6-10 | Model 933 UV Analyzer
c. Inspect the Cell Windows (or Window/Mirror Combination – Low
Range Cell only) for scratches, chips, and cracks and discard if
damaged. If the Windows (or Window/Mirror Combination) are
not damaged, carefully clean them:
Cell Windows (and Window side of Window/Mirror Combination):
Clean with a dry Kimwipes tissue or with a small amount of 2-pro-
panol.
Window/Mirror Combination (Low Range Cell only):
Stand the Mirror vertically and apply 2-propanol (ultra pure
Isopropyl Alcohol) to its surface. Gently place a Kimwipes
®
EX-L
tissue (or an equivalent extra low-lint tissue) on the surface and
allow it to absorb the alcohol and gently pull the Kimwipes tissue
along the surface of the mirror. Dry the Mirror with filtered instru-
ment air or allow to air dry. Do not touch the Mirror surface with
your fingers, scratch or rub the Mirror, or use water on a Mirror.
To clean the Window side of the Window/Mirror Combination, see
“Cell Windows”, above.
d. Inspect the interior of the Measuring Cell for particulate and clean
it with a nonabrasive detergent and water solution, Isopropanol,
or reagent-grade acetone followed by a rinse with pharmaceutical-
grade distilled water.
Allow all components to dry thoroughly before reassembling.
7. Replace parts in the Measuring Cell:
It is critical to reassemble the Reflector Block in the exact orientation
as it was assembled at the factory.
If the Cell Windows (or Window/Mirror Combination) are found to
be scratched, cracked, or chipped, replace them during reassembly. Do
not operate the analyzer with faulty parts.
a. Standard Range
Hold the Measuring Cell vertically with the Reflector Block end
up and install (2) new o-rings (P/N 100-2009), the Window (P/N
300-0281), and the Window Holder.
Orient the Reflector Block with its “peak line” at 90° to a line
through the fittings and place it on the Measuring Cell. Ensure the
Window does not slide out of position when the Reflector Block is
placed against the Measuring Cell.
Secure the Reflector Block to the Measuring Cell with (3) M4 x 35
screws. Tighten the screws evenly.
!
CAUTION
!
CAUTION
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