Chemical apparatus and process disinfecting – deodorizing – preser – Analyzer – structured indicator – or manipulative laboratory... – Means for analyzing gas sample
Patent
1983-07-22
1984-08-07
Marcus, Michael S.
Chemical apparatus and process disinfecting, deodorizing, preser
Analyzer, structured indicator, or manipulative laboratory...
Means for analyzing gas sample
338 34, 422 97, 427125, 4271264, G01N 2716
Patent
active
044643390
ABSTRACT:
A gas sensor element for detecting the presence of a flammable gas comprises an electrical resistance filament surrounded by a bead which is formed by an array of alumina particles interspersed between and bound together only by particles of a catalyst to form an open porous gas diffusive skeletal matrix having a mean particle size of less than 20 nm. When the bead includes such a matrix, the number of active sites at which catalytic oxidation of flammable gases can take place is greatly increased with the result that the sensor element is very resistant to poisoning by atmospheric contaminants such as traces of silicone and sulphur compounds. The sensor thus has a very much longer life and does not require such frequent recalibration.
REFERENCES:
patent: 4068021 (1978-01-01), Allman
patent: 4132673 (1979-01-01), Yamaguchi
patent: 4303612 (1981-12-01), Sonley
patent: 4402996 (1983-09-01), Gauger et al.
Gzybowski Michael S.
International Gas Detectors Limited
Marcus Michael S.
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