E-mail: michael@shboqu.com   |   Expert in Water Quality Measurement and Water Treatment Project

The main points of the use of water quality detector

by:BOQU     2022-09-15

1. The system needs to be shut down. Need to tighten Karl— The connection of the reagent liquid circuit, 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 its problem. Unsealed is the fact that the Karl Fischer reagent absorbs moisture from the air during the test, resulting in a delay in the endpoint of the titration.

2. Accurate sampling problem. When calibrating Karl— When using the body reagent, you need to ingest 10mg of water, try to use a 10ul sampler, which is not only accurate and fast but also prevents water droplets from sticking. Similarly, with methanol reagents, ethyl esters have similar problems and care should be taken to minimize the open time of the reaction tank after transfer.

3. Magnetic stirring speed adjustment. In the reaction cell, since the titration reagent is applied locally rather than in one place of the electrode, the stirring speed should be fast and no turbulence will be formed, so the endpoint can be reached. as soon as possible.

4. The water quality detector should be kept away from strong magnetic fields to prevent the electronic display from jumping and abnormal phenomena during operation. Manual moisture analyzer, because the glass automatic burette needs to be used for metering Karl-Fischer reagent and methanol solvent. Due to the equilibrium pressure, the glass burette itself needs to be connected to the outside.

5. When adjusting the titration speed of the burette, it should be adjusted to 1 drop/second. A rapid acceleration of the titration will create a large delay error in reaching the endpoint, and a titration that is too slow will prolong the test process, resulting in a delay in reaching the endpoint.

6. The titration speed should be set fast and then slow. The titration speed is fast, the test time is short, and the strain near the endpoint is slow, which improves the measurement accuracy.

7. The system is as close as possible. Manual moisture analyzers require U-tubes filled with desiccant on pipettes and glass burettes. To reduce the interference of air humidity on the test results, in an environment with air relative humidity greater than 70%, moisture testing should be arranged as much as possible.

8. After the test of the day, be sure to empty the Karl Fischer reagent in the system, then clean it with methanol, never clean the system with water, because it is not volatile, so the Karl Fischer reagent will be produced in the next test, which will lead to inaccurate calibration. correct.

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