Gpr/Gps Air Purge Collar - RayTek Thermalert GP Series Operator's Manual

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B.5.5

GPR/GPS Air Purge Collar

The Air Purge Collar accessory is used to keep dust, moisture, airborne parti-
cles, and vapors away from the lens. It can be installed before or after the
mounting bracket. It must be screwed in fully. Air flows into the 1/8" NPT
brass fitting and out the front aperture. Air flow should be a maximum of
0.5-1.5 l/s (1-3 cfm). Clean or "instrument" air is recommended to avoid
contaminants from settling on the lens.
63
φ
(2.5)
22
(.875)
1.5 inch
20 UN-2B
φ 38
(1.5)
Figure B-9: GPR/GPS Air Purge Collar Accessory
Thermalert GP Series Operator's Manual
www.calcert.com
15
10 20
5 25
0 30
1/8"
27 NPT
1.5 inch
20 UN-2A
25
(1)
mm (inches)
75
(3)
41
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