Chemical sensor with diffusion barrier

G - Physics – 01 – N

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G01N 27/26 (2006.01) A62B 18/02 (2006.01)

Patent

CA 2201613

A diffusion rate limited amperometric electrochemical sensor is provided. The sensor has at least two electrodes, an external circuit connected to said electrodes, an electrolyte capable of conducting ionic charge between electrodes, and a diffusion barrier coextensive with or covering one of said electrodes, said diffusion barrier being a porous membrane containing within the pores of the membrane a low vapor pressure liquid phase in which a gas to be detected is soluble. Also provided are respirators, personal exposure indicators and environmental indicators, as well as a method of sensing the presence of gas in the air and a method of preparing the sensor.

L'invention concerne un capteur électrochimique ampérométrique à vitesse de diffusion limitée. Ce capteur comporte au moins deux électrodes, un circuit externe connecté à ces dernières, un électrolyte conduisant la charge ionique entre les électrodes, et une barrière de diffusion coïncidant avec une desdites électrodes ou la recouvrant, et constituée d'une membrane poreuse contenant dans ses pores une phase liquide à faible pression de vapeur dans laquelle le gaz à détecter est soluble. L'invention porte également sur des respirateurs, des exposimètres individuels et des indicateurs environnementaux, ainsi que sur des procédés de détection de la présence de gaz dans l'air et un procédé de préparation du capteur.

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