| 摘要 |
A gas sensor arrangement for detecting a combustible gas comprises a detecto r wire in thermal contact with a catalyst and a compensator wire. The wires ar e 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 o f 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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