Combustible gas detectors are used in workplaces where combustible gases are used to ensure worker safety, detect the location of any leaks and measure gas concentrations. The shell is specially designed to prevent explosion. The monitor is ideal for environments such as power plants, refineries, natural gas sites, the oil and gas industry, and anywhere flammable, toxic gases are present. The monitor is installed in the NEMA 4 explosion-proof housing for Classes 1, B, C and D, 2, E, F and G. PureAire's durable, long-life LEL catalytic sensors will last 4-5 years in normal environments for several years without replacement.