发明名称 |
Method of treatment of sensor element and sensor element |
摘要 |
Method to improve the followability of a NOx signal of a NOx sensor relative to a variation in a NOx concentration, and to prevent occurrence of a defect caused by this process. A method of processing a sensor element includes the steps of: (a) preparing a gas atmosphere containing hydrocarbon, having an air-fuel ratio of 0.80 to 0.9999, and having a small amount of oxidizing gas added thereto; and (b) subjecting a sensor element to a heat treatment in the gas atmosphere at a temperature of 500°C or higher for 15 minutes or longer. The sensor element includes an electrochemical pumping cell constituted of an oxygen-ion conductive solid electrolyte and an electrode having a NOx reduction ability. A NOx gas in a measurement gas is reduced or decomposed in the electrode. A NOx concentration in the measurement gas is obtained based on a current which flows in the electrochemical pumping cell at a time of the reduction or decomposition. |
申请公布号 |
EP2378284(A1) |
申请公布日期 |
2011.10.19 |
申请号 |
EP20110250348 |
申请日期 |
2011.03.18 |
申请人 |
NGK INSULATORS, LTD.;NGK CERAMIC DEVICE CO., LTD. |
发明人 |
Ishikawa, Tetsuya;Horisaka, Sumiko;Okuda, Yuji |
分类号 |
G01N27/407 |
主分类号 |
G01N27/407 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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