A gas sensor

Details A gas sensor A gas sensor

G - Physics

01

N

G01N 27/12 (2006.01) G01N 33/00 (2006.01) G01N 37/00 (2006.01)

Patent

CA 2109619

A gas sensor, for detecting the presence of a gas in a gas mixture, comprises two pairs of electrodes (1, 3; 2, 4) mounted on a sensing element (5) either with the electrodes of each pair spaced apart by a different amount, or with the relationship between the electrodes of one pair and the active surface of the sensing element being different in the case of each set. In use, the ratio of the electrical resistances accross the two pairs of electrodes it measured, and the measured values of this ratio are compared with a calibration curve indicating how the ratio varies with concentration of the gas to be detected.

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