Below I will introduce the accuracy of precision digital pressure gauges to you.
First of all, the accuracy of a digital pressure gauge refers to the full-scale error. For example, the range of a digital pressure gauge for measuring the pressure of a water pipe is 0~2MPa, and the accuracy level is 0.5%FS. So what should be the error of this digital pressure gauge? Calculated according to the full-scale error, then its error is +-(2MPa*0.5%)=+-0.01MPa. That is to say, a digital pressure gauge with an accuracy level of 0.5%FS and 0~2MPa has a full-scale error of +-0.01MPa.
Secondly, after knowing how to calculate the full-scale error of a digital pressure gauge, how to determine the error of a pressure value, or how much pressure should a qualified digital pressure gauge display? Or take the above 0~2MPa, the accuracy level is 0.5%FS as an example, when the error is +-0.01MPa at 2MPa, when the pressure of the digital pressure gauge is really 2MPa, then the pressure value displayed by the instrument is between 1.99~2.01MPa If the pressure value displayed by the instrument exceeds this range, the digital pressure gauge is out of tolerance and fails. When the actual pressure value of the digital pressure gauge is 1MPa, its error is still +-0.01MPa. At this time, the pressure value displayed by the instrument is between 0.99 and 1.01. If it exceeds this range, the instrument is out of tolerance. That is to say, the error of any point between 0~2MPa is +-0.01MPa, which is calculated according to the error calculated by the full scale.
