Stainless steel diaphragm pressure gaugeIt is mainly used to measure the pressure of liquids, gases, or granular solid media with high viscosity, easy crystallization, high corrosiveness, and high temperature. Generally speaking, isolation membranes are made of various materials to adapt to different corrosive media. The working principle of stainless steel diaphragm pressure gauge is as follows: the diaphragm deforms under the pressure of the measured medium, and the sealing liquid is pressurized, forming a pressure equivalent to P, which is transmitted to the pressure instrument and displays the pressure value of the measured medium.
Introduction to the Four Characteristics of Stainless Steel Diaphragm Pressure Gauge:
1. For the selection of sealing fluid
In order to ensure the safety and reliability of stainless steel diaphragm pressure gauges, in practical operation, we should pay attention to selecting suitable and sealing liquids according to different purposes.
2. Good corrosion resistance
Stainless steel diaphragm pressure gaugeThe corrosion resistance can be ensured by selecting appropriate materials for the diaphragm, flange, and sealing ring in contact with the measuring medium.
3. Diaphragm gauge liquid level difference
For diaphragm pressure gauges with flexible connecting pipes, the installation position of the pressure receiving part is different from that of the universal pressure gauge, which will result in the influence of the liquid level difference △ P as shown in the figure.
4. Temperature characteristics
Due to the fact that the stainless steel diaphragm pressure gauge is filled with sealing liquid as the medium for transmitting pressure, the temperature expansion coefficient of the sealing liquid causes the reading of the pressure instrument to increase as the temperature of the compressed part rises. The temperature effect is related to the expansion coefficient of the sealing liquid, the stiffness of the diaphragm, and the temperature of the compressed part, especially for low range pressure instruments, the impact is more significant. The temperature error of a compressed section is specified to be no more than 0.1%/℃. Therefore, the overall temperature impact of diaphragm pressure instruments is generally the sum of the temperature impact of general-purpose instruments and the temperature impact of the compressed part of the diaphragm device.
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