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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.
The Stewart Warner Hobbs Pressure Switch with part #78628 is a single circuit pressure switch that features a N.O. (normally open) circuitry with a 1 PSI factory set point. This pressure switch also comes with glass reinforced polyester cover, brass base and 2 screw terminal. It is specifically designed to stand up to extended duty applications.