带有电极挂料的电容式物位传感器的数学模型分析

传统电容式物位传感器存在着严重的缺陷，即存在电极挂料电容对测量的影响，中分析了物位传感器电极挂料的等效电路，提出了它的数学模型，计算了它的等效复数阻抗，得到电极挂料复阻抗的实部与虚部相等的结论，利用这一结论可以扣除电极挂料电容，从而消除它的影响，提高测量准确度。

The Mathematic Model of Capacitance Level Sensor with Probe Attachment

Using a traditional capacitance level sensor,the additional capacitance of probe attachment will cause serious error. An equivalent circuit of the level sensor is discussed, the mathematical model of probe attachment is offered and its complex impedance is calculated. The result shows that the imaginary component of this complex impedance is equal to the real component. This conclusion can be used to remove the effect of additional capacitance of the probe attachment,so,to increase the measurement accuracy.