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Thread: P4 conductivity probe read less every day..

  1. #11
    Join Date
    29.12.2016
    Posts
    17

    Default Same issue with fluctuating salinity

    i have a similar issue with the conductivity probe, jumping around by a significant amount. Yes, it may be the effects of micro bubbles, but if that is the case, why is my old P3 probe which is inches away not having the same issue, I got a replacement temperature probe because the old one was reading significantly higher than the P3 probe and a lab grade thermometer but i still have the same issue with the salinity probe. I've calibrated it a number of times now.(if you are wondering why i have both P3 and P4 in same tank it is because the P3 is connected to my old doser and Ive been waiting months now for a doser 2.1)

  2. #12
    Join Date
    21.02.2017
    Posts
    24

    Default

    Print me one!

  3. #13
    Join Date
    15.02.2017
    Posts
    25

    Default

    IMG_3734.jpg

    I have change the position and have upload it to the aquarium directly as you can see at the image, but after 3 hours it is still on the same values (1.0218)

    more ideas?

  4. #14
    Join Date
    29.12.2016
    Posts
    17

    Default Micro bubbles

    My old P3 conductivity, connected to my P3, stays constant but the new P4 probe readings fluctuate , but if I take the new P4 one out and put it back in the water it is ok. Therefore I think it is, as others have said, due to micro-bubbles . I wonder if new sensors tend to attract these more than old ones. Old and new probes were close together in my sump.
    Ps don't shake the probe when you take it out as I just did, catching the corner of the sump and smashing the glass probe! A very expensive shake!!
    I guess this gives me a chance to plug the old P3 probe into the new P4 and see if it fluctuates whilst I order a new conductivity probe.

  5. #15
    Join Date
    13.03.2012
    Posts
    42

    Default

    My probe is the Same. Everyday less reading. Take it out en put it in the water and it's oké

    Verstuurd vanaf mijn SM-G900F met Tapatalk

  6. #16
    Join Date
    21.02.2017
    Posts
    24

    Default

    Just refreshing this issue. It's still very real and apparent. Any solutions to this besides buying a $100 cell with hopes that it will solve it?Screenshot (388).jpg

  7. #17
    Join Date
    14.10.2016
    Posts
    31

    Default

    I'm not sure if this helps or not but I have the conductivity probe on a freshwater tank and I am not experiencing this issue.

  8. #18
    Join Date
    03.02.2017
    Posts
    42

    Default

    I have the same problem with P4. The probe read less every day. I don't have micro bubbles and I have calibrated it three times. It starts 1025 and two days later 1024 I need to recalibrate it. Any solution?
    Last edited by decena; 26.04.2017 at 15:35. Reason: Updated measure

  9. #19
    Join Date
    10.03.2017
    Posts
    27

    Default

    But is the salinity value on your profilux is correct?
    To me from other values that do not correspond to density
    Example refractometer 1.026 ---- probe 1.054

    because ?
    Last edited by totorus; 26.04.2017 at 15:16.

  10. #20
    Join Date
    03.02.2017
    Posts
    42

    Default

    Yes the value on my profilux is correct 1025. But it read less every day :

    Sunday: 1025
    Monday:1024.5
    Tuesday: 1024
    Wednesday: 1023.5

    I Need to recalibrate it every two days.... no bubbles, no dirty.. do I need to remplace it? I received the P4 five days ago...
    I hope GHL can solve it. It's a general problem
    Last edited by decena; 26.04.2017 at 15:37. Reason: Mistake

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