Solid state sensor for carbon monoxide

G - Physics – 01 – N

Patent

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Details

G01N 33/00 (2006.01) G01N 27/12 (2006.01)

Patent

CA 2498864

A method of detecting a predetermined alarm condition in a combustion emission gas. The method comprises exposing to the gas a semiconductor gas sensor having a p~-type mixed metal oxide semiconducting material of the first, second and/or third order transition metal series, the semiconducting material being responsive both to a change in concentration of a reducing gas in the surrounding atmosphere and to a change in concentration of oxygen in the surrounding atmosphere to exhibit a change in its electrical resistance. The resistance is monitored and an alarm signal is output if the resistance exceeds a predetermined value corresponding to the alarm condition.

L'invention concerne un procédé de détection d'un état d'alarme prédéterminé dans un gaz d'émission de combustion. Ce procédé consiste à exposer au gaz un détecteur de gaz semiconducteur comprenant une matière semi-conductrice d'oxyde métallique mélangé des séries de métal de transition de métal de transition de premier, second et/ou troisième ordre. La matière semi-conductrice est responsable d'un changement de la concentration d'un gaz de réduction dans l'atmosphère ambiante et d'un changement de la concentration d'oxygène dans l'atmosphère ambiante pour présenter un changement dans la résistance électrique. La résistance est contrôlée et un signal d'alarme est déclenché si la résistance dépasse une valeur prédéterminée correspondant à l'état d'alarme.

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