Describes the structure and troubleshooting of electrical conductance sensor for Fresenius 4008B hemodialysis machine,the searching of overheat protector without labeled on the drawing; as well as the diagnosis of solenoid valves in the conditions of normal and high temperature.

Wigner-Ville analysis of measurement fluctuating signals of conductance sensor in gas/liquid two-phase flow;

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.

An embedded real-time microprocessor MC56F8323 is used for sampling two fluid flowing signals of conductance sensor's output, calculating cross-correlation function of these signals, and finally transferring the flowrate up to the host computer on the ground through RS485.

A conductivity sensors and a A/D converter are used for signal collect and change respectively,the central processing unit calculate the results then display on the 1602LCD.