Specifications

TEAM Climate Monitoring Protocol 3.1
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5.6.2 Licor LI200X Solar Radiation sensor
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 Electrical tape
 Permanent marker
 Plastic cable ties
 Wire cutter/stripper
 Allen wrench
 Solar Radiation sensors (LI200X)
It is recommended to install two pyranometers (solar radiation sensors) for redundancy and to account
for seasonal changes in solar path. If the pyranometer is not at the very top of the base tower, the base
tower could shade it during some periods of the year depending on the geographical location of the
field station. For example, in stations located north of the equator the sun path moves southwards
between the summer solstice (June 21) and the winter solstice (December 21) and then back
northwards until the next summer solstice (June 21). If the pyranometer is facing south then the tower
may cast a shade on it between the summer solstice and the fall equinox (September 23) and then
again between the spring equinox (March 21) and the summer solstice (see
http://astro.unl.edu/naap/motion3/animations/sunmotions.swf for a nice simulation of this). A similar
situation can arise for tropical locations south of the equator. To avoid this problem it is better to have
two pyranometers, one facing north and one facing south and then the appropriate reading can be
post-processed depending on the time of the year (not in the original data!). Even if the pyranometer
is not shaded (e.g. at the top of a structure), it is always better to have two in case one gets dirty, or
malfunctions.
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Attach a CM225 stand to the end of the cross arm (CM200 Series)
using the U-bolts provided so there is a leveled surface for the sensor (Figure 16). The height
of the sensor is not as critical as the orientation (either facing north or south), but should be
mounted near the top of the tower where it is less shaded. Attach the leveling base (LI2003S)
to the CM225 stand and mount the sensor on it by tightening the small screw on the side with
the included Allen wrench.
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Use the bubble level and adjustment screws on the base to level the
sensor accurately.