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Electrode is a key component of the moisture measuring instrument, contamination of the electrode surface can directly leads to a decrease in sensitivity, some electrode long-term application in the analysis of oil samples, electrode surface oil pollution, reduction of sensitivity, the electrode on the final judgment is slow, resulting in the Karl Fischer Reagent excess, the end point of the reaction solution darker colors, at this time must be cleaning electrode. The reaction is slow and directly affects the accuracy of the measurement, even though it is not visible to the naked eye. Therefore, the use of electrodes after a period of time must be cleaned, but a considerable part of the operator did not take into account this problem.

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