When exposed to sunlight, the 107 should be housed in a six-plate solar radiation shield. Six-
plate shields offered by Campbell Scientific are models 41303-5A, 41303-5B, or RAD06.
The white colour of these shields reflects solar radiation, and the louvred construction allows air
to pass freely through, thereby keeping the probe at or near ambient temperature. The RAD06
uses a double-louvred design that offers improved sensor protection from insect intrusion and
driving rain and snow. In addition, the RAD06 shield has lower self-heating in bright sunlight
combined with higher temperatures (> 24 °C (75 °F)) and low wind speeds (< 2 m/s (4.5 mph)),
giving a better measurement.
The 41303-5A and RAD06 attach to a crossarm, mast, or user-supplied pipe with a 2.5 to 5.3cm
(1.0 to 2.1in outer diameter. The 41303-5B attaches to a CM500-series pole or a user-supplied
pole with a 5.1cm (2.4in outer diameter.
Tools required for installing a radiation shield to a tripod or tower include:
l 1/2-inch open end wrench
l UV resistant cable ties
l adjustable wrench with a minimum 1-1/2 inch jaw size
FIGURE 7-1. Installing a 107 and 41303-5A Radiation Shield on a CM200-Series Crossarm
107 Temperature Probe8
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