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What problems should be paid attention to when using precision pressure gauge

Author: admin Source: Release time: 2016-11-30 13:47:46 Number of hits:

The standard spring gauge should be used in the calibration of multi tube pressure gauge. The relative accuracy of this kind of meter is higher than that of direct reading type because the value of this kind of meter is verified by the method of fixed degree. We should also pay attention to the following points in use.

1. The standard meter can only be used when the verification seal is normal and the verification certificate has not expired.

2. When using the precision pressure gauge, it should be used according to the value given in the verification certificate. For example, for a 0-1.0mpa precision pressure gauge, when the actual pressure value on the verification certificate is 0.1MPa, the indicated value is 29.8 grid. When the precision pressure gauge indicates 29.8 grid, it is the standard value of 0.1MPa. The pressure value not given in the certificate shall be calculated according to its linear data for comparison.

3. When tapping the displacement verification, only the tested meter should be knocked, not the precision pressure gauge. It should be regarded as a relative true value, and its error should not be considered.

4. When the precision pressure gauge is used to verify the working Bourdon tube pressure gauge, the absolute value of the basic error of the precision pressure gauge must be less than 1 / 3 of the absolute value of the basic error of the pressure gauge to be inspected. The measuring upper limit of the precision pressure gauge should exceed 75% of the upper limit of the tested pressure gauge.

5. There are many kinds of scale division number of precision pressure gauge, which is determined by the measuring range of pressure gauge, so there are as many as 120, 125, 160, 200, 250, 300, 320 and 400. It is difficult to convert the corresponding relationship between pressure and division. It is better to make the corresponding data of pressure and division into a comparison table, which is pasted on the pressure gauge or beside the working table, so as to facilitate the data comparison. When conditions permit, it is easy to find the software of pressure gauge and grid calculation on the Internet

6. The precision pressure gauge is mostly used for the calibration of low pressure gauge. Because the pressure gauge is low, most of the pressure signal sources are connected with rubber hose. If the hose is aged or the hose is not tightly connected, when the pressure signal suddenly increases, the hose may be detached and the precision pressure gauge suddenly has no pressure, which will cause an impact on the service life and stability of the precision pressure gauge In order to avoid the above problems, it can be protected by adding gas at the joint of the instrument.

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Address: Lugang building, international harbor district, Xi'an City Precision pressure gauge