The pressure switch uses a high-precision, high-stability pressure sensor and transmission circuit, and then uses dedicated CPU modular signal processing technology to realize the detection, display, alarm and control signal output of the medium pressure signal. Pressure switches can be widely used in the measurement and control of gauge and absolute pressure of various gases and liquids in the fields of petroleum, chemical industry, metallurgy, electric power, water supply, etc. They are ideal intelligent measurement and control instruments for industrial sites. Pressure switches are widely used in the aerospace and military fields, such as the manufacturing of M1A1 tanks, Apollo spacecraft, Boeing 747, Airbus A320, F22, F117 and other products.