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Thread: White filter in the internal overflow tube not necessary

  1. #1
    Join Date
    18.02.2009
    Location
    Kaiserslautern
    Posts
    7,710

    Default White filter in the internal overflow tube not necessary

    There is a white filter (approx. 4 mm x 5 mm in size) in the inner venting and overflow tube of the KHD.
    This filter lets air through but not water.

    The purpose of this filter is on the one hand, to reduce noise during the measurement from inside the KHD, on the other hand, it should avoid that in case of unintentional overfilling of the measuring cell, e.g. due to incorrect calibration of the pumps or incomplete emptying of the measuring cell before the next measurement, water comes out of the the venting (also overflow) outlet.

    However, there were cases in which the filter clogged, possibly by overfilling with (dirty) water, which then led to incorrect measurement results.

    Therefore, we came to the conclusion that the filter can be rather counterproductive: The minimal louder operating noise and the possibility that water comes out of the vent outlet is not considered to be problematic.

    That means:
    1. KHD will be produced from now on without this filter.
    2. If problems occur with the KHD that indicate a clogged vent tube, please remove this filter without replacement.
    You are welcome to send it to GHL for removing the filter, or you can do it by yourself.
    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.
    Kein Support oder Reklamationsabwicklung über PM! Bitte senden Sie an die Moderatoren nur PMs bei allgemeinen Problemen mit der Verwendung des Forums! Danke dass Sie uns dabei helfen, den Support effektiv zu gestalten.

  2. #2
    Join Date
    27.05.2018
    Posts
    10

    Default

    Is there an instruction on how to do this, or is it in the make?

  3. #3
    Join Date
    27.05.2015
    Posts
    2,488

    Default

    When you open the KHD housing, you will see the white filter inside the vent tube.
    Unscrew the connector that holds the vent tube in-place, remove the tube then remove the filter. Reinsert the tube to the vent connector and connect the locking nut.

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