High speed vapor detection with low temperature bypass

Details High speed vapor detection with low temperature bypass High speed vapor detection with low temperature bypass

G - Physics

01

N

150/20, 73/97

G01N 30/06 (2006.01) G01N 1/22 (2006.01) G01N 30/46 (2006.01) G01N 30/84 (2006.01) G01N 31/12 (2006.01) G01N 33/22 (2006.01) G01N 21/76 (2006.01) G01N 30/74 (2006.01)

Patent

CA 2037862

Disclosed are a method and apparatus for high speed, selective detection of vapors of specific compounds, particularly nitrogen-containing compounds, utilizing a bypass branch and high speed gas chromatography for improved selectivity and sensitivity of detection. A system with two gas chromatographs (GC's) alternating in series with two pyrolyzers provides two time intervals of detection in a downstream detector, with the second time interval containing signals delayed and further separated relative to signals from the first time interval. The bypass branch, in diverting a portion of the flow of gas samples from passage through the second gas chromatograph and second pyrolyzer, avoids interferences in the first time interval of detection from non-GC-retained compounds decomposed in the second pyrolyzer.

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