Main technical parameters of SC series diaphragm pressure gauges

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Key Technical Parameters of SC Series Diaphragm Pressure Gauges Overview To expand the application range of various general-purpose pressure instruments, and to enable the measurement of pressures in media that are highly corrosive, at high temperatures, with high viscosity, prone to crystallization or solidification, or containing suspended solids, as well as in situations where certain measurement media cannot directly enter conventional instruments and where it is necessary to facilitate cleaning and prevent the accumulation of deposits, it is necessary to use diaphragm gauges that consist of a diaphragm separator in combination with a general-purpose pressure instrument. At Boyi Pneumatic, we also strive to develop better technologies as times progress; our diaphragm pressure gauges are suitable for extreme environments, and their specific parameters can be customized according to customer requirements. 　　Diaphragm gauges are primarily used for pressure measurement during the production processes in industries such as petroleum, chemicals, pharmaceuticals, food, and light textiles. 　　Structural principle: The diaphragm pressure gauge consists of various general-purpose pressure instruments and a diaphragm isolator with a different structure, forming a closed system filled with a sealing fluid. When the pressure of the medium under test acts on the diaphragm, the diaphragm deforms, compressing the sealing fluid in the closed system. Due to the inherent properties of the sealing fluid, the elastic elements in the pressure gauge undergo corresponding elastic deformation and displacement, which allows the pressure value to be displayed through the indicating device. When the stiffness of the diaphragm is low enough, the pressure indicated by the pressure gauge is close to the pressure of the medium being measured. Below are the parameters of the BOYI diaphragm pressure gauge; for more information, search for: Tianjin Boyi Pneumatic. 　　Main technical parameters ◆ Accuracy: ±1.5%. ◆Testing medium: Highly corrosive, high-viscosity fluids. ◆ Diaphragm material: FEP or neoprene, Monel. ◆ Gasket material: Please contact us to determine the appropriate gasket material based on the properties of the testing medium. ◆ Sealing fluid: Silicone oil, glycerin aqueous solution, or ethyl acetate (optional). ◆ Installation type: Direct type, remote transmission type. ◆ Temperature characteristics of the diaphragm gauge: Since the system of the diaphragm gauge is filled with a sealing fluid for pressure transmission and as a medium, the temperature influence on the diaphragm gauge is related to the expansion coefficient of the sealing fluid, the stiffness of the diaphragm, and the temperature at the compressed area. The impact is particularly evident on pressure instruments with low ranges. Generally, the temperature error in the compressed area is specified to be no more than 0.1%/°C; therefore, the temperature influence on the diaphragm surface is typically the sum of the temperature influence from conventional pressure instruments and the temperature influence from the compressed area of the diaphragm isolator. 　　◆Corrosion resistance of diaphragm meters: The corrosion resistance of diaphragm meters can be ensured by appropriately selecting the materials for the diaphragm, flanges, and sealing gaskets that come into contact with the medium being measured. 　　◆Diaphragm material: FEP or neoprene, Monel. ◆ Flange material: Stainless steel (316). 　　◆Seal gasket material: For determining the appropriate material for the gasket, please contact us based on the properties of the medium to be tested.
◆ Selection of diaphragm fluid
To ensure reliable and safe operation of the diaphragm, it is necessary to choose an appropriate sealing fluid depending on the intended use.

Sealing fluid | Temperature range of the compressed area | Specific gravity (g/cm3) | Coefficient of thermal expansion (1/°C) | Application
High-viscosity silicone oil | -10～200°C | 1.07 | 0.95×10-3 | For high-temperature applications
Low-viscosity silicone oil | -30～100°C | 0.94 | 1.08×10-3 | For general use
Aqueous solution | -5～100°C | 1.27 | 0.61×10-3 | For food-related applications