... for home, coal station, colliery, car and so on.* Detect all sorts of combustible gases, such as coal gas, liquid petroleum gas and natural gas ... : ImmediatelyCoal gas: 1000~5000ppm,Liquid petroleum gas: 1000~5000ppm,Natural gas: 1000ppm~5000ppm*.Responding time: Gas ≤30S*. ... gas leaking, and notice the relative departments and professional persons in time. 2012 New Hot Sale China Produced Gas ...