Abstract
A Multi-electrode Capacitance Sensor for measuring containing water ratio in crude oil and its circuit has been designed. The multi-electrode capacitance sensor is assembled with the structure of combining, which is easy to clean and maintain. By setting up the mathematic model of the measuring method, the function of the changing rate of containing water ratio in crude oil and the equivalent capacitance of multi-electrode capacitance sensor is achieved. A experiment to contrast the measuring containing water ratio in crude oil with pent-electrode capacitance sensor and mono-electrode capacitance sensor has been carried out, proved that comparing with the result of experiment ,the precisions of fifth-electrode capacitance sensor in measuring the containing water ratio in crude oil has been greatly improved. Furthermore whether the containing water ratio in crude oil is high or low, the measuring result by using fifth-electrode capacitance sensor is stable.
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