... low concentration alarm 2.It detect combustible, poisonous and harmful gas leak TGas-1031 Ammonia Gas Alarm & Monoxide Alarm TGas ... output. It is extensively applied in petroleum, petrochemistry, chemical industry, gas, coal, metallurgy and electric power; safety detection in ... gasCombustible vapour of liquids, including methane, LPG, coal gas and gasoline, etc., as well as poisonous and harmful ...