Vacuum dilution extraction gas sampling method

Measuring and testing – Sampler – sample handling – etc. – Capture device

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7386383, 7386323, 73 2331, G01N 124

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active

052974324

ABSTRACT:
A gas sampling system utilizing a pair of parallel sonic orifices. One of the orifices is connected to a source of filtered, heated samples. The second, larger orifice is connected to a source of dilution gas. A vacuum pump maintains a substantial vacuum behind the orifices, thus assuring critical flow therethrough. The sample and diffusion gas are mixed behind the orifices and transported under partial vacuum for analysis. The dew point of the sample is affected by both the ratio of the diameter of orifices and the degree of vacuum transporting the gas mixture. As such, the dew point can be varied indefinitely by any reasonable combination of orifice ratio and vacuum pump strength.

REFERENCES:
patent: 3817100 (1974-06-01), Anderson et al.
patent: 3965749 (1976-06-01), Hadden et al.
patent: 4823591 (1989-04-01), Lewis
patent: 5184501 (1993-02-01), Lewis et al.
Richard L. Myers and Donald Vernon, "Field Experiences Using Dilution Gas Probe Techniques for Continuous Source Emission Monitoring," Proceedings of the Controls West Conference, pp. 347-355, submitted to the International Industrial Controls Conference and Exhibition/Controls West '85, Long Beach Convention Center, Long Beach, California, Sep. 16-18, 1985.
"Model 797: Diluting Stack Sampler," EPM Environmental Product Brochure 5 pages; published by Feb. 1992.
"Chapter 6: Extractive System Design," EPA Handbook: Continuous Air Pollution Source Monitoring Systems, pp. 6-1 to 6-18 (Jun. 1979).
"Inertial Dilution System: AR-120", Anarad Inc., Santa Barbara, California 2 pages published by Nov. 1992.

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