How to maintain the MA-2A automatic Karl Fischer moisture analyzer electrode
The electrode is a key component of the moisture analyzer. The contamination of the electrode surface can directly lead to the decrease of sensitivity. Some electrodes are used for the analysis of oily samples for a long time. After the surface of the electrode is contaminated by oil, the sensitivity is lowered, which makes the judgment of the electrode to the end point dull. Karl Fischer reagent excess, the solution color is darker at the end of the reaction, the electrode must be cleaned at this time. Although the contaminants on the electrodes are not visible to the naked eye, slow response can be observed, which directly affects the measurement accuracy. Therefore, the electrode must be cleaned after a period of use, but a considerable number of operators have not considered this problem.
The specific treatment method of the trace moisture analyzer; the two platinum claws of the measuring electrode are burned to dark red with an alcohol lamp, and then naturally cooled and reused, or the two platinum claws of the measuring electrode are laid flat, and the attached matter is gently scraped off with a blade. (Note that the two platinum claws should be placed in parallel in the electrolytic cell bottle. The two platinum claws should not be touched together to cause a short circuit. The short circuit will cause the instrument to not count. The open electrode of the measuring electrode will cause the instrument to count indefinitely, and the reagent will not reach the end point for a long time until the reagent After iodine failure
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