2020-11-06
Pressure gauges are available in many different accuracy classes. Accuracy classes are specified in ASME B40.100 (accuracy classes from 0.1 to 5 % range) as well as in EN 837 (accuracy classes from 0.1 to 4 % range) standards. The accuracy class specification most often being “% of range” means that if the accuracy class is 1% and if the scale range is zero to 100 psi, the accuracy is ± 1 psi.
Make sure you know the accuracy class of the gauge you are going to calibrate, as this will naturally specify the acceptable accuracy level, but it will also have other effects on the calibration procedure.