| 摘要 |
Apparatus for detecting a combustible gas which comprises a Wheatstone bridge circuit having a detector element comprising an electrically conducting member coated with a refractory and having on the surface of said refractory a catalyst for the oxidation of said gas, said detector element constituting one leg of said bridge, and a reference element comprising an electrically conducting member coated with a refractory, said reference element constituting a second leg of said bridge, whereby upon catalytic oxidation of said gas an electrical signal approximately proportional to the amount of said gas present at the detector element is produced. The improvement comprises a reaction control block having a cover in the form of a dust shield and having two chambers, one containing said detector element, and the other containing said reference element. A partition is contained in said block parallel to and spaced from said dust shield to form a plenum space therebetween said partition having a pair of opening means, each communicating with one of said chambers to provide communication with said plenum space to limit the diffusion of the combustible gas so as to control the reaction rate at the detector element and improve the characteristic of the detector.
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