| 摘要 |
A gas sensor capable of reversibly and continuously measuring the concentration of a catalyst poison gas such as CO without specially needing recovering means such as a heater, and measuring the catalyst poison gas concentration without being affected by H<SUB>2</SUB>O concentration. The electrical circuit ( 15 ) of the gas sensor has an AC power supply ( 19 ) for applying an AC voltage between both electrodes ( 3 ), ( 5 ), an AC voltmeter ( 21 ) for measuring an AC voltage (AC effective voltage V) between the both electrodes ( 3 ), ( 5 ), and an AC ammeter ( 23 ) for measuring a current (AC effective current I) running between the both electrodes ( 3 ), ( 5 ). An impedance is determined from the AC effective voltage V and the AC effective current I generated when the AC voltage is applied to the both electrodes ( 3 ), ( 5 ). Since this impedance corresponds to the catalyst poison gas concentration, the catalyst poison gas concentration can be determined from the impedance by using a map showing the relation between the impedance and the catalyst poison gas concentration.
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