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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.
Understanding Deadband for Pressure Switches. A pressure switch consists of a sensing component and an electrical switch. The switch opens and closes a contact at a specific pressure referred to as the set point. The set point may be fixed or adjustable. Selecting a pressure switch with a switch point in the proper operating pressure range is important to ensure accuracy and longevity.