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Explanation: I don't know if this is your Probezug but this I've translated sample train a couple of times as Probezug an context like the one shown below.
[PDF] Source Test Procedure ST-25 FLUORIDE, INTEGRATED SAMPLE (Adopted ...
Dateiformat: PDF/Adobe Acrobat - HTML-Version
... record the final meter volume. Point the probe upward and purge the
sample train with ambient air. Rinse the probe and connecting ... www.baaqmd.gov/publications/manuals/mop/vol4/st25.pdf