A new titration end point indicator module based on constant current source stimulating double platinum electrodes is designed. The module circuit is designed based on the STM32 microcontroller. And the titration volume-voltage curve of the titration process is obtained by collecting voltage signals on double platinum electrodes. The experimental results show that compared to the traditional indicator module

this module has superior anti-interference

higher measurement precision and lower maintenance cost

which provides a new choice for on-line analysis on titration end point signal acquisition of permanganate index.