Moisture tester notes during use:
1. The system is completely sealed: the reagent liquid path must be tightly connected, from the reagent bottle to the metering pump to the reaction tank, otherwise the reagent leakage will directly affect the test results. Another problem with its non-sealing is that the Karl Fischer reagent absorbs air moisture during the test, which causes a delay in the titration end point.
2, the exact problem of sampling: in the calibration of Karl-Fisher reagents need to take 10mg water, try to use 10ul sampler, which is not only accurate, fast, but also can prevent water droplets from sticking. Similarly, the use of methanol reagents, ethyl esters have similar problems, should pay attention to minimize the opening time of the reaction tank after the transfer.
3, magnetic stirring speed adjustment: in the reaction tank, because the titration reagent is added locally, and the electrode is not in one place, so the stirring speed is preferably so fast that no turbulence is formed, so that the end point can be reached as quickly as possible.
4, the titration speed should be set first fast and then slow: the timing of the drop is fast to minimize the test time, and the strain is slow when approaching the end point, which can improve the measurement accuracy.
5. The moisture analyzer should be kept away from the strong magnetic field to avoid the electronic display jumping when working, and abnormal phenomena appear. Manual moisture analyzers, because glass autoburette reagents and methanol solvents must be used, and the glass burette itself must be connected to the outside world due to the equilibrium pressure.
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