Sampling device for gas analyzers

Details Sampling device for gas analyzers Sampling device for gas analyzers

1995-03-24

1997-02-18

Williams, Hezron E.

Measuring and testing

Sampler, sample handling, etc.

With heating or cooling

7386343, 73863514, 7386358, 7386381, G01N 122

Patent

active

056043198

ABSTRACT:
A sampling device for a gas analyzer in which a constant-rate flow of diluted sample gas is sampled by a constant-volume sampling device. A gas inlet port of a sampling passage of the constant-volume sampling device is positioned in a throat portion of a main venturi tube, or slightly upstream or downstream of the throat portion. A cold trap is provided downstream of the sampling passage to collect and supply a portion of the sampled gas to be analyzed. The velocity of the diluted sample gas in the throat portion of the main venturi tube is approximately Mach one, so that the sampling thereof is unaffected by pressure or flow-rate changes elsewhere in the system.

REFERENCES:
patent: 3699814 (1972-10-01), Kaufman
patent: 3784902 (1974-01-01), Huber
patent: 3996008 (1976-12-01), Fine et al.
patent: 4317379 (1982-03-01), Oberlander et al.
patent: 4383839 (1983-05-01), Sisti et al.
patent: 4660408 (1987-04-01), Lewis
patent: 5014541 (1991-05-01), Sides et al.
patent: 5184501 (1993-02-01), Lewis etal.
patent: 5337595 (1994-08-01), Lewis

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