuit.
Pressure Reset: When pressure changes back to the reset threshold, the contacts return to their original state.
The difference between the activation pressure and reset pressure is known as hysteresis or switching differential. It helps prevent excessive switching caused by small pressure fluctuations.
The exact internal construction depends on the pressure switch design and model. WIKA blog +2
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