Chapter 6: Shutdown and Maintenance 213
8 Re-install the nozzle and deflection plates.
See Changing the Nozzle on page 205 for details.
9 Adjust the plates so there is a gap of approximately 0.28 in. (0.7 cm)
between them at the top.
Cleaning the Optical Filters
Optical filters should be inspected occasionally and cleaned as necessary. The
frequency will depend on how often the filters are handled.
1 Wrap a triangular section of the lens paper around the cotton end of a
cotton swab. Moisten and seal the end with a few drops of alcohol.
2 Holding the cotton swab in a horizontal position, gently rub any spots on
the filter surface and wipe clean.
3 Allow the solvent to evaporate and check the filter surface for streaks.
4 Inspect a ¼-inch–diameter section in the center of the filter for scratches.
Filters are coated with different dielectrics that can get scratched. If you see
scratches, replace the filter.
5 Insert the cleaned filter into the octagon or trigon.
Make sure the filters are pushed all the way in.
When cleaning or replacing a filter, handle with care to avoid scratching the
surface and to prevent the filter from falling out of the holder. Use cotton
swabs, optical lens paper, and spectral-grade methanol or absolute ethanol
in a dropper bottle (do not use acetone) to clean the optical filters.
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