| 摘要 |
PROBLEM TO BE SOLVED: To provide an oxygen concentration-measuring device capable of preventing an individual difference in measurement accuracy of oxygen concentration in a zirconia element and suppressing occurence of variations in products as an oxygen sensor.SOLUTION: An oxygen concentration-measuring device includes: a zirconia element connected to an external electrode on the side of contacting with a measuring gas as a measuring target and an internal electrode on the side of contacting with a reference gas, respectively, for generating an electromotive force according to a difference between the oxygen concentration of the measurement gas and the oxygen concentration of the reference gas; a first platinum electrode connected to the external electrode; and a second platinum electrode connected to the internal electrode. A tip part of the second platinum electrode is bent along a contact surface with the internal electrode and is formed in a shape, for example, a spiral enabling surface contact with the internal electrode. |
