Abstract
The influence of moisture in a test gas containing was investigated for a gas sensor using a mixed measuring electrode and a composite conductor of sodium superionic conductor, 40 wt % For dried gas, the electron number (n) for the reaction on the electrodes was 1.86 which was very close to the theoretical value When water vapor was added to the measuring gas, the electromotive force (emf) significantly decreased, since the gas concentration was reduced by the reaction with the gas. Based on the calibration curve observed from the relationship between emf and concentration at 450°C under dry conditions, it is suggested that the sensor can determine parts per billion levels of gas under ambient conditions. Experimentally, the observed response time became faster with an increase in the flow rate and mainly depended on the exchange time of the test gas. © 2002 The Electrochemical Society. All rights reserved.
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