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Old 04-29-2013, 05:01 AM   #1
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Default Auber PT100 jumping around by 4 degrees

It's the one on the outlet of my HLT, screwed into the tee in a Kal-style build. It jumps around by 3 or 4 degrees all the time now, going from say 149 to 152 to 150 to 153 to 151 to 149 etc. It's not the cable or the PID because plugging a different PT100 (like the one in my BK) into the same cable does not jump around.

What can go wrong with the RTD itself that might cause this, and do I need to get a new one? It's only about 3 months old. Thanks!

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Old 04-29-2013, 03:37 PM   #2
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Did you try autotuning? Mine was doing the same thing but it was when I switched to a smaller probe. After I autotuned it was spot on again

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Old 04-29-2013, 04:56 PM   #3
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Could there be a wet connection somewhere? That has caused me issues in the past.

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Old 05-01-2013, 11:12 PM   #4
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Quote:
Originally Posted by stlbeer View Post
Could there be a wet connection somewhere? That has caused me issues in the past.
Don't think so, it happens even a day or two after brewing, and when the system is dry. I'll try an autotune though.
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Old 05-02-2013, 12:03 AM   #5
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must be the probe. I swapped it out for a different one (still auber pt100 but smaller threads plus a bushing) and this one doesn't jump around. I'll probably send it back to auber and see what the say.

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Old 05-02-2013, 12:21 PM   #6
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Erratic readings means the electronics is sensing varying resistance. When that happens in my brewery the answer is always dirty/oxidized/wet/wort stained contacts in the plugs that connect the RTD's to the controllers. No guarantee that this is what is plaguing you but check/clean all connections/connectors.

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Old 05-03-2013, 05:29 PM   #7
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The auto parts store will have "electrical contact cleaner" which you could spray on the RTD and the cable to eliminate a connection problem.

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