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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.
Each pressure sensing element of the Adjustable. Dead Band pressure switch is a force balance piston-actuated assembly sealed by a flexible diaphragm and. an o-ring that is static. The only wetted parts are the single pressure port, two diaphragms, and two o-rings all. indicated with asterisks (*) in this illustration.