- A switch used to turn an electrical device on or off when a specified fluid pressure is reached. For example, a pressure switch in some hydraulic systems comes into operation when the hydraulic pressure drops to a cut-in pressure value. Pressure switches are also used in aircraft starting systems and engine-hour meters.
Aviation dictionary. 2014.
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pressure switch — Switch operated by a rise or drop in pressure. See oil pressure switch … Dictionary of automotive terms
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Pressure sensor — Digital air pressure sensor Compact digital barometric pressure sensor A pressure sensor measure … Wikipedia
pressure —  The force due to the weight of a substance exerted over the area the substance occupies. In metric measure, it is the force acting on each square metre. To calculate pressure, divide the force (in newtons) by the area (in square metres). It… … Dictionary of automotive terms
pressure differential switch — A hydraulic pressure operated switch (often included in a combination valve) which activates the brake failure warning light when one of the brake circuits (in a dual circuit system) falls due to a system leak and associated pressure drop … Dictionary of automotive terms
pressure sensing switch — Device, used on some late model GM and Ford vehicle, which cycles compressor operation in accordance with pressure changes sensed at the accumulator … Dictionary of automotive terms