CNR2 Net Radiometer
FIGURE 3-1. Mounting According to Hemisphere
Mount the CNR2 at a height of at least 1.5 meters above the surface to avoid
the shading effects of the instruments on the soil and to promote spatial
averaging of the measurement. If the instrument is H meters above the surface,
99% of the input of the lower sensors comes from a circular area with a radius
of 10 H. Shadows or surface disturbances with radius <0.1 H will affect the
measurement by less than 1%.
The 26120 mounting bracket kit is used to attach the CNR2 directly to a
vertical pole or to a CM202, CM204, or CM206 crossarm.
A 26127 mounting rod is required to attach the CNR2 to a pole
or crossarm via the 26120 mounting kit. The 26127 mounting
rod began shipping with the CNR2 in February 2010. This
mounting rod will need to be purchased if the CNR2 was shipped
prior to February 2010.
NOTE
Mount the sensor as follows:
1.
Screw the 26127 mounting rod into the base of the CNR2.
2.
Attach the 26120 mounting bracket to the pole or crossarm, using the kit’s
U-bolts (see Figure 3-2).
3.
Insert the 26127 mounting rod into the mounting block of the 26120
mounting bracket kit. Make sure the sensor points in the direction of the
arrows that appear after the word “SENSOR” on top of the bracket (see
Figure 3-2). Perform a coarse leveling of the sensor using the bubble level
on the top of the CNR2, and tighten the four screws on top of the
mounting bracket to properly secure the mounting rod so that it does not
rotate.
Do not attempt to rotate the instrument using the sensor heads, or
you may damage the sensor; use the mounting rod only.
NOTE
4.
Perform the fine leveling using the two spring-loaded leveling screws: one
on the front and the other on the back of the bracket.
3
Summary of Contents for CNR2
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