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Pressure gauge pressure gauge accuracy is accuracy grade level or level of accuracy referred to, (GB/T1226-2001 "general gauge" instrument of national standards known as the precision level, JJG52-1999 "spring tube general gauge, Pressure vacuum gauge and vacuum gauge, "called meter accuracy level. manometer accuracy classes: 1.0; 1.6; 2.5; 4.0, the level of the nominal diameter of the instrument case should meet the following requirements.
| Nominal shell diameter (mm) |
Accuracy class |
| 40,50,60 40,50,60 |
2.5, 2.5, |
| 100 100 |
1.6,2.5 1.6,2.5 |
| 100,150,160,200 100,150,160,200 |
0.4, 1.0,1.6 0.4, 1.0,1.6 |
Gauge level of accuracy and tolerances and their relationships following table two
| Accuracy class |
Tolerance% (calculated according to the percentage range) |
| Zero |
(90~100)% Measurement limo 100)% |
Rest |
| With only pin |
Non-stop sales |
| 1.0 |
1 |
Plus or minus 1 |
Plus or minus 1.6 |
Plus or minus 1 |
| 1.6 (1.5) |
1.6 |
Plus or minus 1.6 |
Plus or minus 2.5 |
Plus or minus 1.6 |
| 2.5 |
2.5 |
Plus or minus 2.5 |
Plus or minus 4 |
Plus or minus 2.5 |
| 4.0 |
|
Plus or minus 4 |
Plus or minus 4 |
Plus or minus 4 |
| Note: Use the 1.5 gauge tolerance by 1.6 calculations, the level of accuracy may change |
In the reference operating conditions, pressure gauge accuracy level testing should include the following four items:
1 show error in the measurement range, showing the error should be less than allowed under Table II error.
2 return the error in the measuring range, return error shall not exceed the allowable provided in Table 2 the absolute value of the error.
3. Tap tap displacement case, the pointer shows changes in the value should be less than the amount specified in Table 2 allowed absolute error of 1 / 2.
4 pointer deflection stationary in the measuring range, the pointer deflection should be smooth, non-beating and stuck phenomenon
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