Differential Pressure Switches
Differential pressure switches utilize a differential air pressure to actuate an electric switch at a particular actuation point. Differential pressure is the difference between a reference point and the actual pressure value; it may be the difference between two positive or two negative pressures, one of each, or a positive or negative with atmospheric pressure. Differential pressure switches are devices that measure or regulate two points of differing pressure and then actuate. If the relative pressure of the two points is the same, no pressure measurement is shown. Differential pressure occurs only when there is a difference between a reference point and the actual pressure value.
Differential pressure is one of the several types of measurement ranges that are available for pressure switches. A differential switch can be used for opening or closing dampers or louver, sounding alarms, lighting signals, starting and stopping fans or motors, and many other uses.
Differential pressure switches are available in many forms, such as sensors, chips, transducers, meters, gauges, or controllers. They are able to operate during gas, electric current, and liquid pressure situations, individually or in combination. When a differential pressure switch is actuated, it will open or close to interrupt or continue the flow or current involved.