Menu interface: high-definition simulation icons are used to display the function names of each menu. High-definition 2.5-inch high-definition color screen (LCM): display real-time concentration, time, temperature, humidity, storage status and other information. Lightning protection and anti-static: resistant to high-intensity pulse surge current impact. Three display modes can be switched: simultaneous display of multiple gas concentrations, circular display of single-channel gas concentrations in large fonts, and real-time curves. Application occasions: Petroleum, environmental protection, gas distribution, storage, flue gas analysis, air treatment and other occasions that require fixed installation and online detection of gas concentration.