Results 1 to 9 of 9

Thread: Calibrating using scales

  1. #1
    Join Date
    12.04.2020
    Posts
    35

    Default Calibrating using scales

    Hi guys,

    When using high precision scales to calibrate the 2.1 doser, what weight equals what volume of water?

    For saltwater at 1.025, I think 100g = 97.5ml?
    Freshwater must be 100g = 100ml?
    And the reagent - what does 100ml weigh?

    Bonus question - when re-calibrating the reagent pump, do you need to de-prime the head before disconnecting the tube?

    Thanks,

    Alex.

  2. #2
    Join Date
    26.01.2016
    Location
    Jena
    Posts
    206

    Default

    god question. :-) i wanne do the calibration also bei mg and not anymore bei ml.

  3. #3
    Join Date
    04.09.2019
    Posts
    14

    Default

    Hi.
    I don´t think so much level of accuracy would be necessary, for example the temperature of the tubes can fluctuate the amount of water and reagent. In summer they are longer. Well i think so.

  4. #4
    Join Date
    27.05.2015
    Posts
    2,488

    Default

    The weight difference won't matter much as long as you tare first with the weight of the measurement cup.
    Tare, calibrate and enter amount dispensed into the flow rate box.

  5. #5
    Join Date
    26.01.2016
    Location
    Jena
    Posts
    206

    Default

    hello, i test the reagent in a laboratory. it is nearly the same like water. 100ml =99.8g :-)

  6. #6
    Join Date
    10.05.2020
    Location
    Berlin
    Posts
    9

    Default

    There are a lot of things that impacts.
    Density, Specific gravity, hight difference, tube diamater, Position of the peristaltic rolls, temperature, back pressure, transfer speed
    But why to overthinking?
    We didn't whant to use this pumps as Medical device. I know what I speak about ��

  7. #7
    Join Date
    26.01.2016
    Location
    Jena
    Posts
    206

    Default

    on the KHD it is importend, if it is 3,0 or 3,4 ml/min.

  8. #8
    Join Date
    12.04.2020
    Posts
    35

    Default

    OK, thanks everyone.

    My other questions was when re-calibrating the reagent pump, do you need to de-prime the head before disconnecting the tube?

  9. #9
    Join Date
    27.05.2015
    Posts
    2,488

    Default

    The only head and tubes that should remain primed is the reagent head with reagent fluid.

    All others should be emptied before reconnecting to the KHD.

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •