Principle and Application of Diaphragm Pressure Gauges

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When measuring the pressure of a medium, the working principle of a diaphragm pressure gauge is to use a separating device surrounding the pressure gauge. The pressure of the medium is transmitted to the internal pressure gauge through the sealing fluid, resulting in an indicated value. It is characterized by operating in a manner that uses dielectric isolation. A diaphragm pressure gauge consists mainly of the pressure gauge itself and a specialized isolation device; it is a special type of pressure gauge used for measuring specific media. It can measure media with strong corrosivity, high temperatures, and high viscosity. Currently, diaphragm pressure gauges are widely used in various fields such as petroleum, chemicals, chemical fibers, and pharmaceuticals, where measurements of fluids with special properties are required. They find extensive application in the field of industrial production. Especially in high-temperature and highly corrosive working environments, diaphragm pressure gauges play a crucial role. Due to the presence of a specialized isolation mechanism, diaphragm pressure gauges prevent the accumulation of substances within the medium inside the gauge; as a result, they can be used to measure liquid media that are prone to crystallization, solidification, or contain solid particles. However, diaphragm pressure gauges also have certain disadvantages, as they rely on a sealing fluid to transmit pressure. Therefore, the self-expansion of the sealing fluid at high temperatures affects the reading on the pressure gauge; as the temperature rises, the pressure sensed by the gauge increases, and this effect is more pronounced in diaphragm pressure gauges with a low range. 　　Diaphragm pressure gauges can cope with various harsh measurement environments; they operate in isolation from the medium, and boast features such as high accuracy, a wide measurement range, numerous selection options, and diverse internal structures