Hanna alk checked in dkh and ppm

Discussion in 'Reef Chemistry' started by scuzy, Jun 23, 2017.

  1. scuzy

    scuzy Supporting Member

    So I just tested both dkh shows 8.9 and ppm is 155 which calculated to 8.6 now which one is the correct one? Hah hard to tell since the +- 0.3


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    Last edited: Jun 23, 2017
  2. rygh

    rygh Supporting Member

    I doubt it calculated dkh/ppm wrong.
    So simply not very accurate or precise. (Which are different)
     
  3. scuzy

    scuzy Supporting Member

    I have both Hanna checker one is dkh and one is ppm model both giving me wrong readings. I checked with my redsea it reads 8.4


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  4. rygh

    rygh Supporting Member

    Of course, one has to ask: Why do you think the redsea is correct?
    :)
    Yes, the Red Sea Pro test kit proclaims high accuracy. (< 0.14)
    But reagents get old. And it is hard to read it perfectly.
    Was that the Pro version anyway?
    At +/-0.2, the Hanna 8.6 is in range.

    Not that I am really defending Hanna. I stopped using mine also. But mostly because API is way easier,
    and +/-1.0 is close enough for me.
     
  5. scuzy

    scuzy Supporting Member

    Haha yes I'll just go by estimate and not it swing by too much.


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  6. Vhuang168

    Vhuang168 Supporting Member

    Best way is to get the Hanna test standard. Test both and find out which is closer. Then keep testing till you get an average Delta. Apply that Delta when recording.


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  7. Flagg37

    Flagg37 Officer at large

    I do something similar to this. I use the fauna marin reference solution and test my test kit against it. So when I test the reference solution and it comes up with 9.0 dKh and the reference solution shows that it's really 8.5 then I know that my test kit is consistently .5 above what it really is. Another thing to compound this issue is that I've noticed that each time I open a new bottle of reagent I get subtly different readings from the last batch.
     
  8. Vhuang168

    Vhuang168 Supporting Member


    Yes. You have to recalibrate each time you change reagents. The thing that sucks is BRS doesn't carry the Fauna Marin reference solution anymore. :(

    Have to find another source or go direct.


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