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Thema: GHL Doser accuracy

  1. #1
    Registriert seit
    19.04.2016
    Ort
    Dubai
    Beiträge
    41

    Standard GHL Doser accuracy

    I have 2 pieces of GHL Dosers 2.0 with 4 pumps each.

    I want to use 1 doser for the KH Director and started calibrating the 3 pumps according to the manual (2 pumps at speed 3, 1 pump at speed 0)
    I calibrate by using a precision weight scale (0.01g) and rodi water.
    For each pump I do 3 calibrations and enter the volume/minute if the 3 calibration results are the same.

    The pump at speed 0 seems to be correct.
    But the 2 pumps at speed 3 have a bit of fluctuations when set to pump 80ml. There are differences of 1 to 2 ml.
    Is this according to the accuracy of these pumps? Or should the pumping volume be exact 80ml?

    I cannot improve much to the set up.
    Suction hose length is 25cm. Pressure hose length is 15cm.

  2. #2
    Registriert seit
    27.05.2015
    Beiträge
    1.576

    Standard

    What is the firmware version of both 2.0 dosers?

  3. #3
    Registriert seit
    19.04.2016
    Ort
    Dubai
    Beiträge
    41

    Standard

    The current version is 33.
    I am just wondering what the expected accuracy would be for a speed 3 and volume of 80ml.

    If you can confirm that, I can further see how to improve the set up.

  4. #4
    Registriert seit
    27.05.2015
    Beiträge
    1.576

    Standard

    A tolerance of +/- 0.5ml is acceptable.

    Perhaps the parts (head, tubing, rollers) are due for replacement due to age. That will certainly cause accuracy issues if the parts are worn down.

  5. #5
    Registriert seit
    19.04.2016
    Ort
    Dubai
    Beiträge
    41

    Standard

    Thank you Vinny.
    I will order some motors and tubing as these pumps already have some years of running hours.

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