... detector & so2 gas detector & nature gas leak detector: 1.High and low concentration alarm, 2. Ex d II CT5 TGas-1031 h2s detector & so2 gas detector & nature gas leak detector ... , poisonous and harmful gas might leak, such as gasholder station and special industrial factory building, etc. ... Detectable gasCombustible vapour of liquids, including methane, LPG, coal gas and gasoline, etc., as well as ...