Assembly and mounting

Materials required:

• 5/64-inch hex key wrench

• 1/2-inch open end wrench

• Compass and declination angle for the site (see Determining true north and sensor orientation)

• Small screwdriver provided with data logger

• UV resistant cable ties

• 6-inch to 10-inch torpedo level

• Unthreaded aluminum pipe, 1-inch IPS, 12-inch length (shipped with the sensor)

• 1-inch-by-1-inch Nu-Rail crossover fitting

• Wind monitor body

• Propeller

• Orientation ring

• Ferrite choke Passive electronic components that help suppress radio frequency interference (RFI). (shipped with sensor)

The following procedure is for assembling the sensor and mounting it to a crossarm.

1. Remove the plastic nut on the propeller shaft.

2. Place the propeller on the shaft and secure it to its shaft by using a wrench to tighten the plastic nut.

   

   Wind monitor mounted to a crossarm by using 1- x 1-in.
   Nu-Rail crossover fitting

3. Mount a crossarm to a tripod or tower.

4. If a pyranometer is also being mounted on the crossarm, orient the crossarm north-south with the Nu-Rail on the end farthest from the equator. Otherwise, the crossarm may be oriented north-south, east-west, or any other angle desired. Determining true north and sensor orientation contains detailed information on determining true north by using a compass and the magnetic declination for the site.

5. Secure the 12-inch aluminum pipe to the Nu-Rail fitting.

6. Place the orientation ring, followed by the wind monitor, on the aluminum pipe.

7. Orient the junction box to the south, and tighten the band clamps on the orientation ring and aluminum pipe. Final sensor orientation is done after the data logger has been programmed to measure wind direction, as described in Determining true north and sensor orientation.

8. Use the torpedo level A small level tool shaped like a torpedo and used to check if a surface is perfectly flat. to ensure the wind monitor is level.

9. Insert the cable through the ferrite choke center hole, loop the cable over the top of the ferrite choke, and reinsert the cable through the ferrite choke center hole (see the following figure).

   CAUTION:

   Must install the ferrite choke on the cable near the sensor to meet EMC compliance.

   

   Ferrite choke installed on cable

10. Route the sensor cable along the underside of the crossarm to the tripod or tower and to the instrument enclosure.

11. Secure the cable to the crossarm and tripod or tower by using cable ties.

The wind monitor can also use a CM221 Right-Angle Mounting Kit or CM216 Sensor Mounting Kit; see the following figures. The CM221 uses U-bolts to secure the sensor to a crossarm. The CM216 mounts the wind monitor on top of a CM106B, CM110, CM115, or CM120 tripod. The CM216 extends 10 cm (4 in) above the mast of the tripod.