Apparatus and method for measuring the concentration of gases

Details Apparatus and method for measuring the concentration of gases Apparatus and method for measuring the concentration of gases

G - Physics

01

N

340/124, 25/139,

G01N 27/12 (2006.01)

Patent

CA 1178456

Abstract of the Disclosure A gas sensing apparatus is adapted to detect the presence of a gas of interest in air in very small quantities and to provide a rapid alarm or other indication in response to the presence of such gas. The apparatus incorporates a gas sensing composition which changes its electrical resistance more dramatically than previously possible in response to the presence of the gas and electronic circuitry designed to sense and evaluate the patterns of resistance change during the first approximately 30 seconds after exposure to gas and to accurately estimate gas concentration based on such initial resistance variations. The system also looks at overall change in sensor resistance to detect gradually increasing gas levels. A pre- ferred method of manufacturing the sensor and a sensor con- figuration particularly suited to the early detection of gas levels are disclosed.

397096

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