Gas sample chamber

Details Gas sample chamber Gas sample chamber

1991-11-18

1992-11-17

Raevis, Robert

Measuring and testing

Sampler, sample handling, etc.

With constituent separation

73 3102, 356437, G01N 100

Patent

active

051633329

ABSTRACT:
A diffusion-type gas sample chamber for use in a gas analyzer consists of an elongated hollow tube having an inwardly-facing specularly-reflective surface that permits the tube to function also as a light pipe for transmitting radiation from a source to a detector through the sample gas. A number of filtering apertures in the wall of the otherwise non-porous hollow tube permit the sample gas to enter and exit freely under ambient pressure. Particles of smoke and dust of a size greater than 0.1 micron are kept out of the chamber by use of a semi-permeable membrane that spans the apertures in the hollow tube. Condensation of the sample gas components is prevented by heating the sample chamber electrically to a temperature above the dew point of the component of concern.

REFERENCES:
patent: 3966439 (1976-06-01), Vennos
patent: 4155247 (1979-05-01), Kaczmarek et al.
patent: 4709150 (1987-11-01), Burough et al.
patent: 4749276 (1988-06-01), Bragg et al.
patent: 4800272 (1989-01-01), Harley et al.
patent: 4947578 (1990-08-01), Anderson et al.

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