The MIC-500S fixed toxic, harmful, and flammable gas alarm is used for on-site gas concentration detection and gas concentration exceedance alarm. It can accurately detect the concentration of various toxic, harmful, and flammable gases. And display real-time concentration values and standard signal outputs on site. Select imported brands (Honeywell, Nippon Gen, CITY, Alpha, Dynament, Membrapor, etc.) of gas sensors, with main detection principles including electrochemistry, infrared, catalytic combustion, thermal conductivity, and PID photoionization. It has the advantages of stable signal, high sensitivity and accuracy. The explosion-proof wiring method is suitable for various hazardous locations.