Catalytic sensor

G - Physics – 01 – N

Patent

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Details

G01N 27/16 (2006.01)

Patent

CA 2426420

A combustible gas sensor includes an active element in electrical connection with a measurement circuit. The measurement circuit includes a thermistor network to compensate for the effect of changes in ambient temperature to the resistance of the active element. Another combustible gas sensor includes an active element having a geometric surface area no greater than approximately 0.5 mm2 in electrical connection with a measurement circuit. The measurement circuit includes a compensator that compensates for the effect of changes in ambient temperature to the resistance of the active element without compensating for heat lost by thermal conduction from the active element. A method of sensing gas including the steps of: (i) providing a catalytic active element having a geometric surface area sufficiently small such that the effect upon the output of the actibe element of heat lost from the active element by thermal conduction is relatively small, and (ii) compensating for only the effect of changes in ambient temperature upon the output of the active element.

Ce détecteur de gaz combustible comporte un élément actif en connexion électrique avec un circuit de mesure. Ce dernier est pourvu d'un réseau de thermistances destiné à compenser les effets d'un changement de température ambiante de la résistance de l'élément actif. Un autre détecteur de gaz combustible comporte un élément actif ayant une surface géométrique active, ne dépassant pas environ 0,5 mm?2¿, en connexion électrique avec un circuit de mesure. Ce dernier comporte un compensateur corrigeant les effets susmentionnés et ce, sans modifier la perte thermique due à la conduction thermique provenant de l'élément actif. Le procédé de détection de gaz selon cette invention consiste, (i), à utiliser un élément catalytique actif dont la surface géométrique active est suffisamment réduite pour que l'effet de la déperdition de chaleur provenant de l'élément actif sur sa sortie soit relativement réduit et, (ii), à ne compenser que les effets des changements de la température ambiante sur la sortie de l'élément actif.

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