Precautions for Pressure Gauge Verification

After a period of use of the pressure gauge, the internal parts are worn and deformed, resulting in various failures or changes in the value of the instrument, resulting in loss of accuracy and out-of-tolerance phenomenon. In order to ensure the accuracy of the pressure gauge value, in order to achieve the indication For the purpose of being correct, safe and reliable, periodic verification of the pressure gauge should be carried out. Pay attention to the following matters when calibrating the pressure gauge.

1. Requirements for ambient temperature during verification:

1) The ambient temperature requirements during the verification of the precision pressure gauge are:

0.25 grade is (20±2)℃;

0.4 grade is (20±3)℃;

2) The ambient temperature requirements for general pressure gauge verification are: (20 ± 5) °C;

Requirements for working medium during verification

For the pressure gauge with the upper limit of measurement not greater than 0.25Mpa, the working medium must be air or other non-toxic, harmless and chemically stable gas.

For the pressure gauge with the upper limit of measurement greater than 0.25Mpa, the working medium can be liquid, such as transformer oil, medicinal castor oil, glycerin mixture, etc.

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