1. Selection of precision pressure gauge grades:
According to national regulations, the grade accuracy of standard pressure gauges cannot exceed one-third of the grade accuracy of the tested pressure gauge.
If the level of the pressure gauge that needs to be calibrated now is 1.6, then the level accuracy of the standard pressure gauge should be less than that of the precision pressure gauge of 0.5. However, the country has clear regulations on the level accuracy of precision pressure gauges, so a 0.4 level precision pressure gauge can be selected.
2. Selection of precision pressure gauge range:
A precision pressure gauge is a relatively precise instrument, and when using it, try not to exceed two-thirds of the range of the precision pressure gauge.
If the pressure gauge that needs to be calibrated now has a grade of 1.6 and a range of 0-10 kilograms, and the pressure unit is converted to MPa, it is 1MPa. Therefore, the range of the selected precision pressure gauge is 1 divided by two-thirds, which is equal to 1.5MPa. However, there is no 1.5Mpa precision pressure gauge in the standard range range range of precision pressure gauges specified by the state, so a precision pressure gauge with a similar range range range is selected, which is 0-1.6MPa