Feature
Due to the system of diaphragm gauges being filled with a sealing fluid as the medium for pressure transmission, the temperature influence of diaphragm gauges is related to the expansion coefficient of the sealing fluid, the stiffness of the diaphragm, and the temperature of the compressed area. This effect is particularly pronounced on low-range pressure gauges. Generally, the temperature error of the compressed area is specified not to exceed 1.0%/°C, so the temperature influence of diaphragm gauges is usually the sum of the temperature influence of general pressure gauges and the temperature influence of the compressed area of the diaphragm isolator.
Diaphragm gauge's level difference
Especially for diaphragm gauges with soft connection tubes, due to the pressure section of the diaphragm not being at the same level as the installation position of the general-purpose pressure gauge, there will be an influence amount of ΔP due to the liquid level difference. This should be paid closer attention to during measurement.
Diaphragm meter's corrosion resistance
The corrosion resistance of diaphragm gauges can be ensured through the appropriate selection of materials for the diaphragm, flange, and sealing gasket in contact with the measuring medium.
Diaphragm Materials: 0Cr17Ni12Mo2 (316); Monel Alloy (Cu30Ni70); Hastelloy (H276C); Tantalum (Ta) and Fluoroplastic (F4).
Franklin Materials: Stainless Steel 0Cr17Ni12Mo2 (316); Stainless Steel Lined with Fluoroplastic (316+F4).
Sealing Ring Materials: Rubber; Fluororubber; Silicone Rubber; and Fluoroplastic.