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Thread: Ph probe bad.

  1. #1
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    Ph probe bad.

    So this morning at about 4:30 am my ph dropped to 7.06 then fell to 2.08 at 5:00 am. Grabbed the ph pen it was reading 7.9. Unplugged the probe and reconnected it no change. I would say the probe went bad. I calibrated it over the weekend and has been writing fine.

  2. #2
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    Clean the BBC connector. That behavior is indicative of corrosion on the pin.

    You might be an engineer if...You have no life and can prove it mathematically.

  3. #3
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    Strange as i don't have it in the cabinet of the tank. But, i will clean it. I even unplugged it from the pm 1 module and itstayed at 2.08.

  4. #4
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    Took the bnc off and it was clean as a can be. So i guess i will order a few one.

  5. #5
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    Well, got the new ph probe today. Calibrated the probe with 7.01 and 10.1 calibration fluid. I can get it calibrated but, when i put the probe in the tank it reads 6.30. I check with a hand held ph pen it reads 7.8.
    When I put the probe back in the 7.01 calibration fluid it reads 7.12. Not sure what is going on.

  6. #6
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    The most likely (in order of likelihood) would be there were bubbles during calibration (redo calibration), you didn't wait long enough for the value to settle (redo calibration), or possibly stray voltage in the tank (check with voltmeter).

    You might be an engineer if...You have no life and can prove it mathematically.

  7. #7
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    Ok, i did recalibrate multiple times and double checked with ph pen. I can pit the probe in the calibration fluid and reads 7.01 aslo with the 10.01.

    I checked for stray voltage and founnd none.

  8. #8
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    That is an odd one then. May be time to contact support and/or try a new probe.

    You might be an engineer if...You have no life and can prove it mathematically.

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