GC-4285 Coal Mine Gas Chromatography Analyzer is the core equipment of EWAI, as the third-generation,integrated with coal mine gas pipes system to monitor and forcast the risk of coal mine gas explosion. The systems (including other models: GC-4085,GC-4008,GC-4208) has been used for more than 20 years in the most of coal mines in China, there has not been ONE fatal incidence due to the failure of the forcast of the gas explosion. The system is proven and extremely reliable. The systems have save many lifes since.