A pressure switch is simply a device that reacts to the changing pressure in a system and either opens or closes a circuit to cause an action in response to the changing pressure in the system.As it reacts to the pressure change in a compressed air system, the pressure switch either allows or drops an outgoing signal that is used to initiate an action.
In the case of our air compressor, the action is to turn on or turn off the electric motor of the air compressor.You will not normally need to try to adjust the pressure settings of your pressure switch.