(under subclass 136) Subject matter in which the fluid tested for the presence of molecular oxygen is either a fuel/air mixture or the exhaust gas from some process.
SEE OR SEARCH THIS CLASS, SUBCLASS:
116, for analysis of gas streams for their nitrogen oxides content.
134, for analysis of gas streams for their carbon monoxide content.
143, for analysis of gas streams for the residual hydrocarbon content, flammability or hydrogen or hydrocarbon content in an air/fuel mixture.
