Calibration and testing process of pressure gauge

Calibration and testing process of pressure gauge

For pressure gauge calibration, start from the zero point, pressurize evenly and slowly to the calibration point (i.e. the standard indicated value), then read the indicated value of the calibrated pressure gauge (according to the indicated value of 1 / 5), and then tap the pressure gauge housing with your finger to read. Indication value and record of calibrated pressure gauge, indication value and standard calibration of pressure gauge before and after tap. The difference between the indicated values is the indication error of the calibration point: therefore, calibrate the selected calibration point in turn until the upper limit of the detection, cut off the pressure source (or vacuum source), withstand the pressure for 3 minutes, and then depressurize the calibration point to zero through the following steps. The pressure gauge with positive and negative pressure ranges should be positive and negative (sheet) pressure gauges. Calibration of pressure range indication error

2、 Return error calibration
Calibrate the return error when calibrating the indication error. The difference between the indicated value of the pressure gauge and the indicated value of the pressure gauge is the return error of the pressure gauge after knocking the case at the same calibration point.
3、 Tap displacement calibration
Perform tap displacement calibration when calibrating the indication error. The change of the indicated value caused by the change of pointer displacement before and after knocking the pressure gauge housing at the same calibration point is the knocking displacement of the pressure gauge.
4、 Pointer deflection stability inspection
In indication error calibration, visual acuity observes the deflection of the pointer.