Campbell Scientific 034A-L WindSet - Manual (Page 10)

MET ONE 034A-L WINDSET
6
07: Real Time (P77)
1:
0110 Day,Hour/Minute
08: Wind Vector (P69)
1:
1 Reps
2: 0 Samples per Sub-Interval
3: 00 S,
θu, & σ(θu) Polar**
4: 1* Wind Speed [ WndS_m_s ]
5: 2* Wind Direction [ WndD_deg ]
-Input Locations-
1 WndS_m_s
2 WndD_deg
* Proper entries will vary with program and datalogger
channel and input location assignments.
** Average wind speed, average unit vector wind direction,
standard deviation of unit vector wind direction
6. SENSOR MAINTENANCE
1 Month
• Do a visual/audio inspection of the
anemometer at low wind speeds. Verify
that the cup assembly and wind vane rotate
freely. Inspect the sensor for physical
damage. Verify cups and vane are tight.
6 Months
• Replace anemometer bearings if operating
under harsh conditions
1 Year
• Replace anemometer bearings. Contact
Campbell Scientific for a Return Materials
Authorization (RMA) number at (801) 753-
2342.
2 Years
• Replace the wind vane potentiometer and
bearings. Contact Campbell Scientific for a
Return Materials Authorization (RMA)
number at (801) 753-2342.
7. LONG LEAD LENGTHS
When lead lengths greater than 200 feet are
required to measure the 034A-L, use the DC
Half Bridge instruction, Instruction 4, with a 20
millisecond delay to measure wind direction.
The delay increases the settling time before the
measurement is made.
With a CR10(X), use a 2500 mV excitation and
the 2500 mV measurement range. With a 21X,
use a 5000 mV excitation and the 5000 mV
measurement range.
CAUTION: The 60 Hz rejection option can
not be used with the DC Half Bridge
instruction, when the delay is not zero. Do
not used long lead lengths in electrically
noisy environments.
TABLE 7-1. Multiplier and Offset for Wind
Direction when using Lead Lengths Greater
than 200 Feet
Units Datalogger
type
Instruction
number
Multiplier
Offset
degrees CR10(X) 4 0.288
0
degrees 21X 4 0.144
0