Aiming at problem of low precision and high power consumption of domestic traditional handheld oxygen analyzer

an oxygen analyzer that adopts embedded microcontroller STM32F103RBT6 as control chip is put forward. Standby power consumption can be reduced by controlling opening and breaking of components

system magnification can be manually switched according to measured concentration

time and alarm value and other related parameters are set through keyboard. The median average filtering algorithm is used to carry out software filtering in algorithm

combined with advantages and disadvantages of traditional two-point calibration method and multi-point calibration method

use multi-point calibration method to realize calibration of oxygen concentration

oxygen concentration value is calculated by using piecewise slope fitting algorithm. Experimental test proves high precision and high stability of this design.