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some_guy  
#1 Posted : Monday, December 4, 2017 9:01:49 AM(UTC)
some_guy

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Joined: 5/19/2016(UTC)
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What can cause an intermittent failure from a Type-J temperature probe?
some_guy  
#2 Posted : Monday, December 4, 2017 9:29:52 AM(UTC)
some_guy

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Joined: 5/19/2016(UTC)
Posts: 1

Oxidation of the connector!

If the type-J probe is deployed/mounted in a moist environment, eventually (after a number of years) you may observe an intermittent failure of the probe signal to get all of the way to the BeerBotz input connector. This is caused by a film of rust/oxidation on the leads on both the male (probe side) and female (wire side) of the connector. The problem normally goes away by unplugging/plugging the connector the a few times to scratch the metal surfaces and create metal-to-metal contact again.

These signal dropouts should be avoided because they make the graphs look bad. The BeerBotz system reports a value of 465 degrees F (max. temperature) when there is no probe connected (invalid input). The status light for the input on the BeerBotz interface will also turn red. 465 is chosen specifically because this is recognizable as an error on the graph. You can always clean up the graph by deleting these erroneous entries in the spreadsheet.

You can also clean the male side of the connector with fine sandpaper (220 grit). You can't really clean the inside of the female connector though, so replacement of the connector is the only option if this issue becomes a problem.
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