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54
Standard programs
• If air bubbles are entrapped, remove them by heat, vacuum,
ultrasonic treatment or other suitable means.
• Clean the outside of the cuvettes/sample cells thoroughly
before inserting them in the cell compartment.
5.5 Color measurement
Proper sample preparation is extremely important for accurate
color measurement. To make sure that an exact measurement is
taken, refer to the following sample preparation guidelines:
• Always clean the glass cuvettes/sample cells immediately
after use.
• Only use optically preferred samples for measurement. Make
sure the cuvettes/sample cells are clean and show no signs
of opaqueness.
• Slowly add the liquid to the cuvette in order to prevent the
formation of air bubbles in the sample.
• Chapter 5.4, Page 53 contains further information on
preparing and taking samples.
The color measurement mode is used to determine absolute
color values in the Hazen, Gardner, CIE L*a*b* or European
Pharmacopoeia color scales.
For each cuvette type (11 mm round cuvette and 10 and
50 mm square cuvettes), an independent calibration data record
is used.
It is possible to calibrate the instrument with one, two or three
types of cuvettes/sample cells and to use these different
cuvette/sample cell types in parallel.
To use the 10 mm square cuvette and 11 mm round cuvettes,
adapter Z must be inserted into the cuvette compartment (2). For
measurements with 50 mm square cuvettes, you must remove
the adapter.
NOTICE
Before using disposable cuvettes/sample cells made of PS
(Polystyrene) or PMMA (Polymethyl methacrylate), be sure that the
cuvettes/sample cells will not be destroyed by samples, otherwise the
cell compartment can be damaged.