What precautions should be taken when using a residual chlorine colorimeter?

What precautions should be taken when using a residual chlorine colorimeter? Chlorine colorimeter for rapid detection of residual chlorine in water
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Before using it, there are some things that you need to know.
The following editor summarizes the relevant points for everyone, let's increase your knowledge together
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Measurement Notes: Pay attention to the applicability of the measurement method, the interference of the analytical standard and the matrix to the method
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Tablets are for chemical analysis only and should be stored properly
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In order to avoid measurement errors in the process of colorimetric measurement, special attention should be paid to the following points: 1.
After each measurement and analysis, the cuvette, cuvette cap and stirring rod should be cleaned at the bottom.
Even a very small amount of reagent residue will cause measurement errors.
, please clean the cuvette with the brush provided
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2.
Make sure that the outer wall of the cuvette is dry and clean before analysis.
Fingerprints or water droplets will cause measurement errors.
If there are fingerprints or smudges on the cuvette
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 　　3.
When using the same cuvette, perform "zero point correction" and then "measure" because there are slight differences in accuracy
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 　　4.
When performing zero calibration and measurement, make sure that the white triangle mark on the cuvette is aligned with the white triangle mark on the sample chamber on the colorimeter
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 　　5.
Screw on the cap of the cuvette when performing zero calibration and measurement
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 　　6.
Air bubbles on the inner wall of the cuvette will cause measurement errors.
Screw on the lid and shake to remove air bubbles to avoid measurement errors
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 　　7.
Ensure that no water penetrates into the sample chamber of the colorimeter.
The infiltration of water into the sample chamber of the colorimeter will damage the electrical system of the colorimeter, such as causing corrosion
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 　　8.
Dirty lenses (LED and photosensitive head) in the sample chamber will cause measurement errors.
Check—clean if necessary—the distance from the incident light surface to the sample chamber should be constant.
For cleaning, use a dampened cotton cloth or cotton
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9.
When adding the tablets, directly add the tablets from the tin foil to the cuvette, and avoid touching the tablets with hands
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10.
If the temperature difference between the sample chamber and the measurement environment is too large, it will cause measurement errors - such as the increase in the density of the lens or the cuvette
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 　　The above is the relevant introduction about the use of the residual chlorine colorimeter.
I believe that everyone has a corresponding understanding of this after reading, and everyone can use it as a reference.
I hope it will be helpful to you
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