LI-COR LI7200RS, Instruction Manual

Page: 32 / 226

Section 2. Initial Setup
Mounting the Sensor Head and Intake Tube
The LI-7200/RS sensor head should be mounted to a tripod or tower using the
mounting kit (part number 7900-340) or a ¾ inch IPS NuRail® swivel mount. The
head should be tilted at a 10 to 15° angle toward the inlet. If the intake tube is
longer than 15 cm, it should be attached to a secure element so that the analyzer is
not bearing its full weight.
Figure 2-4. Mount the sensor head to a tripod or tower using the mounting kit (part num-
ber 7900-340). Tilt the head 10° to ensure that water flows out of the intake tube. The
heated intake tube is similar.
Position the intake to minimize vertical and horizontal separation between the
intake and the center of the sonic anemometer, while also minimizing distortion of
the airflow. If the installation is high above the top of the plant canopy (1.5-2.0 m
or higher), mount the intake under the sonic path to minimize the horizontal
sensor separation and wind flow disturbance, as shown in
Figure 2-5 on the facing
page. If the installation is closer to the plant canopy top, mount the intake along-
side the sonic path to minimize the vertical sensor separation, as shown in
Figure
2-6 on the facing page. In this case, avoid bringing the intake too close to the sonic
path to minimize wind flow disturbance.
2-12 LI-7200RS Enclosed CO₂/H₂O Analyzer