Accuracy level of pressure gauge

1. The accuracy level of the pressure gauge reflects the comparison between the inspected gauge and the precision gauge.
The accuracy of how close the indicated value is to the true value. It is equal to the percentage of the ratio of the absolute value of the maximum basic error to the upper limit of the measurement, and is determined according to the size of the error generated in the calibration.
2. China's general industrial pressure gauges are divided into 4 accuracy grades, which conform to the allowable error of the pressure gauges in the verification regulations of JJG52-1999 "Bronze Tube General Pressure Gauges, Pressure Vacuum Gauges and Vacuum Gauges". The four accuracy levels are: level 1, level 1.6, level 2.5, and level 4. The allowable errors (calculated as a percentage of the upper limit of measurement) are ±1%, ±1.6%, ±2.5%, and ±4%.
3. In 2005, China's new digital pressure gauge verification regulations were announced and implemented, which complies with JJG875-2005 "Digital Pressure Gauge Verification Regulations". The pressure accuracy is specified as ±0.01%, ±0.02%, ±0.05%, ±0.1%, ±0.2%, ±0.5%, ±1.0%, ±1.6%.
4. The method to reasonably select the accuracy level of the pressure gauge should be based on the requirements of the production process, economy and practicality, testing methods, etc., according to the allowable error required by the minimum pressure to be measured.