Isothermal flow controller for air sampler

Details Isothermal flow controller for air sampler Isothermal flow controller for air sampler

1998-05-08

1999-04-06

Raevis, Robert

Measuring and testing

Sampler, sample handling, etc.

Automatic control

G01N 124

Patent

active

058921605

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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Hughes, "New Laminar Flowmeter", Instruments & Control Systems, vol. 35, pp. 98 to 100, 1992.

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