Precision digital pressure gauge accuracy grade description
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 that measures the pressure of a water pipe is 0~2MPa, and the accuracy level is 0.5%FS. What is the error of this digital pressure gauge? Calculate according to the full-scale error, then its error is +-(2MPa*0.5%)=+-0.01MPa. In other words, for a digital pressure gauge with an accuracy of 0.5% FS from 0 to 2 MPa, its full-scale error is +-0.01 MPa.
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? Take the above 0~2MPa and the accuracy level of 0.5%FS as an example. At 2MPa, its error is +-0.01MPa. 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. In the meantime, if the pressure value displayed by the instrument exceeds this range, the digital pressure gauge is out of tolerance and is unqualified. When the true value of the actual pressure 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 of the full scale calculation.
