The main error of the gas gauge consists of three parts: the error caused by the fluctuation of the gas source pressure, the error caused by the nonlinearity of the pneumatic measurement principle and the accidental error of the gas gauge body.
    1.Error caused by air source pressure fluctuation
    Air source pressure fluctuation refers only to the fluctuation of the working pressure of the air gauge. In actual work, the pressure of the air source network often changes, and the gas consumption of the meter will suddenly change, which will cause fluctuations in the working pressure of the instrument, which will cause measurement errors.
    2.Pneumatic measurement principle nonlinear error
    The nonlinear error of the instrument measurement equation belongs to the instrument system error. Because the nonlinear error is a random quantity that varies with the measured size when the instrument is actually measuring, the calculation is often processed according to the maximum value within the measurement range.
    3.Accidental error of gas gauge body
    The accidental error of a measuring instrument refers to the large variation of the indication value of the instrument caused by uncertain factors. Common instrument errors are caused by air cleanliness fluctuations and pipeline leakage.

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