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Thread: KHD measure with ALK/dKH reference solution

  1. #1
    Join Date
    01.11.2020
    Posts
    13

    Default KHD measure with ALK/dKH reference solution

    Dear support team,

    I did two measures with the GHL ALK/dKH reference solution (7.5 °dKH) and results were 7.9 and 8.0. The tolerance of the solutions is +/- 0.2 °dKH. Probe and doser pump were calibrated before the measures.

    Could you please tell to me the reason of this values? Is the KHD working bad?

    Thanks in advance.

    Regards,
    Oscar Sánchez.

  2. #2
    Join Date
    27.05.2015
    Posts
    2,409

    Default

    Hello Oscar,

    The correct tolerance when using the KHD and Reference solution is +/- 0.4° dkH (0.2 from KHD and 0.2 from Reference solution).
    Given your results, you are within the tolerance range.

    If you would like to get the KHD result a bit closer to the 7.5 mark, check again your tube lengths and calibrate your pump heads. When calibrating pump heads, you can use a digital scale to get the most precise measurement; 1g = 1mL

    You can also verify your water sample tube volume by temporarily disconnecting the tube going into the KHD and manually filling both ends of the tube. Empty this tube into a digital scale or measuring cup and type-in the amount into the tube volume field in the KHD settings page.
    No support or warranty issues over PM!
    Please send PMs to the moderators only if you have general problems with using the forum! Thanks for helping us to keep the support efficient.

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  3. #3
    Join Date
    01.11.2020
    Posts
    13

    Default

    Thanks Vinny for the tips! I will apply it to get a more accurated result!

  4. #4
    Join Date
    08.08.2022
    Posts
    2

    Default

    Vinny,

    When you do this, should you remove the filter?
    And do you have to add the 11.9 mm length of tubing in the pump and filter volume ?

  5. #5
    Join Date
    27.05.2015
    Posts
    2,409

    Default

    You don't have to remove the filter. Leave it installed.

    Yes, all parts of the water sample tubing must be taken into account before you enter the total length.
    No support or warranty issues over PM!
    Please send PMs to the moderators only if you have general problems with using the forum! Thanks for helping us to keep the support efficient.

    Creating a support ticket
    For support or warranty issues, create a support ticket by clicking here.

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