Maintenance
Marathon MR Rev. E2 04/2011 53
10.3 Cleaning the Lens
Keep the lens clean at all times. Any foreign matter on the window will affect 1-color measurement
accuracy and may affect two-color accuracy. However, care should be taken when cleaning the lens.
To clean the window, do the following:
1. Lightly blow off loose particles with “canned” air (used for cleaning computer equipment) or
a small squeeze bellows (used for cleaning camera lenses).
2. Gently brush off any remaining particles with a soft camel hair brush or a soft lens tissue
(available from camera supply stores).
3. Clean remaining “dirt” using a cotton swab or soft lens tissue dampened in distilled water. Do
not scratch the surface.
For finger prints or other grease, use any of the following:
Denatured alcohol
Ethanol
Apply one of the above to the lens. Wipe gently with a soft, clean cloth until you see colors on the
surface, then allow to air dry. Do not wipe the surface dry, this may scratch the surface.
If silicones (used in hand creams) get on the window, gently wipe the surface with Hexane. Allow to
air dry.
10.4 Changing the Window
Sometimes extremely harsh environments can cause damage to the window.
A replacement window (XXX2CPW) is available from the manufacturer.
To replace the sensor’s window, complete the following:
1. With a very small flat-bladed screw driver (e.g., a jeweler’s screwdriver), pry out the
rubberized Buna-N 70 durometer O-ring. The O-ring is set in a groove in front of the window.
2. Turn the sensor face down (window pointing down), and the window should fall out.
3. Turn the sensor face up and insert the new window. (Make sure both sides of the window are
clean.)
4. Replace the O-ring.
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