China’s industrial sensors have seven accuracy levels, 0.1, 0.2, 0.5, 1.0, 1.5, 2.5 and 5.0. It shall be marked on the scale or nameplate of the instrument. The accuracy of the instrument is conventionally called precision, and the accuracy grade is conventionally called precision grade.

Basic error of measuring sensor: basic error, also known as reference error or relative error, is a simplified relative error.

7 performance indexes: linearity, sensitivity, hysteresis, repeatability, drift, resolution and threshold.

In industrial measurement, in order to express the quality of the instrument, the accuracy grade is usually used to express the accuracy of the instrument. The accuracy level is the maximum reference error, excluding the positive, negative and percentage signs.

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