Electric heating – Heating devices – With power supply and voltage or current regulation or...
Patent
1992-01-24
1994-04-05
Paschall, Mark H.
Electric heating
Heating devices
With power supply and voltage or current regulation or...
219499, 219505, 219413, 219491, 73 2325, H05B 102
Patent
active
053007581
ABSTRACT:
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. Also disclosed is an arrangement for rapid, precise heating of vapor concentrator tubes in which vapors are rapidly focussed and then injected into a GC, and for rapid, precise heating of the GC's.
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Hail et al, "Compact Gas Chromatograph Probe For Gas Chromatograph/Mass Spectrometry Utilizing Resistively Heated Aluminum-Clad Capillary Columns", Anal. Chem. 1989, vol. 61, Nov. 1, 1989, pp. 2410-2416.
Achter Eugene K.
Gernes David B.
Lieb David P.
Rounbehler David P.
Tafreshi Abdul
Messenger Herbert
Paschall Mark H.
Thermedics Inc.
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