| 摘要 |
PURPOSE:To enhance the accuracy of measurement and to increase response speed by providing porous electrodes and fine particles of a solid electrolyte, etc., and operating the title sensor at a relatively low temp. CONSTITUTION:The electromotive force based on a difference between the oxygen partial pressures of a reference gas of a known oxygen partial pressure and a gas to be measured is generated between the porous electrodes 2 and 3 when the above-mentioned reference gas is introduced into the sensor from a reference gas introducing pipe 9 and the gas to be measured is introduced into an outside pipe 8. This electromotive force is, therefore, measured by an electromotive force meter 10 to determine the oxygen partial pressure of the gas to be measured. The gaseous oxygen in closed cells 7 is discharged by the oxygen pump effect of the fine particles 5 of the solid electrolyte or the gaseous oxygen is introduced therein from the contact gas even if the closed cells 7 exist in the electrodes 2, 3 and, therefore, the oxygen partial pressure of the gas in the cells 7 equilibrates rapidly with the oxygen partial pressure of the contact gas. The sensor is operated at the relatively low temp. in such a manner. The accuracy of the measurement is thus enhanced and the response speed is increased. |
