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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 Flotec Pressure Switch is designed for use with submersible well pumps or as a replacement switch. The switch features a low-pressure cut-off for safety. For use with water-supply systems. For use with submersible well pumps or as a replacement switch. Turns on at 30 psi and off at 50 psi. Adjustable up to 40/60 psi or down to 20/40 psi. Includes low-pressure safety cutoff to shut off the pump when the system pressure drops to 10 psi.