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Common problems in the metrological verification of stainless steel pressure gauges are as follows:

1. The working attitude of the metrological verification personnel is lax

In order to promote the sustainable development of my country's industry, it is necessary to do a good job in the metrological verification of stainless steel pressure gauges. In order to improve the measurement verification level of stainless steel pressure gauges, it is necessary to ensure the correct working attitude of the measurement verification personnel. However, in actual work, some measurement and verification personnel have an improper working attitude, and even do not take their work seriously from beginning to end, and fail to discover the inherent problems of stainless steel pressure gauges in time, such as aging, loosening, and inaccurate readings of stainless steel pressure gauges, which can easily lead to safe production. Hidden. Some verifiers focus on the speed of verification and ignore the quality of verification, resulting in inaccurate verification results, which is not conducive to the normal production activities of enterprises.

2. The use of stainless steel pressure gauge is not in place

In order to ensure the accuracy and reliability of the measurement verification structure of the stainless steel pressure gauge, the verification personnel need to have rich professional knowledge and master the correct use of the stainless steel pressure gauge. If the stainless steel pressure gauge is used incorrectly, it will lead to inaccurate measurement results. If the error is large, it will directly affect the production activities and economic benefits of the enterprise, resulting in quite serious consequences.

3. Errors in the checklist

(1) The indicated speed of the inspected meter is different, also called curve error;

(2) The error always increases or decreases by a fixed value, the main reason is that the pointer is not installed in place, and the pointer reading will change when the pressure increases or decreases;

(3) The error of the instrument under test increases or decreases according to a certain proportion. The reason for the error is the change of the rotation ratio of the stainless steel pressure gauge;

(4) There are many reasons for this error, such as loose hairspring fixing, over-tightening, loose pointer, etc.

The precautions for corrosion protection of stainless steel pressure gauges are as follows:

1. For general corrosive media, the stainless steel spring tube is resistant to corrosion for 1 to 2 years, and can be used as an ammonia stainless steel pressure gauge. When installing, the pressure guiding pipe should be short, and the buffer coil should be changed to a buffer tank to prevent impurities from being blocked.

2. If the medium corrodes stainless steel and copper, the buffer tank can be replaced with an isolation tank, and corrosion-resistant isolation fluid can be added. The type of spacer fluid can be selected according to the properties of the measured medium, but it will not deteriorate after use for more than half a year. If ordinary spacer fluid is not applicable, fluorochlorofluorocarbon oil can be used as spacer fluid. Therefore, the isolation tank should be miniaturized, and the fluorine oil should be recovered and reused during disassembly and assembly.

3. Diaphragm stainless steel pressure gauge can be used. Currently, there are molybdenum 2 titanium and tantalum sheets. Methyl silicone oil is used to transmit pressure between the diaphragm and the spring tube. If the diaphragm material is not corrosion resistant, a perfluoroethylene propylene diaphragm can be added, but the sensitivity of the instrument will be reduced. It can also be used directly as an isolating diaphragm, but pay attention to the permeability of the medium. Fluorinated oil can be selected for the delivery fluid, which can play a double isolation role.