BUCHI NIRFlex N-500 - Manual (Page 62)

6 Operation
62 NIRFlex N-500 Operation Manual, Version F
! CAUTION
Minor or medium burns by hot surfaces
Do not touch the cell chambers •
NOTE
The software does not prevent measurements in case of incorrect temperatures. The operator is
responsible, that the current temperature corresponds with the set temperature. A reproducible
temperature of the samples is crucial when carrying out measurements in transmission mode. The
heat-up time of the sample material must be sufficient to reach the measurement cell temperature.
Working with different types of cuvettes
For most of the applications running with the NIRFlex Liquids, the use of 2 mm cuvettes is recom-
mended. However, the cell is designed to use 1, 5 and 10 mm cuvettes as well. If doing so, the
spacers, which fix the cuvettes in the measurement position, must be changed. A set of different
spacers is included in the scope of delivery.
For quadratic cuvettes :
No spacers are required.
For rectangular cuvettes:
All rectangular cuvette types must be installed
in pairs with a matching spacer!
The cuvette must be aligned to the turning •
hub (inner circle of the cell).
A matching spacer must be aligned to the
•
outer circle of the cell.
Handling of different cuvette types
NOTE
Quartz glass cuvettes are recommended when working with the NIRFlex Liquids. Most plastic
cuvettes show a significantly higher light absorption rate which can reduce the determination
performance. This also has direct influence onto calibration and reproducibility. Make sure that the
radiated surfaces of the cuvettes are placed perpendicular to the beam of light.