| CPC G01M 15/102 (2013.01) [F01N 11/007 (2013.01); F01N 2550/02 (2013.01); F01N 2900/04 (2013.01); F01N 2900/0418 (2013.01); F01N 2900/0422 (2013.01); F02B 77/083 (2013.01); F02B 77/086 (2013.01); G08B 21/182 (2013.01)] | 17 Claims |

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1. A system for monitoring measured NOx values in an exhaust component, comprising a first NOx sensor having a first predetermined maintenance interval and a second NOx sensor having a second predetermined maintenance interval
characterized in that
the first and second NOx sensors are configured such that their first and second maintenance intervals are staggered.
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6. A method for monitoring measured NOx values in an exhaust component, comprising the steps of:
installing a first NOx sensor having a first predetermined maintenance interval in an exhaust component
installing a second NOx sensor having a second predetermined maintenance interval after the first NOx sensor has been operating for a predetermined operation duration such that the first and second maintenance intervals are staggered.
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