A pressure switch is one detecting the presence of fluid pressure. Pressure switches often use
diaphragms or bellows as the pressure-sensing element, the motion of which actuates one or more
switch contacts.
Recall that the “normal” status of a switch is the condition of minimum stimulus. A pressure
switch will be in its “normal” status when it senses minimum pressure (e.g. n applied pressure, or
in some cases a vacuum condition)1.
Pressure switch symbols
The following photograph shows two pressure switches sensing the same fluid pressure as an
electronic pressure transmitter (the device on the far left):
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