VOLTCRAFT NTU-600 Mode D'emploi page 25

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Always handle the glass bottle by touching only the cap or its top side (threaded part). Use
the supplied cloth to wipe the bottle surface clean.
Before a glass bottle is placed into the sample holder of the instrument, it must be dry
outside, completely free of any glass imperfection.
After a glass bottle is used, rinse it inside and outside with clean water in a thorough way.
Allow it to air dry, then store it in the supplied bottle holder with a cap. This can prevent dirt
and dust entering inside.
Standard solution and calibration
3
The standard solution set includes three glass bottles in which the standard solution is
contained (named 0 NTU, 100 NTU and 800 NTU). The standard solution (2) is exclusively
used in calibration for achieving accurate measurements.
Before taking a standard solution bottle to perform a calibration, fully mix the standard
solution in the bottle, so that a best measurement can be made.
Gently hold the bottle upside down (by gripping the bottle cap), then inverse it to the stand-up
position. Repeat this several times to fully mix the standard solution.
Do not shake the bottle to prevent air bubbles present, because air bubbles can affect the
turbidity readings.
If there is some material suspended in the standard solution, wait for a few minutes until the
suspended material settles.
The standard solution has a service life. Use the standard solution before the expiration date
marked on the standard solution bottle.
Sample preparation
4
It is very important to select a representative sample for constant results.
Gently mix the water before taking the sample.
Handle the sample carefully to avoid spillage of the sample into the instrument.
Analyze the sample immediately after collection because the turbidity can change with time.
To avoid dilution of the sample, rinse the testing glass bottle and measuring cup (3) with an
amount of the sample and discard the liquid, then refill the testing bottle with the sample for
measurement.
Any air bubbles present in the sample can cause high turbidity readings. Remove air
bubbles before taking measurements.
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