Analysesystem zur Feststellung der Stickstoffkonzentration mit hoher Genauigkeit

摘要

An analyzer compensates for gas flow perturbations by providing a makeup flow of carrier gas (60) to maintain the pressure and/or flow rate of analyte and inert gas through a detector (26) constant such that a accurate determination of a low concentration of an analyte in the presence of a high concentration of a second analyte can be accurately determined. In one embodiment, a carrier gas is introduced through a valve (64) responsive to the detected pressure (66) in the gas flow stream (65) between a scrubber (22) and a subsequent detector (26) for maintaining the pressure constant during an analysis. In another embodiment of the invention, a flow transducer (76) is positioned in the gas flow path between the scrubber (22) and detector (26) and coupled to a flow control valve coupled to introduce carrier gas as a function of detected gas flow such that the flow rate of gas into the detector is maintained constant.