DLco calibration syringe apparatus
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United States of America Patent
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Jul 9, 2002
Grant Date -
N/A
app pub date -
Dec 14, 1999
filing date -
Dec 14, 1999
priority date (Note) -
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Abstract
A calibration apparatus for checking the accuracy of DLco testing machines includes a pair of syringes mounted side by side in a frame and joined by a valve controlled gas passageway to a coupling adapted to mate with the testing machine. The first syringe receives gas from the testing machine and the second syringe has a chamber from which gas of a known concentration is returned to the testing machine. The chamber of the second syringe is flow connected by a valve to a source of test gas. The gas passageway is constructed in such a manner to reduce dead air space and to allow purging with test gas to eliminate contamination with ambient air or gas of previous tests.
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