Portable gas detector

Details Portable gas detector Portable gas detector

1981-06-12

1982-06-01

Marcus, Michael S.

Chemical apparatus and process disinfecting, deodorizing, preser

Analyzer, structured indicator, or manipulative laboratory...

Means for analyzing gas sample

338 34, 23232E, G01N 2716

Patent

active

043327729

ABSTRACT:
An improvement is provided in a portable gas detector used to detect combustible gases, such as methane, which embodies a Wheatstone bridge circuit including a refractory-coated detector element having thereon a catalyst for promoting oxidation of the combustible gas to be detected constituting one leg of the bridge and a refractory-coated reference element constituting a second leg of the bridge. The improvement consists in the application of a cobalt oxide coating to the reference element, whereby the occurrence of spurious signals by the Wheatstone bridge circuit due to causes other than the presence of a combustible gas is greatly reduced, if not completely eliminated.

REFERENCES:
patent: 2904765 (1959-09-01), Seehof et al.
patent: 2930016 (1960-03-01), Weston et al.
patent: 3077774 (1963-02-01), McIlvaine
patent: 3890703 (1975-06-01), Frazee et al.
patent: 4045177 (1977-08-01), McNally
patent: 4123225 (1978-10-01), Jones et al.

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