Measuring and testing – Gas analysis – By thermal property
Patent
1998-10-08
2000-11-21
Williams, Hezron
Measuring and testing
Gas analysis
By thermal property
73 2329, 73 232, 422 88, 422 93, G01N 3106, G01N 2556, G01N 700
Patent
active
061486590
ABSTRACT:
A gas concentration monitor has a pneumatic bridge having two parallel flowpaths containing a first conduit leg and a second conduit leg connected to an input line. Each leg has an entry orifice and an exit orifice through which a portion of the gas sample flows. Orifices need not be of equal size and or kept at the same temperature. A pump is connected to both legs for drawing the sample through the bridge. A condenser or absorber which removes the gas whose concentration is being determined is connected to the first leg between the entry orifice and the exit orifice. A differential pressure gauge measures the differential pressure between the first leg and the second leg which differential pressure changes due to removal of the target gas of measurement interest from the other gas fraction passing through the bridge towards discharge from the bridge. From that measurement one can calculate the concentration in the sample of the gas that was removed by the condenser or absorber.
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Wiggins J. David
Williams Hezron
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