Aimed at defects of the existing integrity measuring instrument

a fully automatic membrane material integrity measuring instrument is designed.In order to achieve precise control of pressure and flux

the instrument drives the switching solenoid valve and the regulating solenoid valve action by detecting the feedback signal of pressure and flux sensors

using STM32 embedded system chip as the main controller and adopting closed-loop PI control method.Expound the theory of integrity test and software and hardware implementation of controlling system in detail.Experimental results show that the bubble point pressure measured by the designed instrument is between the results of scanning electron microscope and pore size distribution analyzer.And the diffusion flow can be measured by the flow sensor.