An improved temperature compensated electrochemical gas...

G - Physics – 01 – N

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G01N 27/416 (2006.01) G01N 27/49 (2006.01)

Patent

CA 2209784

An Electrochemical Gas Sensor having a temperature sensitive element such as a thermistor arranged within the gas sensor in a temperature insulative fashion for preventing any variations in the temperature of the applied gases to be sensed to be immediately conveyed to the temperature sensitive element thereby providing accurate temperature compensation signals to be combined with the generated sensor electrical output signals. The temperature sensitive element or thermistor is mounted in a heat sink to the expansion membrane of the gas sensor to be responsive only to changes in the temperature variations imparted by the sensor electrolyte and not by the variations in the temperature of the gas sensor body and associated elements thereby providing correct temperature compensation signals without error producing time delays.

L'invention est un détecteur de gaz électrochimique comportant un élément thermosensible interne, tel qu'une thermistance, cet élément étant doté d'un dispositif d'isolement thermique servant à empêcher les variations de température des gaz à détecter de se transmettre immédiatement à lui, ce qui permet d'obtenir des signaux de correction précise des effets dus à la température à combiner aux signaux de sortie du détecteur. L'élément thermosensible ou la thermistance est monté dans un dissipateur de chaleur sur la membrane d'expansion du détecteur de gaz pour n'être sensible qu'aux variations de température dues à l'électrolyte du détecteur et non aux variations de températures de la carcasse de ce dernier et des éléments connexes, ce qui permet d'obtenir des signaux de correction exacte des effets dus à la température exempts de retards pouvant produire des erreurs.

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