Fluid handling – Self-proportioning or correlating systems – Mixture condition maintaining or sensing
Patent
1994-02-01
1996-07-30
Rivell, John
Fluid handling
Self-proportioning or correlating systems
Mixture condition maintaining or sensing
137 7, 137607, 137898, 25112905, 251210, G05D 1113
Patent
active
055402518
ABSTRACT:
Apparatus and methods for precision batch or continuous flow blending of gases are described. Pulsatile precision metering valves having substantially zero dead space are employed to introduce gases to a mixing chamber or manifold in predictable uniform quantities to achieve precision gas blends according to predetermined criteria. During batch processing, gases to be blended are repeatedly characterized by the change in mixing vessel pressure with respect to time immediately after blending. Estimates of additional amounts of a given gas to be added to achieve a desired final partial pressure of the given gas in the mixing vessel are based on empirical data previously measured and stored for the gas in question.
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