Gas sensor arrangement

Details Gas sensor arrangement Gas sensor arrangement

G - Physics

01

N

G01N 27/16 (2006.01)

Patent

CA 2588432

A gas sensor arrangement for detecting a combustible gas comprises a detector wire in thermal contact with a catalyst and a compensator wire. The wires are in the form of pellet resistors (pellistors) and in a constant current bridge arrangement. An electrical circuit connected to the detector wire and to the compensator wire is arranged to detect a difference between the resistance of the detector wire and the resistance of the compensator wire to provide an output signal to indicate the presence of a combustible gas. The electrical circuit is further arranged to derive a correction signal from a measurement of the resistance of the compensator wire for correcting the output signal for temperature variation. The ambient temperature is thereby measured using the voltage across the compensator wire. The correction can be implemented in hardware or software.

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