A pressure responsive switch senses a change in pressure and responds to such changes by alternately making and eaking an electrical connection. Pressure-sensitive switches are used in a variety of appcations where it is desired to switch apparatus on or off at predetermined pressures. These switches are utized in a wide variety of appcations, as environmental appcations. Pressure switches include set-point pressure switches that actuate when a specified pressure is reached and pressure measuring switches that are capable of measuring the ambient pressure and reacting accordingly. A pressure responsive switch generally comprises a diaphragm responsive to a pressure change, a rigid ring for securing the diaphragm, and a pair of electrically conductive contacts that eak contact based on movement of the diaphragm. Mechanical pressure switches typically provide an output signal in the form of a switch closure in response to appcation of mechanical or atmospheric pressure. A differential is a device which utizes differential fluid pressure from low and high pressure sources to actuate an electric switch at a pre-set actuation point. Differential pressure switches are commonly employed to control the operation of snap action switches.
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