Aqualytic AL400T-WL, Instruction Manual, Page: 9 / 32

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AL400T-WL_2a 07/2011
1.4 Important Notes
1.4.1 Guidelines for turbidity measurements
Vials and caps should be cleaned thoroughly after each test to avoid interferences. Minor a)
residuals can cause errors.
The outside of the vial must be clean and dry, before starting the test. Wipe the vials with b)
a smooth cloth to remove fingerprints or waterdrops.
The vials must be positioned in the sample chamber with the mark on the vial aligned c)
with the mark on the instrument.
Always perform the test with securely capped vials. d)
Bubbles on the inside of the vial lead to errors e) . See chapter 2.3.3.1 Removing bubbles
(Degassing).
Avoid spillage of water in the sample chamber. If water should leak into the instrument, f)
it can destroy electronic components and cause corrosion.
Large temperature differences between the instrument and the environment can lead g)
to errors – e.g. due to the formation of condensation in the area of the lens or on the
vial. For best results, perform tests with sample temperatures between 20°C (68°F) and
25°C (77°F).
To avoid errors caused by stray light do not use the instrument in bright sunlight. h)
Use the instrument in a clean, dust-free environment on a table that is free from vibra- i)
tion / agitation.
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