Oil Pressure Drop Relay

Oil Pressure Drop Relay

This is a device designed to monitor a process pressure and provide an output when a set pressure (setpoint) is reached.
A pressure switch does this by applying the process pressure to a diaphragm or piston to generate a force which is compared to that of a pre-compressed range spring.
A pressure switch is used to detect the presence of fluid pressure.
Most pressure switches use a diaphragm or bellow as the sensing element.
The movement of this sensing element is used to actuate one or more switch contacts to indicate an alarm or initiate a control action.
Pressure switches have different designs with different sensing elements.
One of the most common is the one with diaphragms or bellows as the sensing elements
The one I will discuss here uses a piston as the pressure sensing element.
In any case, the operating principle for this piston type is the same with a diaphragm or bellow type pressure switch.

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