5 long lead lengths, Sensor maintenance, Long lead lengths – Campbell Scientific 03002, 03101, and 03301 R. M. Young Wind Sentry Sensors User Manual
Page 23

R.M. Young Wind Sentry
14: Set Active Storage Area (P80)^15464
1: 1
Final
Storage
Area
1
2: 101
Array
ID
15: Real Time (P77)^6687
1: 1220
Year,Day,Hour/Minute
(midnight
=
2400)
16: Wind Vector (P69)^28601
1: 1
Reps
2: 0
Samples
per
Sub-Interval
3: 0
S, theta(1), sigma(theta(1)) with polar sensor
4: 2
Wind Speed/East Loc [ WS_ms ]
5: 3
Wind Direction/North Loc [ WindDir ]
7.4.5 Long Lead Lengths
When sensor lead length exceeds 100 feet, the settling time allowed for the
measurement of the vane should be increased to 20 milliseconds.
For dataloggers programmed with Edlog (and the CR200(X)), the EX-DEL-SE
(P4) measurement instruction should be used. Enter a 2 in the P4 “Delay”
parameter for a 20 millisecond delay.
For dataloggers programmed with CRBasic, increase the Settling Time
parameter of the BRHalf() instruction to 20 milliseconds (20,000
microseconds).
The 60 Hz rejection option can not be used with the DC
Half Bridge instruction, when the delay is not zero. Do not
use long lead lengths in electrically noisy environments.
CAUTION
8. Sensor Maintenance
Every 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.
Replace the anemometer bearings when they become noisy, or the wind speed
threshold increases above an acceptable level. The condition of the bearings
can be checked with a paper clip as described in the R.M. Young manual.
The potentiometer has a life expectancy of fifty million revolutions. As it
becomes worn, the element can produce noisy signals or become nonlinear.
Replace the potentiometer when the noise or nonlinearity becomes
unacceptable.
Contact Campbell Scientific for a Return Materials Authorization (RMA)
number at (435) 227-9000. A “Statement of Product Cleanliness and
Decontamination” form also needs to be filled out.
17