Accessories
58 Rev. D7 Jul 2017 Marathon MM
9.4 Air Purge Collar
The Air Purge Collar accessory is used to keep dust, moisture, airborne particles, and vapors away from
the optical head’s 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 - 1.5
liters/sec (1 - 3 cfm). 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).
The air purge collar can only be used either with the sensor alone or with the Air/Water Cooled Housing.
The Air Purge Collar is rotatable in steps of 120°.
The Air Purge Collar is available in Aluminum (XXXMMACAP) or stainless steel (XXXMMACAPS).
Figure 36: Air Purge Collar
9.5 Sight Tube
Use a protection tube in temperature measurement environments where reflected energy is a problem.
Stainless Steel Protection Tube up to 800°C (1472°F) (XXXTST12)
Ceramic (Alumina) Protection Tube up to 1500°C (2732°F) (XXXTSTC12)
When using a customer supplied protection tube, use caution in specifying the inside
diameter and length. Your sensing head determines what diameter/length
combinations are possible without impeding the optical field of view!
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