the viewer IR window and the eyepiece lens
may occur in cold weather and frequent clean-
ing may be necessary.
c. Dusty or Sandy Areas.
Operation in dusty or sandy areas can
cause pitting and scratching of opti-
cal elements and damage to external
mechanical components. Observe the
precautions given in (1) through (4)
(1) Avoid pointing the viewer IR window
into the wind unless necessary for operation.
(2) Cover as much of the viewer as pos-
sible to prevent damage to external surfaces.
(3) Keep the carrying bag closed and/or
the protective cap installed on the IR window
when the equipment is not in use.
(4) The IR window and eyepiece lens may
require frequent cleaning. To remove dust and
sediment from the lenses, use a lens brush.
Finish cleaning the IR window and eyepiece
lens with a clean lens tissue.
d. Rainy or Humid Conditions.
To prevent corrosion and deteriora-
tion, thoroughly dry all surfaces of the