Handling the standard solu‐
tion
The standard solution 1000 NTU
must be lightly shaken before use
for calibration.
Standard solution 10 NTU must
be transferred to the cuvette from
the supply bottle before it is used
for the first time. The filling for the
10 NTU cuvette is then usable for
3 months.
Do not use the standard solution
once the use-by-date has expired.
Purpose of indexing
The standard solution cuvettes
have minimal manufacturing toler‐
ances. This results from the man‐
ufacturing process and is unavoid‐
able.
In order to minimise the effects of
these manufacturing tolerances
on the calibration process, you
must index and mark the position
on the cuvette with the lowest tur‐
bidity value (lowest NTU value).
You can mark the index points
with the help of the marking rings
supplied. These marking rings are
included with the calibration set
packaging. The marking ring must
first be placed around the plastic
cover of the respective cuvette.
Operation
57
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