Five protective measures for pressure gauge in winter

In the cold winter, the main means of "anti-freezing" of instruments and meters still depends on the inspection of instrument workers. When encountering circuits such as freezing and condensation, the method of blowing outside steam belt and beating the pipeline is adopted, which is primitive, inefficient and hard for maintenance personnel. In order to reduce the workload of pressure gauge maintenance, stabilize production and ensure the safety of instruments and equipment for the winter, the following five measures can be taken to prevent "frostbite" of instruments and equipment.

1, pressure gauge installation measures

Choose the installation location reasonably, and the instruments should be installed in a dry place without rain and snow dripping.

2, heat preservation measures

Use thermal insulation materials to keep warm, that is, use thermal insulation materials to wrap the parts of instruments and meters that are easy to freeze or afraid of freezing. When winter comes, it is necessary to check and regularly discharge pollutants to prevent the insulation materials of packaging from being damaged.

3. Check measures

When conditions permit, a special person shall make technical confirmation and technical disposal for the damage of thermal insulation materials and the blockage of steam pipelines every day.

4. Alarm measures

Conditionally, a small acousto-optic alarm device in the state of steam leakage or power failure can be installed to facilitate the discovery and timely rectification of hidden dangers of heat preservation and anti-freezing measures.

5, inspection measures

The person in charge of regional pressure gauge maintenance shall conduct regular inspection according to the scheduled inspection route. During the inspection, it is necessary to check whether the valve of the insulation pipeline is normal, whether the insulation box is normal, whether the hydrophobic device is normal, whether the packaging of insulation materials is intact, and whether the power supply components of electric heat tracing are normal. Check the main points of the instrument of the easy-to-freeze device and make inspection records, carry out dry, complete and clean maintenance of the instrument and its insulation and anti-freezing measures, and solve the problem of heat insulation and heat tracing on site in time.

What are the differences between precision pressure gauge and precision digital pressure gauge in use?

Pointer-type precision pressure gauges are generally of direct reading type, and the precision pressure gauges with different precision grades have differences in reading resolution besides allowing basic errors. In order to ensure the reading accuracy of the precision pressure gauge, the dial of the precision pressure gauge is equipped with mirror rings to improve the reading accuracy, so as to correct the reading position and improve the reading accuracy of the precision pressure gauge. Digital pressure gauges have the characteristics of micro-power consumption, high accuracy, small size, easy operation, convenient on-site calibration and precise pressure measurement, and are widely used in laboratories and on-site measurement and scientific research in electric power, metallurgy, petroleum, chemical industry and metering system industries. The main differences between the two are:

1. Pointer-type precision pressure gauge: it is not resistant to vibration, which may easily lead to damage; Digital precision pressure gauge: vibration resistant.

2. Pointer precision pressure gauge: it must be kept vertical during verification; Digital precision pressure gauge: it doesn't matter whether it is vertical or not. 3. Pointer precision pressure gauge: There is a changing height difference (the defect of the spring itself) in the pointer meter for measuring liquid, and it can only be based on the center of the meter; Digital precision pressure gauge: no change in liquid column height difference.

3. Pointer-type precision pressure gauge: it can only look up, with parallax, and the reading can only be estimated, with large error; Digital precision pressure gauge: digital display, ignoring the difference.

4. Pointer precision pressure gauge: zero point variation is large; Digital precision pressure gauge: zero variation is small.

5, pointer precision pressure gauge: large temperature coefficient; Digital precision pressure gauge: with temperature compensation and small temperature coefficient.

6, pointer precision pressure gauge: linear, large hysteresis; Digital precision pressure gauge: linearity, small hysteresis.

7. Pointer precision pressure gauge: internal cleaning is difficult; Digital precision pressure gauge: easy internal cleaning.

8. Pointer precision pressure gauge: it cannot be overloaded, otherwise it will cause permanent damage; Digital precision pressure gauge: large overload range.

9. Pointer precision pressure gauge: not resistant to fatigue. The selection of pointer precision pressure gauge must be one specification larger than the meter to be tested, and the same standard pressure gauge cannot be used to verify the meter to be tested with the same limit for a long time; Digital precision pressure gauge: no influence.

10. Pointer precision pressure gauge: extremely poor reliability, requiring frequent maintenance, and difficult maintenance, requiring professional standards; Digital precision pressure gauge: high reliability, almost maintenance-free.

11. Pointer precision pressure gauge: poor sensitivity, so it is necessary to knock the case when reading; Digital precision pressure gauge: high sensitivity.

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