For the water volume fraction measurement of oil-in-water flow, the mathematical model for the forward problem of sensitivity field in the ring-shape four-electrode conductance sensor was analyzed.

A sensor in the utility model adopts a no-leakage PH composite electrode and an annular conductance electrode in which a temperature sensor is arranged.

With optimized multi-electrode array conductance sensor, a two-phase flow measurement system based on DSP technique was designed.