CZY50 type gas detection tubes cylindrical positive-pressure sampler for underground coal mining, metallurgy, chemicals, coke, gas station, tunnel engineering, environmental protection and health and epidemic prevention departments for the rapid determination of carbon dioxide in the environment of the scene in the air, chlorine dioxide the concentration of nitrogen, ammonia, hydrogen and other gases. Is to ensure production safety, the prevention of disasters and reliable testing instruments. Designed to measure carbon monoxide, used to refer to a carbon monoxide detector