BUCHI NIRFlex N-500 - Manual (Page 66)

7 Maintenance and repairs
66 NIRFlex N-500 Operation Manual, Version F
In order to avoid contamination by sample material between the measurements, clean the surfaces in
direct contact with the sample after each measurement.
NOTE
Switch off the NIRFlex N-500 and all directly connected eletronic devices i.e. monitors before •
cleaning the housing.
Avoid scratches on optical surfaces as they can influence a measurement!
•
For coated optical surfaces, use abrasion-resistant precision cloths such as Kimwipes from •
Kimberly-Clark. Primary cleaning can be done with disinfectant wipes on alcohol basis.
Avoid fingerprints on any optical surface!
•
7 .2 .1 Optical surfaces and probes
All optical surfaces must be handled with care i.e. must not be scrached, cleaned with unproper
cleaning medium. Do not apply excessive force to any part of the device or its accessories!
If the connectors for the measuring cell on the instrument are dirty, clean them with a soft cloth mois-
tened with alcohol.
In order to avoid contamination by sample material between the measurements, clean the surfaces
in direct contact with the sample after each measurement. For this purpose, use abrasion-resistant
precision cloths such as Kimwipes from Kimberly-Clark. Loose dust can be removed by blowing with
clean and oil-free compressed air. If substances still adhere, you may additionally rinse the surfaces
with acetone or alcohol.
Due to the limited resistance of the adhesive between metal and quartz glass, the fiber optic probe
must not be in prolonged direct contact with organic solvents nor acids and alkaline solutions. Take it
out of the liquid directly after completing the scans.
To prevent contamination of the white standard reference make sure that it is always applied to a
clean measuring cell.
NOTICE
Risk of damage at the coating of the sample plate
Do not cleat the sample plate in a dishwasher •
Clean the sample plate with Ethanol and a soft, lint-free tissue •
7 .2 .2 Cleaning of the External Reference
For dependable reference measurements the External Reference and Transflectance adapter must be
clean and damage free.
In case the External Reference is strongly contaminated despite the neces-
sary precautions, rinse it with pure acetone. Make sure to remove all cleaning residue.