Patent ID: 6827903
Filing Date: 2004-12-07
Classification: G01N,Y10T

Abstract:
A single pass analyzer for detecting the concentration of hydrogen, nitrogen, and oxygen in a sample comprising:a furnace for fusing a sample; a supply of carrier gas coupled to said furnace to provide an analyte stream of byproducts of fusion; conduits coupled to said furnace and to said supply for defining a conduit flow path for carrying byproducts of fusion in series through a plurality of detector and analyzer elements; a first infrared detector coupled in said conduit flow path for detecting oxygen in the form of CO in said sample; a second infrared detector coupled in said conduit flow path for detecting oxygen in the form of CO2 in said sample; a catalyst coupled in said conduit flow path for converting hydrogen in hydrogen compounds to H2O and CO to CO2; a third infrared detector having an input coupled to said catalyst for detecting hydrogen as H2O in the analyte stream from the catalyst; a fourth infrared detector comprising a high sensitivity CO2 infrared detector coupled in said conduit flow path for detecting low levels of oxygen in the sample in the form of CO2; a scrubber coupled to said fourth detector, said scrubber operative to remove H2O from the analyte stream; and a thermal conductivity cell coupled to said scrubber for detecting nitrogen in a sample.