A systematic survey to realize high sensitivity of a limiting current type hydrocarbon (HC) sensor with two inner electrodes has been made. The characteristics of electrodes were examined for various electrode materials of sensors with one or two cathodes in a room which was constructed with an yttria stabilized zirconia pellet and a cover with a pinhole. From these examinations, the sensor having two inner electrodes Pt-Ag and an outer electrode Au was expected to have the highest sensitivity. This expectation was confirmed by an examination after constructing an actual sensor.
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