The fixed gas detector is used to monitor the gas concentration in your warehouse and workplace. When the concentration exceeds the preset alarm value, it will send out an audible and visual alarm signal to remind users to take safety measures in time. This explosion-proof gas detector has a variety of gases to choose from, such as O2, H2, H2S, CO, CH4, SO2, NO2, NH3, PH3, O3, SF6, etc.