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>  From: "George M. Irvine III" <gmiiii@in*.co*>
>  
>      Tim, moisture will cause the sensor to read high and erraticly.
>  Oxygen is the "fuel" for these sensors, so just keep it from it's
>  fuel and it will last longer. Otherwise , it is always working. They
>  will eventually also short out internally if exposed to humidity,and
>  will the read zero all of the time. I have used these devices for several
>  years, and find that just keping the sensor separate in a small container
>  or plastic bag, away form temperature extremes is the best bet for
>  longevity, but with constant use, they only last a little more than
>  a year. - G

Hi George.  A couple more questions...

  1. When "a little more than a year" approaches, what are the
     signs that the sensor is starting to wear out?  How long
     is it from when you first see signs of aging to when it 
     becomes "a problem"?

  2. Since you've learned to project approximately when the 
     sensor will wear out, do you wait to see the signs of it
     occurring, or do you pitch the aging sensor *before* you
     start to see the signs?

Thanks.

- Todd

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