Maintenance & Troubleshooting
Hardware Installation and Maintenance Manual B
–11
3. Proceed to the instructions called “To clean the glass mirror” on
page B-11 or “To replace the stainless steel mirror” on page
B-12.
Tocleantheglassmirror
1. For the 28 m and 8 m cells, look inside the sample cell at the top
mirror using a flashlight to ensure that there is no contamination on
the top mirror. For 0.8 m and 0.1 m cells, proceed to the step 3.
2. Remove dust and other large particles of debris from the lower
mirror using a bulb blower or dry compressed air/nitrogen.
3. Put on clean acetone-impenetrable gloves.
4. Double-fold a clean sheet of lens cleaning cloth and clamp near and
along the fold with the hemostats or fingers to form a “brush.”
5. Place a few drops of isopropyl alcohol onto the mirror and rotate the
mirror to spread the liquid evenly across the mirror surface.
6. With gentle, uniform pressure, wipe the mirror from one edge to the
other with the cleaning cloth only once and only in one direction to
remove the contamination. Discard the cloth.
7. Repeat with a clean sheet of lens cleaning cloth to remove the streak
left by the first wipe. Repeat, if necessary, until there is no visible
contamination on the mirror.
8. Replace the O-ring adding a very thin layer of grease and ensuring
it is properly seated.
Always handle the optical assembly by the edge of the mount.
Never touch the coated surfaces of the mirror.
SpectraSensors does not recommend cleaning the top mirror.
Refer to “Service Contact” on page B-27 if the top mirror is
visibly contaminated.
Pressurized gas duster products are not recommended as the
propellant may deposit liquid droplets onto the optic surface.
Never rub an optical surface, especially with dry tissues, as this
can mar or scratch the coated surface.
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