LI-COR LI7200RS, Instruction Manual

Page: 34 / 226

Section 2. Initial Setup
Important: Do not insert the intake into the anemometer path, because sig-
nificant flow disturbance to all three wind components may occur, severely affect-
ing flux data quality. Or worse, the intake could completely block the
transducers.
The insulated intake tube can be cut to 0.5 meters or shorter by cutting the stain-
less steel tube and insulation sleeve. If you use the 1 meter intake tube, we recom-
mend that you secure the intake tube on the tower before tightening it to the
sensor head. This will help prevent excessive stress on the joint where the intake
tube is attached to the sensor head.
Figure 2-7. Optional mounting with cus-
tomized intake tube and user-supplied
inlet. For very rainy environments, tilt
the analyzer even more and bend the
intake tube to prevent water from being
drawn in.
The insulated intake tube can be bent to
accommodate most mounting arrange-
ments. Don’t bend the tube until it kinks,
however, as flow will be restricted.
We recommend mounting the LI-
7200/RS sensor head at a 10° angle, so
that in the unlikely event that rain is
drawn into the sample cell it does not
remain for long periods of time. The
sample cell is waterproof and will not be
damaged by water present in the cell for
short periods of time, but it may lead to
corrosion or the accumulation of salt,
dust, and pollen over long periods of
time. In addition, water trapped in the
cell will affect H
2
O and CO
2
con-
centrations, flux measurements, and time
delays.
2-14 LI-7200RS Enclosed CO₂/H₂O Analyzer