| 摘要 |
PURPOSE: To simplify the structure of a sensor by using ceramic with alkaline earth metal carbonate as a main constituent as solid electrolyte and using carbon dioxide gas generated by the dissociation decomposition of carbonate constituting the solid electrolyte as a reference gas. CONSTITUTION: Carbon dioxide gas generated by the dissociation decomposition of carbonate constituting solid electrolyte 2 is confined as a reference gas 8 at the tip of a reference electrode 3 of a part buried into the solid electrolyte 2 and is generated by the thermal dissociation reaction when the temperature of a sensor increases to the use temperature. Then, a measurement electrode 1 is exposed to an atmosphere for measuring the concentration of the carbon dioxide gas and electromotive force based on the temperature difference between the carbon dioxide gas reference gas 8 and a measurement gas is measured by a potentiometer 7, thus measuring the concentration of carbon dioxide gas in the measurement gas and hence eliminating the need for providing a solid reference substance and for supplying the reference gas into the reference electrode. As a result, the structure can be simplified and at the same time the concentration of carbon dioxide gas can be stably and accurately measured. |
