Labels: Oxygen Analyzer T. SG700 Stack Gas Analyzer. Labels: SG700 Stack Gas Analyzer. IR400 Infrared Gas Analyzer. Labels: IR400 Infrared Gas Analyzer. IR200 Universal Infrared Gas Analyzer. The IR200 is capable of simultaneously measuring sample gas concentrations for O2 and up to three additional components from the following: CO. NO Five gases other than O. Are measured using the non-dispersion infrared (NDIR) method and a single beam system, while O. Is measured by the paramagnetic or zirconia method.