Diaphragm pressure gauge

Diaphragm pressure gauge
Structural Principle of Diaphragm Pressure Gauge
Diaphragm pressure gauge consists of various general-purpose pressure instruments and diaphragm isolators of different structures to form a closed system filled with sealing liquid. When the pressure of the measured medium acts on the diaphragm, the diaphragm deforms and compresses the sealing fluid in the closed system. Due to the inherent properties of the sealing fluid, the elastic element in the pressure instrument produces corresponding elastic deformation and displacement, and the pressure value is displayed through the indicating device. When the stiffness of the diaphragm is small enough, the pressure indicated by the pressure instrument is close to the pressure value of the measured medium.
Diaphragm pressure gauge
Main technical indicators
Temperature characteristics of the diaphragm gauge
Since the system of the diaphragm gauge is filled with sealing liquid as the medium for pressure transmission, the temperature influence of the diaphragm gauge is the same as The expansion coefficient of the sealing liquid is related to the stiffness of the diaphragm and the temperature of the pressurized part. When the operating temperature of the instrument deviates from ℃, the impact on low-range pressure instruments is particularly obvious. Generally, the temperature error of the pressure-receiving part is not greater than ./°C. Therefore, the temperature influence of the diaphragm meter is generally the sum of the temperature influence of the general pressure instrument and the temperature influence of the pressure-receiving part of the diaphragm isolator.
Liquid level difference of diaphragm gauge
Especially for diaphragm gauges with flexible connecting pipes, since the pressure-receiving part of the diaphragm and the installation position of the universal pressure gauge are not on the same level, there will be an impact of liquid level difference on accurate measurements. More attention should be paid.
Corrosion resistance of diaphragm meter
The corrosion resistance of diaphragm meter can be ensured by appropriately selecting the materials of the diaphragm flange and sealing gasket of the parts in contact with the measuring medium.
Diaphragm material: Monel alloy, Hastelloy, tantalum and fluoroplastic.
Flange material: stainless steel rr stainless steel lined with fluoroplastic (+).
Sealing gasket material: rubber, fluorine rubber, silicone rubber and fluoroplastic.
Selection of diaphragm fluid
To ensure the reliability and safety of the diaphragm meter, appropriate sealing fluid should be selected according to different uses.
Sealing liquid selection reference table
Working liquid name
Temperature range of diaphragm device (℃)
Normal working environment temperature of the instrument (℃)
Glycerin aqueous solution
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Silicone oil (low viscosity)
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Silicone oil (high viscosity)
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Remarks
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Technical parameters of diaphragm pressure gauge
Product name
Product model
Accuracy level
Measuring range
Connection method
Diaphragm pressure gauge
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Open flange


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I-shaped flange


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Angle flange


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Hose connection

Sanitary diaphragm pressure gauge
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Clamp connection

Note: If you have special requirements for the instrument diaphragm body material, diaphragm material and flange size, please consult with the company Made to order.