Method for judging the failure or end of life of a sensor element
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United States of America Patent
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Jun 20, 2000
Grant Date -
N/A
app pub date -
Sep 30, 1998
filing date -
Sep 30, 1997
priority date (Note) -
Expired
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Abstract
In the present sensor element failure or end of life judging method, the internal impedance of a gas sensor element is measured and, if the thus measured internal impedance goes beyond a previously determined threshold value, then it is judged that the gas sensor element fails or comes to the end of life.
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