Long Lead Lengths; Sensor Maintenance - Campbell 05103 User Manual

'WS_ms
PulseCount(WS_ms,P_LL,1,1,0.098,0)
'WindDir
ExDelSE(WindDir,1,1,1,mV2500,20000,0.142,0)
If WindDir>=360 Or WindDir<0
'Call Data Tables and Store Data
CallTable
NextScan
EndProg

7.4.5 Long Lead Lengths

CAUTION
8.

Sensor Maintenance

NOTE
Then WindDir=0
Hour
When sensor lead length exceeds 100 feet, the settling time allowed for the
measurement of the vane should be increased to 20 milliseconds. Theoretical
calculations indicate that 20 milliseconds is conservative.
For the CR200(X) datalogger, enter 20 ms for the Delay parameter of the
ExDelaySE() instruction. For other CRBasic dataloggers, increase the Settling
Time parameter of the BRHalf() instruction to 20 milliseconds (20,000
microseconds). For Edlog dataloggers, use Instruction 4—Excite, Delay (P4)
and enter a 2 in the Delay parameter. Edlog dataloggers cannot use a delay when
the 60 Hz rejection option is used.
Do not use long
environments.
Every month do a visual/audio inspection of the anemometer at low wind speeds.
Verify that the propeller and wind vane bearing 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 R.M. Young's Propeller Torque Disc (pn #18310) as described in
the R.M. Young manual (see www.youngusa.com/products/7/).
The potentiometer has a life expectancy of fifty million revolutions. As it
becomes worn, the element can produce noisy signals or become non-linear.
Replace the potentiometer when the noise or non-linearity becomes unacceptable.
The condition of the vertical shaft (vane) bearings can be checked with R.M.
Young's Vane Torque Gauge (pn #18331).
Often Campbell Scientific recommends factory replacement of the
bearings and potentiometer. Refer to the
document for the procedure of acquiring a Returned Materials
Authorization (RMA). Mechanically-adept users may choose to
replace the bearings or potentiometer themselves. Instructions for
replacing the bearings and potentiometer are given in R.M. Young's
manuals (www.youngusa.com/products/7/).
lead lengths in electrically
Assistance
User Manual
noisy
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