52 Thermalert GP Series Operator’s Manual
B.6.4 GPM Air Purge Jacket
The Air Purge Jacket 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 flow should be a maxi-
mum of (0.5 - 1.5 liters/sec (1 - 3 cfm). Clean or “instrument” air is recom-
mended to avoid contaminants from settling on the lens.
To install the air purge jacket (refer to Figure B-22), remove the sensor (1) and
cable by disconnecting the cable from the electronics box. Then open the Air
Purge Jacket (3, 4) and screw the white plastic fitting (2) onto the sensor up
to the end of the threads. (Do not overtighten.) Slip the cable (6) through the
backside (4) of the jacket. Close the Air Purge Jacket (3, 4) and reconnect the
wires to the electronics box.
47
(1.85)
φ21
(φ.83)
M12x1
Hose with inner diameter of 3 mm (.12 inches),
outside diameter 5 mm (.2 inches)
Figure B-21: GPM Air Purge Jacket
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