Method for collecting exhaust gases
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United States of America Patent
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Dec 24, 2002
Issued Date -
N/A
app pub date -
Jul 3, 2002
filing date -
Dec 28, 1999
priority date (Note) -
Expired
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Abstract
A sample of gaseous constituents, to be used in e.g. emissions testing, is collected within an inner bag 86 having a wall 92 that allows limited diffusion of at least one of the gaseous constituents therethrough. A control gas is then collected into an outer bag 82 that defines an auxiliary chamber 94 between the wall and the outside environment. The control gas controls the rate of diffusion of the at least one constituent through the wall and into the outside environment.
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