Theoil moisture testerunder UHV power can help many power workers conduct various power tests more conveniently.

The precautions for oil moisture testers are as follows:

(1) System wide closure issue. The connection of the Karl Fischer reagent liquid circuit from the reagent bottle to the metering pump and then to the reaction tank must be tightened, otherwise reagent leakage will directly affect the detection results. Another unresolved issue is the delay in titration completion due to the absorption of Karl Fischer reagent during testing.

(2) Accuracy of sampling. The calibration of Karl Fischer reagent requires 10 mg of water and the use of 10 μ l samplers as much as possible, which is not only accurate and fast, but also can prevent water droplet adhesion. Similarly, there are similar issues with the use of methanol reagents and ethyl esters. After disassembly, attention should be paid to shortening the opening time of the reaction tank as much as possible.

(3) Adjust the magnetic stirring speed. In the reaction tank, since the titration reagent is locally added and not in the same position as the electrode, the stirring speed can be fast enough to avoid turbulence and quickly reach the endpoint.

(4) The titration speed should be set quickly and then slowly. Titration should be carried out as soon as possible to shorten the testing time as much as possible, while the strain is slow near the endpoint to improve measurement accuracy.

(5) After the end of the experiment on that day, the Karl Fischer reagent in the system must be emptied and cleaned with methanol. The system cannot be cleaned with water because it is not easily volatile, resulting in false calibration of the Karl Fischer reagent in the next experiment.

(6) The hygrometer should be kept away from strong magnetic fields to avoid electronic display jumping and abnormal phenomena. Manual hygrometer, as the glass automatic burette must be used to measure Karl Fischer reagent and methanol solvent, and due to equilibrium pressure, the glass burette itself must be connected to the outside.

In addition to the above aspects, the following two points should be noted when using a trace moisture analyzer:

1. The system should be as closed as possible. A manual hygrometer requires the installation of a U-shaped tube filled with desiccant on the straw and glass burette to reduce the interference of air humidity on the test results. In environments with relative humidity greater than 70%, drainage tests should be as unstable as possible.

2. When adjusting the titration speed of the burette, the value is adjusted to 1 drop per second. If the titration speed is too fast, there will be a significant delay error when reaching the endpoint, while if the titration speed is too slow, it will prolong the testing process and easily lead to a delay in reaching the endpoint.