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Thread: Cond Probe problem!

  1. #1
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    Cond Probe problem!

    Hi guys!! a few months ago my cond probe worked very nice, but some day for some reason the probe descalibrated, so i bought a few days ago the calibration solution 53,000. The calibration were fine, on the apex module screen appears 34.8ppt, so when i put the probe in my tank the reading was 29.5 (i checked with my red sea refractometer) and the reading was 32. I thing my probe is not working well (but its weird that in the solution said almost 35ppt)... a few moments ago i shot down my vectra m1 return pump and the reading of the probe (in the tank) rose from 29.5 to 31.8 when the pump was off, if i turn on my return pump the reading low to 29.5

    look at the graphic.

    Sin título.png

  2. #2
    Frequent Contributor zombie's Avatar
    Join Date
    Dec 2013
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    Denver, CO
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    13,176
    Try moving the cond cord around so it is further from your vectra cord. If that doesn't help, the problem is stray voltage, which is sometimes helped with a grounding probe but often means that insulation is beginning to fail on the device producing the voltage.

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

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