Accessories
40 Rev. E2 04/2011 Marathon MR
Figure 26: Fixed Mounting Bracket
8.3 Air Purge Collar
The Air Purge Collar accessory is used to keep dust, moisture, airborne particles, and vapors away
from the lens. It can be installed before or after the bracket. It must be screwed in fully. Air flows into
the 1/8” NPT fitting and out the front aperture. Air flow should be a maximum of (0.5 to 1.5 liters/sec
or 0.13 to 0.4 gallon/sec). Clean (filtered) or “instrument” air is recommended to avoid contaminants
from settling on the lens. Do not use chilled air below 10°C (50°F).
Figure 27:Air Purge Collar
8.4 Polarizing Filter End Cup
The Polarizing Filter can be screwed into the viewing port to provide eye protection when sighting on
bright, high temperature targets. The filter does not affect measured energy. It is solely for viewing
comfort. Rotate the outer portion of the filter until you achieve the desired visual attenuation.
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