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Diaphragm Pressure Gauge - Shanghai Automation Instrument Fourth Factory
Diaphragm Pressure Gauge - Shanghai Automation Instrument Fourth Factory
Product details
Diaphragm Pressure Gauge - Shanghai Automation Instrument Fourth Factory
In order to make the universal pressure gauge suitable for measuring the pressure of media with strong corrosion, high temperature, high viscosity, easy crystallization, easy solidification, and solid particles, as well as situations where it is necessary to avoid direct entry of the measuring medium into the universal pressure instrument and prevent sediment accumulation and easy cleaning, a diaphragm gauge consisting of a diaphragm isolator and a universal pressure instrument system must be used.
Diaphragm gauges are mainly used to measure the pressure of fluid media in the production processes of industrial sectors such as petrochemicals, alkali production, chemical fibers, dyeing, pharmaceuticals, food, and refrigeration.Structural principle
When the pressure P of the measuring medium acts on the diaphragm, the diaphragm deforms and compresses the sealing fluid of the pressure measuring system of the pressure instrument, forming a pressure state of P - △ P. When the rigidity of the diaphragm is small enough, Δ P is also very small, and the pressure formed by the pressure measuring system of the pressure instrument is close to the pressure of the measured medium.
Specification
1. Temperature characteristics of diaphragm meter
Due to the fact that the diaphragm gauge system 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, which have a more significant impact. 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.
2. Diaphragm gauge liquid level difference
Especially for diaphragm pressure gauges with flexible connecting pipes, due to the different installation positions of the pressure receiving part and the universal pressure gauge, there will be an impact of liquid level difference △ P as shown in the figure.
3. Corrosion resistance of diaphragm meter
The corrosion resistance of diaphragm meters can be ensured by selecting appropriate materials for the diaphragm, flange, and sealing ring in contact with the measuring medium.
Diaphragm material: 0Cr17il12M02 (316); Monel alloy (Cu30Ni70); Tantalum (Ta) and fluoroplastic (F4).
Flange material: Stainless steel 0Cr17il12M02 (316); Stainless steel lined with fluoroplastic (316+F4).
Sealing gasket material: Nitrile rubber; Fluororubber; Silicone rubber and fluoroplastics.
Diaphragm Pressure Gauge - Shanghai Automation Instrument Fourth Factory
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