Coating processes – Measuring – testing – or indicating – Thickness or uniformity of thickness determined
Patent
1980-12-30
1983-11-22
Smith, John D.
Coating processes
Measuring, testing, or indicating
Thickness or uniformity of thickness determined
252466PT, 427 49, 427101, 427116, 4271264, 427125, 427229, G01N 2716
Patent
active
044169116
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 for inducing catalytic oxidation of flammable gases 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
International Gas Detectors Limited
Smith John D.
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