MAINTENANCE
48
OP MA6-8/BA6-8 E Rev05 07-06 Maintenance
2
2.6.1. Cleaning Materials
• Latex laboratory gloves:
Protective gloves should always be used, when-
ever solvents are applied. Moreover, use of
gloves will prevent direct touching of optical com
-
ponents, which would result in new contamina-
tion.
• Dry cleaning:
To blow off dust, use only filtered, dry nitrogen
gas, applied through an anti-static nozzle. If nitro
-
gen is not available, use extremely clean com-
pressed air (CDA).
• Flushing:
For final flushing after wet removal of deposits,
apply always DI-water. It removes also smears
produced by solvents. Remaining water droplets
can be removed without residue by a nitrogen
blow.
• Detergent solution:
A mild soap, e.g. dish washing liquid in a 1% di-
lution with DI-water, is likewise appropriate. Per-
fumed, alkaline or colored dish washing products
are to be avoided.
• Solvent:
Isopropyl alcohol (IPA) is acceptable as a sol-
vent.Never use acetone to clean the optical sur-
faces. They could be dissolved and destroyed.
For obstinate contaminations (e.g. resin) Petro-
leum Ether (30/40) can be used.
Note:
This special light benzine can be supplied by
chemical suppliers as Carl Roth (www.carl-
roth.de)
Attend the much higher flammability compared to
ordinary gasoline!
• Cloth:
Avoid wiping with cloth, because any wiping can
cause fine scratches in optical coatings.
If unavoidable for removing of persistent contam-
inations use only dust- and lint-free tissues, such
as lens cleaning tissues or equivalent. Soak the
tissue with solvent and apply only by wiping with
a gentle, figure eight motion or by dipping off gen
-
tly.
For removal of small local contamination spots as
well as for wiping very small lenses the lens tis
-
sue should be twisted around a swab.
Do not use any plastic cloths or plastic swab
stems for cleaning. Plastics could be dissolved
by alcohol and produce a smear coating on the
optical components.
2.6.2. Application Technique
Preparation for cleaning of optical components:
• Provide a clean laboratory table
• Have nitrogen blower with antistatic nozzle
• Prepare wash bottles with DI-water, detergent
solution and solvent, and empty bowls for collect
-
ing the liquids.
• Prepare submersion bowls filled with DI-water,
detergent solution and solvent.
• Supply gentle, clean cloths as described above.
• Prepare a box with a lid for safe collection of sol-
vent soaked cloths (to prevent from self ignition).
2.6.3. Cleaning Procedure
Remove the optical component, which has to be
cleaned, from the machine and note the orientation
and exact location for later reinstallation.
Wet cleaning can be done - as appropriate - by rins-
ing of the liquid over the optical surface or by sub-
mersion of the optical component into the clean
liquid.
Fingerprints or droplets of oil should be removed - as
soon as they appear - in soap water.
See the flow diagram below for detailed cleaning
procedure recommendation. In case of doubt about
adequate clening call SUSS service in advance.
Note:
Solvent consuption should be kept to a reasonable
minimum for environmental and safety reasons.
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