| 摘要 |
PROBLEM TO BE SOLVED: To provide a multi-gas sensor and a multi-gas sensor device which can suppress deterioration of measurement accuracy of NO concentration, NOconcentration, and NHconcentration.SOLUTION: A multi-gas sensor comprises: an NOx sensor part 11 for measuring concentration of nitrogen oxide contained in gas to be measured; a first ammonia sensor part 21 and a second ammonia sensor part 22 for measuring ammonia contained in the gas to be measured; and a heater part 19 for heating the NOx sensor part 11, the first ammonia sensor part 21 and the second ammonia sensor part 22. The first ammonia sensor part 21 and the second ammonia sensor part 22 consist of the same components, and the second ammonia sensor part 22 is disposed in an area inside a sensor element part 10 where its temperature is lower than that of the first ammonia sensor part 21. |
