FM has these stages Class I, Division 1, Groups B, C, and D.The analysis of oxygen has become a part of every industry that uses or produces gas or gas mixtures.In which the Teledynes complete line of portable gas analyzers, provides this vital analysis in a compact package operating without an external power source.Oxygen concentration in the sample gas stream is measured by Teledynes own advanced Micro-fuel Cell sensor specific to oxygen. High-accuracy and fast response of these units is ideal for measuring oxygen in hydrogen, nitrogen, argon, helium, acetylene, ethylene, butadiene, carbon dioxide, hydrocarbons and many other gases.