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Thread: Neptune PH probe vs Seneye PH monitor

  1. #1
    Regular Vistor
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    Neptune PH probe vs Seneye PH monitor

    So I have a Seneye Reef (https://www.seneye.com/devices/seneye-reef ) and 2016 Apex. I continually see a .2 difference in the readings between both (Seneye always higher). I've recalibrated the Apex probe several times along with changing the sensor chip on the Seneye.


    1. Anyone have the same issues?
    2. Is this normal?
    3. Which one do I trust?


    Thought & comment greatly appreciated!


    Thanks,

    Jim
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  2. #2
    Apex User zombie's Avatar
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    Trust the apex (make sure when you calibrate you wait at least 5 mins in each solution). The Seneye uses a lower accuracy pH probe and the calibration procedure isn't as reliable.

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

  3. #3
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    If you trust the apex then trim the seneye back .2 and they will match.

    http://answers.seneye.com/en/Seneye_...st_temp_PH_NH3

  4. #4
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    That the problem. I don't know which one to trust now.?

  5. #5
    Apex User zombie's Avatar
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    Again trust the apex. If you want a quick check to know which one is correct, place the probes in 7 and 10 calibration solution. If the apex doesn't read 7.0 and 10.0, it needs to be calibrated before you trim the Seneye. If it does read right, trim the Seneye by 0.2

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

  6. #6
    Regular Vistor
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    Thank you, I will check the probe as you recommend and ajust as necessary.

    Thank you

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