Isothermal flow controller for air sampler

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

G - Physics

01

F

G01F 1/34 (2006.01) G01N 1/22 (2006.01) G01N 1/24 (2006.01)

Patent

CA 2266061

A method and apparatus for measuring gas flow in a gas sampling device including a vacuum pump which generates pulsations and the gas flow is disclosed. The exhaust from the vacuum pump is passed through a tube having an internal diameter of about 1 mm to about 5 mm, and the length of about 10 mm to about 150 mm under substantially isothermal conditions. Pulsations in the gas flow are dampened in the pulsation damper located at the upstream end of the tube. The pressure is measured at the upstream end of the tube and the gas flow is derived from a predetermined relationship between the gas flow and the tub under substantially isothermal conditions and the upstream pressure in the tube, the large bore of the tube, allows dust particles to pass through the system rather than clog up small air passage ways. The method and apparatus of the invention provide a simple means for measuring air or gas sample flow by neutralising the effect of the back pressure caused by the pump strokes.

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