Title:
ガスセンサ
Document Type and Number:
Japanese Patent JP3571494
Kind Code:
B2
Abstract:
A gas sensor is disclosed in order to decrease the offset value to a degree in which no trouble occurs in the measurement without causing any reduction of NOx so that the measurement accuracy for NOx is improved. In the gas sensor, NOx contained in a measurement gas introduced into a second chamber (60) is decomposed by means of catalytic action and/or electrolysis to pumping-process oxygen produced by the decomposition so that NOx is measured on the basis of a pumping current (Ip2) flowing through a measuring pumping cell (82) thereby. The gas sensor has the following pattern of a heater (94). That is, a minute pitch is provided for a pattern (94a) at a portion corresponding to the forward end of a sensor element (100), a coarse pitch is provided for a pattern (94b) at a central portion, and a pattern (94c) is removed at a portion corresponding to the backward end of the sensor element (100). Thus, the measuring pumping cell (82) is allowed to have a resistivity of electronic conduction of not less than 1 M OMEGA after conversion into a resistance value.
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Inventors:
Nobuhide Kato
Hiroshi Kurachi
Takeya Miyashita
Hiroshi Kurachi
Takeya Miyashita
Application Number:
JP13015397A
Publication Date:
September 29, 2004
Filing Date:
May 20, 1997
Export Citation:
Assignee:
Nippon Insulator Co., Ltd.
International Classes:
G01N27/41; G01N27/407; G01N27/416; G01N27/419; (IPC1-7): G01N27/416
Domestic Patent References:
| JP9113484A | ||||
| JP8338823A | ||||
| JP57187646A | ||||
| JP8029387A | ||||
| JP9113484A | ||||
| JP8338823A | ||||
| JP4264251A |
Attorney, Agent or Firm:
Takehiro Chiba
Tatsuhiko Sato
Tatsuhiko Sato