The GLH100 hydrogen sulfide sensor for mines is used to monitor the concentration of hydrogen sulfide in general industrial environments. With a single-chip microcomputer, the sensor circuit supports the output of standard signals. It is capable of continuously and automatically converting the hydrogen sulfide concentration into standard electrical signals and transmitting them to the associated equipment. It has the functions of local display of hydrogen sulfide concentration, over-limit sound and light alarm, etc. The power supply circuit of the sensor is a switching power supply, to reduce the overall power consumption, which is beneficial to increase the transmission distance.