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Trace moisture analyzer use matters needing attention
Trace moisture analyzer uses Karl-Fischer Coulomb titration detection principle, the application of microcomputer automatic control technology, the use of large-screen LCD display, full Chinese menu prompt operation, a wealth of calculations, print experimental results, is oil, chemicals, electricity The ideal instrument for testing moisture content in medicine, pesticides, and research institutes.
At present, China is at a critical stage in the development of petroleum. Trace moisture analyzer is an important instrument for the determination of petroleum. First of all, when measuring, press the start button to inject the oil into the reagent as quickly as possible. When the oil is injected into the electrolytic cell, the needle should be inserted into the electrolyte. Secondly, before petroleum is measured, it is necessary to ensure that the petroleum vessels used are dry. There is a special oil vessel for petroleum. Before measuring, the tip of the sample gas must be wiped with filter paper from the end to the front to avoid the needle attachment. Water is carried into the reagent or attached to the injection pad, causing inaccuracies in the determination of oil results. Finally, to ensure consistency in the amount of oil each time, the better the consistency, the better the data reproducibility.
Notes on the actual use of trace moisture meter:
(I). Precautions for using the environment
1. The humidity of the use environment should be kept within a reasonable range, and the electrolyte must be protected from moisture. After the electrolyte is wet, the blank current will increase, and it is not easy to reach the equilibrium point. The test result is not stable, and the data is high and low.
2. The temperature of the use environment should be within a reasonable range to avoid low temperature or high temperature. If the temperature is too high (above 35 degrees), the conductivity of the electrolyte will increase, which will result in high test data. Low temperatures (below 0 degrees) will reduce the conductivity of the electrolyte and the test data will be low.
3. Avoid direct sunlight, direct sunlight on the reagent will make the reagent photosynthesis reaction, the reagent automatically iodine. Trace amounts of iodine will cause the data to be low.
(B). Precautions for injection operations
1. The typical measurement range of the cassette coulometric method (coagulation method) is 10 μg to 10 mg. In order to obtain accurate measurement results, it is necessary to appropriately control the sample injection amount according to the sample water content.
2. Ensure that the sampler you are using is dry before injecting. There is a dedicated sampler for each sample. If there is more than one sample sharing a sampler,
3. Always wipe the needle part of the sample gas from the tip to the tip with filter paper before injection to prevent the moisture attached to the needle from being drawn into the reagent or attached to the sample pad. Inaccurate test results.
4. When injecting, press the start button and try to inject the sample into the reagent as fast as possible.
5. When the sample is injected into the electrolytic cell, the needle of the liquid sampler is inserted into the electrolyte. The liquid, solid, gas sampler and sample should not come into contact with the inner wall of the titration cell and the electrode.
6. To ensure the consistency of each injection volume. The better the consistency, the better the data reproducibility.
(C). Precautions when reagents are unstable
1. It is not easy for the reagent to reach the end point due to high air humidity, frequent sample preparation, or solid samples. This is the most common problem during the experiment. For the air humidity, it is not easy to reach the end point when the solid sample is used. The electrolysis cell can be shaken to absorb the water in the internal space of the electrolysis cell, which can reach the end point quickly.
2. When the sample is frequently used or the reagent is near failure, the reagent is not easy to reach the end point. You can take appropriate amount of pure water to adjust the sensitivity of the reagent to make it reach the endpoint faster.
3. When the reagent is used for a long time, excessive consumption of iodine in the reagent is close to the end point when the reagent is near failure. In this case, the new reagent should be replaced as soon as possible. If there is no new reagent and a test sample is urgently required, the appropriate amount of pure water may be temporarily injected to adjust the sensitivity of the reagent and cause it to reach the end point. The results measured at this time can only be used as a reference.