... for CH4,Butane and H2 Stable performance with RoHS Marsh Gas Sensor 1. Summary MC203 operate on the catalytic ... detection in industrial field such as natural gas, LPG, coal gas, alkane ect combustible gas, and gasoline, Alcohol, ketone, ... benzene ect organic solvent;Combustible gas leaking alarm or detectors;Gas concentration meter 4. Specification. TypeMC203SeriesCatalyticWorking voltage( ...