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Pressure Switch Terms

Accuracy – A limit of how much deviation from the switch set point is allowed, measured in points per square inch or as a percentage.
 
Actuation Point/Setpoint – The exact pressure that actuates the snap-action switch to either open or close the circuit.
 
Actuation Value/Deadband – In a pressure actuated switch, the differentiation between the actuation point and the re-actuation point.
 
Adjustable Range/Working Pressure – The range of pressure a switch encounters under normal conditions.
 
Ambient Pressure – Pressure that surrounds a pressure switch.
 
Differential – While a switch element reverses itself, the amount of mechanical motion that is lost.
 
Differential Pressure – The difference between a reference point and the actual pressure value.
 
Electrical Switching Element – A device that will open or close an electrical circuit when prompted by the pressure sensing element.
 
Flow Meter – A device that measures the quantity of product flowing through it. (http://www.flow-meters.biz)
 
Hysteresis – The difference of a switch’s response to increasing and decreasing pressure.
 
Pressure Gauge – A device which measures the pressure built up in a closed system. (http://www.pressure-gauges.com)
 
Pressure Sensing Element – The part of the element that is moved when pressure is changed.
 
Pressure Transducer – A device that converts pressure into an analog electrical signal. (http://www.pressure-transducers.net)
 
Repeatability – The measured consistency and accuracy of a pressure switch to operate at its setpoints.
 
Solenoid Valve – A valve that uses a solenoid to control the valve. (http://www.solenoid-valves.net)
 
Snap-Action Switch – A fast transfer of contacts from one site to another. They can quickly open or close a circuit.
 
Variable Pressure – The changing pressure that activates the pressure switch.