Colorimetric gas diffusion testing tube

Details Colorimetric gas diffusion testing tube Colorimetric gas diffusion testing tube

1986-01-30

1990-08-07

Warden, Robert J.

Chemical apparatus and process disinfecting, deodorizing, preser

Analyzer, structured indicator, or manipulative laboratory...

Sample mechanical transport means in or for automated...

422 83, 422 86, 422 88, 436126, 436902, G01N 3122

Patent

active

049466496

ABSTRACT:
A colorimetric gas diffusion testing tube is disclosed that is to be opened at one end and that contains a granular indicator layer. The testing tube detects a gas that does not directly change the color of the indicator layer. When the tube is viewed from the end which is to be opened, the indicator layer that is adjacent the opening end is inert to the gas that is to be detected. The indicator layer is followed by a porous reagent layer for converting this gas into the substances that change the color of the indicator layer.

REFERENCES:
patent: 3312527 (1967-04-01), McConnaughey
patent: 3507623 (1970-04-01), McConnaughey
patent: 4159304 (1979-06-01), Shono
patent: 4271125 (1981-06-01), Leichnitz
patent: 4528160 (1985-07-01), Eckstein et al.
patent: 4595011 (1986-07-01), Phillips
Detector Tube Handbook, Dragerwerks, Germany, (1979), 4th Ed., pp. 8-25, 150-153.

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