Oxygen AnalyzerThe Rapidox 2100 and 3100 oxygen analyzers allow for fast and accurate analysis of oxygen gas from under 1 ppm all the way up to 100% volume. Each unit comes complete with software for data logging. The Rapidox 2100 is a transportable version with remote sensor head. The sensor head is a zirconia ceramic tube heated to 1202°F (650°C). The Rapidox 3100 is a fixed version with built-in air pump and internal sensor.