Isothermal flow controller for air sampler
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United States of America Patent
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Apr 6, 1999
Grant Date -
N/A
app pub date -
May 8, 1998
filing date -
May 8, 1998
priority date (Note) -
Expired
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Abstract
An air or gas sampling device utilizes a small tube calibrated under isothermal conditions. The relationship of pressure at the input end of the tube to flow is plotted and stored in a microprocessor for comparison with pressure monitored during sample pumping. Pulsations in flow caused by the air or gas pump can be neutralized by a damper comprising a small chamber having a diaphragm for one wall.
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