during the work of the gas pumping station, the pumping station will extract the gas from the coal seam and transport it to the mine. Gas leakage or gas concentration exceeding the standard around the pumping station will pose a threat to the safety of the pumping station. Portable gas monitoring alarm is a kind of equipment that can monitor the gas concentration in real time. When the gas concentration exceeds the specified limit, the alarm will automatically give an alarm prompt, and at the same time, the pump will be shut down to avoid gas accidents.