Measuring and testing – Gas analysis – Gas chromatography
Patent
1996-12-04
1998-04-14
Brock, Michael
Measuring and testing
Gas analysis
Gas chromatography
7386361, G01N 122, G01N 33497
Patent
active
057394121
ABSTRACT:
The combination of the invention includes a mouthpiece 1 and a sample-taking system 8 for analyzing a gas sample. The mouthpiece 1 has a flow resistor 5 in the exhalation direction and a sample-taking connecting element 6 for the gas sample to be analyzed. The sample-taking system 8 has a pump and a through-flow measuring device 13. The pump pumps the sample gas flow from the sample-taking connecting element via a sample line 9 into a measuring chamber 15 of an analyzer 16. The combination is improved in such a manner that calibration is made possible with a calibrating gas flow greatly reduced compared to the flow of gas to be measured. This is achieved in that the sample-taking connecting element 6 is connected to the mouthpiece 1 forward of the flow resistor 5 viewed in the exhalation direction. The sample line 9 includes a flow throttle 11 in through-flow direction and an outlet opening 12 opening to the ambient. The through-flow measuring device 13 is connected to the sample line 9 forward of the flow throttle 11 as seen in the through-flow direction. The pump 14 takes the gas sample between the flow throttle 11 and the outlet opening 12.
REFERENCES:
patent: 4677987 (1987-07-01), Choksi
patent: 4736619 (1988-04-01), Legrand
patent: 5111827 (1992-05-01), Rantala
patent: 5143695 (1992-09-01), Van Den Burg
patent: 5321972 (1994-06-01), Stock
Sohege Jurgen
Stock Burkhard
Brock Michael
Dragerwerk Aktiengesellschaft
Ottesen Walter
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