The part of the liquid channel of the trace moisture analyzer must be fastened, from the reagent bottle to the metering pump to the reaction tank, otherwise the leakage of the reagent will directly affect the test results. Another problem is that the reagents absorb air and water during the test, which can delay the titration endpoint. Sampling accuracy. When calibrating reagents, try to use 10 mg of water and a 10 μl sampler, which is accurate, fast, and prevents water droplets from sticking.
Similarly, the use of methanol reagent and ethyl ester also has similar problems. After disassembly, attention should be paid to shorten the opening time of the reaction tank as much as possible. In the reaction tank, since the titration reagent is added locally and is not in the same position as the electrode, the stirring speed is good, no turbulence is formed, and the end point can be reached quickly; the titration speed should be set first, and then slowly. Titration should be performed as soon as possible, with the shortest possible test time, but with a slow decline near the end point, which can improve dosing.
At the end of the day's testing, the system must be emptied of reagents and rinsed with methanol. The system cannot be cleaned with water as it is not volatile, which will make calibration of Karl Fischer reagent impractical in the next test. The trace moisture analyzer should be kept away from strong magnetic fields to avoid electronic beating and abnormal phenomena. Manual trace moisture analyzer, because the glass automatic titrator must be used to measure Karl Fischer reagent and methanol solvent, and the glass titrator itself must be connected to the outside world due to the relationship of equilibrium pressure.
The measuring range of the trace moisture analyzer is 0ug ~ 200mg. In order to get accurate results, it is necessary to control the amount of the sample according to the water content of the sample. Liquid sample: The sample to be tested is extracted by the sampler and injected into the anode chamber of the electrolytic cell through the injection port. Before injection, the needle must be wiped with a test strip. When the sample is injected into the electrolytic cell, the needle tip of the liquid sampler should be inserted into the electrolyte reagent and should not touch the inner wall of the electrolytic cell and the electrodes.