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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.
How to Correct. Wrong pressure switch setting or setting 'drift'. Lower switch setting. If pump shuts off, this was the trouble. Adjust switch to proper setting. Defective pressure switch. Arcing may have caused switch contacts to 'weld' together in closed position.Examine points and other parts of switch for defects.Replace switch if defective.rong pressure switch setting or setting 'drift'. Lower switch setting. If pump shuts off, this was the trouble. Adjust switch to proper setting. Defective pressure switch. Arcing may have caused switch contacts to 'weld' together in closed position.