42 Thermalert GP Series Operator’s Manual
IMPORTANT
When using the Right Angle Mirror, adjust the emissivity set-
tings downward by 5%. For example, for an object with an
emissivity of 0.95 use 0.9; for an object with 0.8 use 0.76; for
0.65 use 0.62. This correction accounts for energy losses in the
mirror.
φ 45
(1.8)
1/8"
27 NPT
66
(2.65)
1.5 inch
20 UN-2B
25
(1)
mm (inches)
Figure B-10: GPR/GPS Right Angle Mirror Accessory
B.5.6 GPR/GPS Right Angle Mirror
The Right Angle Mirror accessory is used to obtain a perpendicular view of
the object. It is often used when space is limited or when you need to avoid
excessive radiation to the sensor. It must be installed after the bracket or
after the Air Purge Collar (if used) and screwed in fully. In dusty or contami-
nated environments, air purging is required to keep the first surface mirror
clean. If used in conjunction with the Air Purge Collar, both the Right Angle
Mirror and the Air Purge Collar must be air purged.
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