The GW100 mine temperature sensor is used to monitor the gas temperature of coal mines, which is suitable for local digital display of the measured temperature and output of signals. With a single-chip microcomputer, the sensor circuit is capable of locally displaying the temperature and sending various signals for remote collection. The zero point and sensitivity can be adjusted remotely. In addition, the system has the functions of fault self-check to facilitate the use and maintenance. 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 between the substation and sensor.