The SERIES U single and multichannel wall mounted gas monitors use unique, patented sensors that are highly specific, fast responding, poison resistant, and are unaffected by moisture or temperature changes. Sensors are available for Hydrocarbons, Freons, Ethylene Oxide, Alcohols, Diesel/Gasoline Vapors, Hydrogen, Ammonia, Sulfur Dioxide, Hydrogen Sulfide, Carbon Monoxide, Combustibles and many others gases.