| 摘要 |
PURPOSE:To improve the responsiveness by thermal decomposition of a low melting point compound at a specified temperature after it is formed by bringing lead, sulfer or the like into contact with a platinum electrode formed on the surface on the side of gas to be measured of a solid partition made of zirconium or the like. CONSTITUTION:Lead, calciom, zinc, sulfer, phosphor, chlorine or the like is brought into contact with the surface of a laminar platinum electrode formed on the surface on the side of gas to be measured of a solid state partition made of a zirconia sintered body or the like to form a low melting point compound between platinum. Then, the platinum electrode is heated up to 699-850 deg.C to decompose the low melting point compound from platinum. Such a treatment of the electrode activates the platinum electrode thereby improving the responsiveness of a sensor, particularly reducing the response time in the rich lean process by 20-50% as compared with the conventional method. |
