Aiming at the problems such as large drift

high costs and short maintenance intervals of the extensively used gas detectors at the current stage

the timing automatic zero-point correction approach based on the thermostatic control circuit is presented.This approach uses the catalytic combustion gas sensor as targets

adopts the thermostatic control circuit to provide power for sensors

takes the theoretical analysis of zero drift and large quantities of experimental research as the basis and solves the problem of zero stability of this type of detectors which had not been solved for a long time.It employs the analog electronic switch to match resistance network to realize digital potentiometer design and saves costs.The experimental results demonstrate that the residual deviation of the thermostatic control circuit after zero correction reduces one order of magnitude than the output value without correction and provide technical support for the design of gas detectors which have the function of automatic timing zero setting.