This paper discusses the additional error of pressure-difference transducer when filling water. A new method is suggested to decrease such error.

本文对差压变送器“注水”使用时，因注水而产生的附加误差作了分析，提出了减少此附加误差的方法。

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Capacitive pressure difference sensor is fixed in the center of the tube and connected with the pulse width modulation circuit so that capacitive flow transducer is made up.

把电容式差压传感器固定在管道中央，并配接脉冲调宽电路，即构成电容式流速变送器。

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