| 摘要 |
PURPOSE:To detect the contaminated state of an oxygen sensor with good efficiency, by measuring the response characteristics of the sensor by flowing gas for use in inspection to the electrode part in the side of gas to be measured of the sensor in such a state that the sensor is arranged in gas to be measured. CONSTITUTION:Electrodes 4, 5 are respectively arranged both inner and outer surfaces of the semispherical bottom part 1a of a measuring pipe 1 made of zirconia of which the crystal structure is stabilized by yttria reference gas 12 such as air is blown into the space 2b of a fine tube 2 from a piercing orifice 7b while electromotive force between the electrodes 4, 5 is measured to measure the concn. of oxygen gas in gas 11 to be measured. In this oxygen gas sensor, a piercing orifice 7d is provided to a lid 7 and gas 13 for use in inspection is introduced into the side of the gas to be measured of the sensor from said orifice 7d. The response characteristics of the sensor are compared with that thereof when said sensor is not contaminated and measured to detect a contamination state. |
