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Deadband is also known as hysteresis and is the amount of a measured variable (pressure, temperature, etc.) between the point where a switch closes and then re-opens. It can be implemented is software if you have an analog input (i.e., open at 1.02 PSI, close at 0.98 PSI) or designed into a switching mechanism. Often the deadband of a switch is fixed and cannot be adjusted. A typical example is in a wall thermostat in your house.
Pressure Switch Definition. 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.