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Industry Information
Diaphragm pressure gauge characteristics and advantages
2011-12-21 16:04:46

的最大优点是:能根据不同的被测腐蚀介质选取不同的膜片材料,以达到最好的耐腐蚀性。 The biggest advantage of the diaphragm pressure gauge is that different diaphragm materials can be selected according to different measured corrosion media to achieve the best corrosion resistance. Currently used diaphragm materials are tin bronze,

sus316 stainless steel, pure titanium, pure tantalum, Monel alloy, Hastelloy, polytetrafluoroethylene, etc. When using a diaphragm pressure gauge, in addition to correctly selecting its structural type, it is more important that

The material of the diaphragm diaphragm must be selected reasonably. The so-called reasonable is to consider both its corrosion resistance and economy. For example, the tantalum flakes and Hastelloy have excellent corrosion resistance, but such alloys are expensive.

Only used in environments where severe corrosion is not suitable for other inexpensive materials

系统由填充了密封液作为传递压力的介质,则由于密封液的温度体膨胀系数,使压力仪表随受压部温度升高而示值也升高, Since the diaphragm pressure gauge system is filled with a sealing liquid as a medium for transmitting pressure, the pressure meter's indication value also increases with the temperature of the pressure part due to the temperature body expansion coefficient of the sealing liquid.

Its temperature effect is related to the expansion coefficient of the sealing liquid, the stiffness of the diaphragm, and the temperature of the pressured part. Especially for low-range pressure instruments, the effect is more obvious. Generally, the temperature error of the pressure receiving part is not more than 0.1% / ℃.

Therefore, the total temperature effect of the diaphragm pressure instrument is generally the sum of the temperature effect of the universal instrument and the temperature of the pressure part of the diaphragm device.

的温度特性 .Temperature characteristics of diaphragm pressure gauge

1.Selection of sealing fluid


In order to ensure the reliability and safety of the diaphragm pressure gauge, a suitable sealing fluid should be selected according to different uses.

2.The liquid level difference of the diaphragm surface


As for the diaphragm pressure gauge with a soft connection pipe, the pressure receiving part is different from the installation position of the universal pressure gauge.

3. Since the diaphragm meter system is filled with a sealing liquid as a medium for transmitting pressure, the pressure meter's indication value also increases with the temperature of the pressure part due to the temperature body expansion coefficient of the sealing liquid.

The temperature error and the expansion coefficient of the sealing liquid, the stiffness of the diaphragm, and the temperature error of the pressure part are specified to be not more than 0.1% / ° C.

4, the corrosion resistance of the diaphragm table


The corrosion resistance of the diaphragm meter can be ensured by the reasonable selection of the corrosion resistant material material in contact with the measurement medium. The diaphragm material is selected by the user as needed.