The electrode is a key component of the moisture analyzer, and the sensitivity can be directly reduced if the electrode surface is contaminated during use. Especially for moisture analyzers that have been used for oil sample analysis for a long time, the surface of the electrode is more likely to be contaminated by grease, the sensitivity is lowered, and the judgment of the end point becomes dull, resulting in excessive Karl-Fischer reagent and dark color of the solution at the end reaction. Therefore, the electrode must be cleaned frequently to ensure the life of the moisture analyzer.
When the electrode is heavily contaminated, use an acetone-coated paper to carefully wipe the electrode and wait until the acetone has completely evaporated before continuing to use it. The electrode can also be taken out after being immersed in a dilute nitric acid solution for 24 hours, rinsed with water and wiped clean with filter paper before continuing to use. In addition to the above two methods, it can also be washed with potassium dichromate solution for 1 minute to activate. electrode.
Proper maintenance can greatly delay the service life of the moisture analyzer, and also ensure the accuracy of the test results. Therefore, users should pay attention to the electrode maintenance points of the Karl Fischer moisture analyzer during use.
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