Importance

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Abstract

The dual mode gas sampler and pneumatic flow control system of the present invention includes a flow control valve having a manually adjustable flow restricting orifice, a two position mode select valve, a flow controller and a vacuum pump for drawing gas from the atmosphere through a load representing either a single test article with flow being held constant or multiple test articles with pressure held constant. In one position of the mode select switch the flow controller maintains mass flow through the load constant by regulating a supplemental flow of gas from the discharge side of the pump to the suction side of the pump in response to the pressure differential across the flow restricting orifice. In the other position of the dual mode switch the flow controller regulates the supplementary flow of gas from the discharge side to the suction side of the pump in response to the pressure differential across the pump with the flow control valve bypassed.

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First Claim