Maintenance of trace moisture meter

Trace moisture analyzer safety protection

Karl Fischer's reagent consists mainly of a solution of iodine, sulfur dioxide, pyridine and methanol. Among them, sulfur dioxide and pyridine are highly volatile and harmful to the human body. They should be handled under good ventilation conditions. Especially when changing reagents, pay attention to exhaust air to prevent harmful gases from inhaling the body. Wear protective glasses and latex gloves to avoid spilling harmful agents on your eyes and hands. In the event that reagents are spilled, your eyes and hands should be immediately flushed with running water. In severe cases, they should be taken to hospital for treatment.

However, the actual situation is that some operators lack knowledge of the hazards of the reagents. Without any protective measures, the reagents are randomly poured into and poured out, and the house smells are completely ignored. The problem of self-protection awareness needs to be strengthened.

Electrode contamination and maintenance of trace moisture analyzer

The electrode is a key component of the moisture analyzer. Contamination of the electrode surface can directly lead to reduced sensitivity. Some electrodes are used for long-term analysis of oil samples. After the electrode surface is contaminated with oil, the sensitivity is reduced, making the electrode insensitive to the endpoints. Excessive Karl Fischer reagent, the color of the solution is darker at the end of the reaction, the electrode must be cleaned at this time. Although the contaminants on the electrode were invisible to the naked eye, a slow response was observed and directly affected the measurement accuracy. Therefore, the electrode must be cleaned after a period of use, but a considerable number of operators did not consider this problem.

When the sensitivity is reduced, the electrode is seriously polluted. The paper can be wiped with a piece of acetone to wipe the electrode, but it must be careful, but also must wait until the acetone has evaporated completely. Or immerse the electrode in dilute nitric acid solution for 24 hours, then remove, rinse with water, and filter paper. It can also be cleaned with potassium dichromate solution for 1 minute to activate the electrode. In special circumstances, such as the sample waiting to be analyzed, the electrode cleaning time is not allowed, then an emergency solution can be used to solve the electrode contamination event. Wipe the two ends of the electrode gently with very fine sandpaper. After the filter paper is wiped, it can be effective.

If the instrument is not used for a period of time, the Karl Fischer reagents in the pump tube and in the fluid path should be completely drained to avoid clogging of the tube due to crystallization due to volatilization of the reagents; the Karl Fischer reagent in the same reaction flask should also be After finishing, the electrode wipes. In the detection of the instrument, it can often be found that the measurement of the operator's sample is finished, the power is turned off, and the accuracy of the maintenance and the maintenance of the trace moisture analyzer is closely related to the measurement.