QRAE 3 One-to-Four-Gas Detector (PGM-25XX Series) is a durable and versatile diffusion or pumped one-to-four gas monitor for detection of Combustibles (LEL), Oxygen, Hydrogen Sulphide, Carbon Monoxide, Sulphur Dioxide, Hydrogen Cyanide, Ammonia, Phosphine, Chlorine and Nitrogen Dioxide gases. Listed below are some common configurations of the QRAE 3 monitors. We can assist you in an Assemble to Order (ATO) Configuration for other variants, Please ask.