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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.
Quick Answer. Pressure transmitters, or pressure transducers, convert pressure into analog electrical signals. Input devices, called sensors, measure the quantity of identified mediums and convert the data through the use of output devices, called actuators. For example, pressure switches measure pressure and may use vibrations to convert pressure into analog electrical signals.