Why does the needle have to go into the reagent?

For samples such as transformer /insulating oils, which are viscous and contain low levels of moisture, we recommend inserting the syringe needle below the surface of the anode reagent before injecting the sample. This ensures that the sample is given enough time to disperse in the reagent and for the detector electrode to see any signal change. Please remember that no titration takes place until after the detector electrode has seen a signal change caused by the presence of water.

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