Apparatus for detecting combustible gases

Details Apparatus for detecting combustible gases Apparatus for detecting combustible gases

1976-08-16

1977-08-30

Scovronek, Joseph

Chemistry: physical processes

Physical processes

Crystallization

338 34, G01N 2716

Patent

active

040451771

ABSTRACT:
This is an improvement in apparatus for detecting combustible gases, such as methane, that embodies a Wheatstone bridge circuit including a refractory-coated reference element constituting one leg of the bridge and a refractory-coated detector element having thereon a catalyst for promoting oxidation of the combustible gas to be detected constituting a second leg of the bridge. Upon oxidation of combustible gas at the detector element the temperature and resistance thereof increases relative to the reference element to unbalance the bridge, thereby producing an electrical signal proportional to the amount of combustible gas being oxidized. This invention improves the stability, linearity, and stabilization time of the bridge signal by constructing the reference element so that at zero percent combustible gas or during oxidation of the combustible gas at the detector element the radiant energy of both the detector and reference element are substantially equal.

REFERENCES:
patent: 3092799 (1963-06-01), Baker
patent: 3117843 (1964-01-01), Baker
patent: 3200011 (1965-08-01), Baker
patent: 3564474 (1971-02-01), Firth et al.

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