Campbell 020C, Instruction Manual, Page: 15 / 30

020C Wind Direction Sensor
7
7.3 Siting
Locate wind sensors away from obstructions such as trees and buildings. A
general rule is that a horizontal distance of at least ten times the height of the
obstruction should be between the wind set and the obstruction. If mounting
the sensor on the roof of a building is necessary, the height of the sensor above
the roof should be at least 1.5 times the height of the building. See Section
9 ,
References
(p. 10)
, for resources that discuss siting wind sensors.
7.4 Assembly and Mounting
Before installation:
•
Check to see that the vane assembly rotates freely.
•
Ensure that the vane assembly is balanced and the counterweight is
tight by holding the sensor horizontal to verify balance.
Tools required:
•
1/2-inch open-end wrench (for CM220)
•
5/64-inch and 1/16-inch Allen wrenches
•
28798 020C Mounting Bushing
•
compass and declination angle for the site
•
small screwdriver provided with datalogger
•
UV-resistant cable ties
•
small pair of diagonal-cutting pliers
•
6- to 10-inch torpedo or spirit level
•
CM220 Right-Angle Mounting Kit or 3/4 x 1-inch Nu-Rail®
Crossover Fitting (pn 1049)
1. Mount the CM200-series crossarm to the tripod or tower. Orient the
crossarm north to south with the Nu-Rail® fitting or CM220 Right Angle
Mounting Kit at the north end of the crossarm. Appendix
C , Wind
Direction Sensor Orientation
(p. C-1)
, contains detailed information on
determining true north using a compass and the magnetic declination for
the site.
2. Assemble the sensor (FIGURE 7-1 and FIGURE 7-2 ):
a. Remove the screw from the base of the sensor column.
b. Place the sensor column in the bushing such that the hole in the
bushing aligns with the hole just vacated by the alignment screw.
c. Replace the screw and tighten until snug. Do not over tighten.
3. Place the sensor and bushing in the CM220 bracket (FIGURE 7-1 ) or
Nu-Rail® fitting (FIGURE 7-2 ).