What is the test of shock-resistant pressure gauge?

Correct selection of pressure (differential pressure) detection instrument

The correct selection of pressure gauge detection instruments mainly includes determining the type, measuring range, range, accuracy and sensitivity, overall size, and whether it needs remote transmission and has other functions, such as indication, recording, adjustment and alarm.

Main basis for selection:

1. Requirements for measurement in process production, including range and accuracy. In the case of static test (or slow change), it is stipulated that the maximum value of the measured pressure should be two-thirds of the full scale value of the pressure gauge; In the case of pulsating (fluctuating) pressure, the maximum value of the measured pressure is half of the full scale value of the pressure gauge.

The accuracy levels of commonly used pressure gauge detection instruments are 0.4, 1.0, 1.5 and 2.5, which should be selected from the perspective of production process accuracy and the most economical. The maximum permissible error of the pressure gauge instrument is the product of the range of the instrument and the percentage of the accuracy grade. If the error value exceeds the accuracy required by the process, the pressure instrument with higher accuracy should be replaced.

2. The properties of the measured medium, such as state (gas, liquid), temperature, viscosity, corrosiveness, degree of contamination, flammability and explosiveness, etc. Such as oxygen meter, acetylene meter, corrosion-resistant pressure gauge, high-temperature pressure gauge, diaphragm pressure gauge and so on, which are marked with "No Oil".

3. Site environmental conditions, such as ambient temperature, corrosion, vibration, humidity, etc. Such as a shock-proof pressure gauge for vibration environmental conditions.

4. Suitable for staff observation. According to the location and lighting conditions of the detection instrument, instruments with different diameters (overall dimensions) are selected.

Matters needing attention after the verification of pressure gauge is completed

1. Check whether all the screws of the pressure gauge have been tightened, and each screw is not allowed to be loose. It is particularly important to tighten the screws that specially fix the movement and the indicating adjustment screws. It should be noted that after the screw of the fixed movement is installed, the notch at the common top for torsion should not be horizontal to avoid the hairspring being embedded.

2. Unqualified pressure gauges and pressure instruments shall be degraded and used, and the mark of accuracy grade shall be changed.

3. Repair the paint stripping part, check whether the color of the lining ring meets the requirements of the medium used, wipe off the dirt on the dial and glass, and then install the shell.

4. After the pressure gauge shell is installed, check whether the pointer shaft and the pointer piece touch the glass, and then gently shake the watch body to see if there is any noise, so as to avoid parts or sundries from entering.

5. The device is sealed with lead, stamped with qualified seal, and then the stainless steel pressure gauge is removed from the connector of the calibrator and delivered for use.

6. After the daily work, the standard meter should not be left on the calibrator to prevent the zero position from changing due to collision and vibration. The spring tube of the standard meter should be cleaned regularly to remove the dirty liquid brought by the checked meter during calibration, so as to prevent corrosion and affect the accuracy for a long time.

Five Protective Measures for Stainless Steel Pressure Gauges in Winter

In the cold winter of stainless steel pressure gauge, the main means of "anti-freezing" for instruments and meters depends on the inspection of instrument workers. When encountering circuits such as freezing and condensation, the external steam belt is used to blow the pipeline, which is very primitive, inefficient and difficult for maintenance personnel. In order to reduce the workload of instrument maintenance, smooth production and make instruments and equipment safe in winter, the following five measures can be taken to prevent "frostbite" of instruments and equipment.

1. Pressure gauge installation measures

Choose the installation site reasonably, and install instruments when drying. There is no place where rain and snow drip.

2. Pressure gauge insulation measures

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

3. Pressure gauge inspection measures

Where conditions permit, a special person shall be responsible for the damage of thermal insulation materials every day. Technical confirmation and technical treatment shall be made to see if the steam pipeline is blocked.

4. Pressure gauge alarm measures

If conditions permit, an acousto-optic alarm device can be installed in case of steam leakage or power failure, so as to find and correct the hidden dangers of heat preservation and antifreeze measures in time.

5. Inspection measures for pressure gauges

The person in charge of regional instrument maintenance shall conduct regular inspection according to the scheduled inspection route. Check whether the valve of insulation pipeline is normal, whether the insulation box is normal, whether the drainage device is normal, whether the packaging of insulation materials is intact, and whether the heating power supply components are normal. Focus on the inspection of the instrument of the easy-to-freeze device, make inspection records, dry the instrument and its insulation and anti-freezing measures, clean and maintain it, and timely solve the problem of on-site insulation and heat tracing.

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