Campbell Scientific 034A-L WindSet - Manual (Page 5)

1
MET ONE 034A-L WINDSET
1. GENERAL
The Met One 034A-L Windset is an integrated
cup anemometer and wind vane. The
anemometer consists of three cups that sense
the wind speed. These cups rotate on a vertical
shaft that magnetically activates a sealed reed
switch. The read switch opens and closes at a
rate proportional to wind speed. The wind
direction is sensed by a vane. The vane drives a
10 k
Ω potentiometer.
2. SPECIFICATIONS
Wind Speed
Operating Range: 0 to 49 m s
-1
(0 to 110 mph)
Threshold: 0.4 m s
-1
(0.9 mph)
Accuracy:
±0.12 m s -1
(
±0.25 mph) for wind
speed < 10.1 m s
-1
(22.7 mph)
±1.1% of reading for wind
speeds > 10.1 m s
-1
(22.7 mph)
Output Signal: contact closure (reed switch)
Wind Direction
Range: 0 to 360
°, shorting to ground between
356
° to 360°
Threshold: 0.4 m s
-1
(0.9 mph)
Accuracy:
±4°
Resolution: 0.5
°
Potentiometer Specifications:
Resistance: 0 to 10 k
Ω shorting at crossover
General Specifications
Operating Temperature Range: -30
° to +70°C
Weight: 907 g (2.0 lb.)
NOTE: The black outer jacket of the cable is
Santoprene
®
rubber. This compound was
chosen for its resistance to temperature
extremes, moisture, and UV degradation.
However, this jacket will support combustion in
air. It is rated as slow burning when tested
according to U.L. 94 H.B. and will pass
FMVSS302. Local fire codes may preclude its
use inside buildings.
3. INSTALLATION
3.1 SITING
Locate wind sensors away from obstructions
(e.g. trees and building). As a general rule of
thumb there should be a horizontal distance of
at least ten times the height of the obstruction
between the windset and the obstruction. If it is
necessary to mount the sensors on the roof of a
building, the height of the sensors, above the
roof, should be at least 1.5 times the height of
the building. See Section 9 for a list of
references that discuss siting wind speed and
direction sensors.
3.2 MOUNTING
Tools Required:
• 5/64” and 1/16” allen wrenches
• compass and declination angle for the site
• small screw driver provided with datalogger
• UV resistance cable ties
• small pair of diagonal-cutting pliers
• 6 - 10” torpedo level
Mount the 019ALU crossarm to the top of the
tripod/tower. Orient the 019ALU north and
south with the 3/4 x 1 inch Nu-Rail on the north
end. Appendix A contains detailed information
on determining true north using a compass and
the magnetic declination for the site.
Remove the alignment screw at the base of the
034A-L (Figure 3-1). Insert the 034A-L into the
aluminum bushing provided with the sensor.
Align the hole in the bushing with that in the
034A-L base and replace the screw. Insert the
034A-L/bushing into the 3/4 x 1 inch Nu-Rail on
the 019ALU. Align the sensor so that the
counter weight points to true south and tighten
the set screws on the Nu-Rail. Remove the
shoulder screw to allow the vane to rotate.