PRODUCT MANUAL

Wind Monitor Series

05103, 05108, 05108-45, and 05305

Revision: 06/2023
Copyright © 2023
Campbell Scientific, Inc.
Table of contents
1. Introduction 1

2. Precautions 1

3. Initial inspection 2

4. QuickStart 2

5. Overview 5

6. Specifications 6

7. Installation 8
7.1 Wiring 8
7.2 Programming 9
7.2.1 Wind speed 9
7.2.2 Wind direction 10
7.2.3 WindVector processing instruction 11
7.3 Siting 11
7.4 Assembly and mounting 11

8. Sensor maintenance 14

9. Troubleshooting 15
9.1 Wind direction 15
9.2 Wind speed 16

10. References 16

Appendix A. Importing Short Cut code into CRBasic Editor 17

Appendix B. Example program 18

Appendix C. Wind direction sensor orientation 20

C.1 Determining true north and sensor orientation 20

Appendix D. Wind direction measurement theory 23

Table of Contents - i
1. Introduction
Wind monitors measure horizontal wind speed and direction. The different models are designed
for different applications (Table 1-1 [p. 1]). The wind monitors are manufactured by R. M. Young.

Table 1-1: R. M. Young wind monitors models

Model Description
05103 Standard wind monitor
05108 Heavy-duty wind monitor that greatly extends service life
05108-45 Heavy-duty wind monitor for alpine applications
05305 High-performance wind monitor for air quality applications

NOTE:
This manual provides information only for CRBasic data loggers. For retired Edlog data logger
support, see an older manual at www.campbellsci.com/old-manuals .

2. Precautions
l READ AND UNDERSTAND the Safety section at the back of this manual.
l The wind monitor is a precision instrument. Please handle it with care.
l Do not use cable lengths greater than 30 m (9 ft) in electrically noisy environments.
l The black outer jacket of the cable is Santoprene® rubber. This compound was chosen for
its resistance to temperature extremes, moisture, and ultraviolet (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.
l Wire color and functions of sensors purchased through Campbell Scientific may not
correspond with the wire colors and functions given in the manufacturer’s manual. To
ensure proper function, follow the wiring provided in Short Cut or in the Campbell Scientific
manual.

Wind Monitor Series 1

 l Wind monitors purchased directly from R. M. Young may not have the 1 MΩ resistor used
to short the readings in the dead band to ground.

3. Initial inspection
l Upon receipt of the wind monitor, inspect the packaging and contents for damage. File
damage claims with the shipping company. Immediately check package contents against
the shipping documentation. Contact Campbell Scientific about any discrepancies.
l The model number and cable length are printed on a label at the connection end of the
cable. Check this information against the shipping documents to ensure the expected
product and cable length are received.

The wind monitor is shipped in a padded box containing the sensor body, propeller, orientation
ring, and a bag containing:
(1) 1/16 inch hex key wrench from manufacturer (used for bearing replacement)
(1) Bearing gap gauge (spacer) from manufacturer (used for bearing replacement)
(1) Calibration sheet
(1) Ferrite choke from manufacturer
An unthreaded aluminum pipe is also shipped with the sensor. Information about attaching the
propeller and using the orientation ring is provided in Assembly and mounting (p. 11).

4. QuickStart
A video that describes data logger programming using Short Cut is available at:
www.campbellsci.com/videos/cr1000x-datalogger-getting-started-program-part-3 . Short Cut
is an easy way to program your data logger to measure this sensor and assign data logger wiring
terminals. Short Cut is available as a download on www.campbellsci.com . It is included in
installations of LoggerNet, RTDAQ, or PC400.
The following procedure also describes programming with Short Cut.

1. Open Short Cut and create a new program.

2. Double-click the data logger model.

Wind Monitor Series 2

3. In the Available Sensors and Devices box, type 05103, 05106, or 05305 AQ or locate the
sensor in the Sensors > Meteorological > Wind Speed & Direction folder. Double-click
05103 Wind Speed & Direction Sensor, 05108 Wind Speed & Direction Sensor, 05108-45
Wind Speed & Direction Sensor, or 05305-AQ Wind Speed & Direction Sensor. The wind
speed defaults to meters/second. This can be changed by clicking the Wind Speed box and
selecting one of the other options.

4. Click on the Wiring tab to see how the sensor is to be wired to the data logger. Click OK
after wiring the sensor.

5. Repeat steps three and four for other sensors. Click Next.

Wind Monitor Series 3

6. In Output Setup, enter the scan rate, Data Output Storage Intervals, and meaningful table
names.

7. Select the measurement and its associated output options.

8. Click Finish and save the program. Send the program to the data logger if the data logger
is connected to the computer.
9. If the sensor is connected to the data logger, check the output of the sensor in the data
display in LoggerNet, RTDAQ, or PC400 to make sure it is making reasonable
measurements.

Wind Monitor Series 4

5. Overview
Wind speed is measured by using a helicoid-shaped, four-blade propeller. Rotation of the
propeller produces an AC sine wave signal with frequency proportional to wind speed.
Vane position is transmitted by a 10 kΩ potentiometer. With a precision excitation voltage
applied, the output voltage is proportional to wind direction.
The R. M. Young Instruction Manual includes additional information on the operating principles,
installation, and maintenance of the sensor.
The wind monitors are manufactured by R. M. Young and cabled by Campbell Scientific for use
with our data loggers. Cable lengths for the wind monitors are specified when the sensors are
ordered. Table 5-1 (p. 5) gives the recommended cable length for mounting the sensor at the top
of the tripod/tower by using a CM200-series crossarm.

Table 5-1: Recommended cable lengths

CM106B CM110 CM115 CM120 UT10 UT20 UT30
4.2 m (14 ft) 4.2 m (14 ft) 5.8 m (19 ft) 7.3 m (24 ft) 4.2 m (14 ft) 7.3 m (24 ft) 11.3 m (37 ft)

NOTE:
Maximum cable length is 304.8 m (1000 ft).

CAUTION:
Do not use cable lengths greater than 30 m (98 ft) in electrically noisy environments.

Features:
l Rugged enough for harsh environments
l Constructed with thermoplastic material that resists corrosion from sea-air environments
and atmospheric pollutants
l Ideal for wind profile studies
l Compatible with the LLAC4 4-channel Low Level AC Conversion Module, which increases
the number of anemometers one data logger can measure
l Compatible with Campbell Scientific CRBasic data loggers: CR6, CR1000X, CR800 series,
CR350 series, CR300 series, CR3000, and CR1000

Wind Monitor Series 5

6. Specifications
Table 6-1 (p. 6), Table 6-2 (p. 7), and Table 6-3 (p. 8) provide the wind speed, wind direction, and
physical specifications, respectively.

Table 6-1: Wind speed specifications

05108-45
05108 05305
05103 Heavy Duty
Heavy Duty Wind Monitor-
Wind Monitor Wind Monitor-
Wind Monitor AQ
Alpine
0 to 50 m/s
Range 0 to 100 m/s (0 to 224 mph)
(0 to 112 mph)
±0.2 m/s
Accuracy ±0.3 m/s (±0.6 mph) or 1% of reading (±0.4 mph) or
1% of reading
Starting threshold 1.0 m/s (2.2 mph) 0.4 m/s (0.9 mph)
Distance constant
2.7 m (8.9 ft) 2.1 m (6.9 ft)
(63% recovery)
AC voltage (3
AC voltage (3
pulses per
pulses per AC voltage (3 pulses per revolution);
revolution);
Output revolution); 1800 1800 rpm (90 Hz) = 14.9 m/s
1800 rpm (90 Hz)
rpm (90 Hz) = 8.8 (33.3 mph)
= 9.2 m/s
m/s (19.7 mph)
(20.6 mph)
(0.0980 m/s) /
(scan rate in (0.1024 m/s) /
(0.1666 m/s) / (scan rate in seconds)
seconds) or (scan rate in sec.)
Resolution or (0.3726 mph) /
(0.2192 mph) / or (0.2290 mph) /
(scan rate in seconds)
(scan rate in (scan rate in sec.)
seconds)

Wind Monitor Series 6

Table 6-2: Wind direction specifications
05108-45
05108 05305
05103 Heavy Duty
Heavy Duty Wind Monitor-
Wind Monitor Wind Monitor-
Wind Monitor AQ
Alpine
Range 0° to 360° mechanical, 355° electrical (5° open)
Accuracy ±3°
Starting threshold 1.1 m/s (2.4 mph) 1.0 m/s (2.0 mph) 0.5 m/s (1.0 mph)
Distance constant
1.3 m (4.3 ft) 1.2 m (3.9 ft)
(50% recovery)
Damping ratio 0.3 0.25 0.45
Damped natural
7.4 m (24.3 ft) 4.9 m (16.1 ft)
wavelength
Undamped
natural 7.2 m (23.6 ft) 4.4 m (14.4 ft)
wavelength
analog DC voltage from potentiometer—resistance 10 kΩ; linearity 0.25%;
Output
life expectancy 50 million revolutions
Power switched excitation voltage supplied by data logger

Wind Monitor Series 7

Table 6-3: Physical specifications
05108-45
05108 05305
05103 Heavy Duty
Heavy Duty Wind Monitor-
Wind Monitor Wind Monitor-
Wind Monitor AQ
Alpine
–50 to +50 °C, -50 to +50 °C,
Operating
assuming –50 to +60 °C, assuming assuming
temperature
non-riming non-riming conditions non-riming
range
conditions conditions
Overall height 37 cm (14.6 in) 40 cm (15.7 in) 38 cm (15 in)
Overall length 55 cm (21.7 in) 57 cm (22.4 in) 65 cm (25.6 in)
Propeller
18 cm (7.1 in) 20 cm (7.9 in)
diameter
Mounting pipe
34 mm (1.34 in) outer diameter; standard 1.0 in IPS schedule 40
description
Weight 1.5 kg (3.2 lb) 1 kg (2.2 lb) 1.1 kg (2.5 lb)

7. Installation
If you are programming your data logger by using Short Cut, skip Wiring (p. 8) and Programming
(p. 9). Short Cut does this work for you. See QuickStart (p. 2) for a Short Cut tutorial.

7.1 Wiring
Connections to Campbell Scientific data loggers are given in Table 7-1 (p. 9). When Short Cut
software is used to create the data logger program, the sensor is wired to the terminals shown in
the wiring diagram created by Short Cut.

Wind Monitor Series 8

Table 7-1: Wire color, wire function, and data logger connection
Wire color Wire function Data logger connection terminal
U configured for pulse input1, P (pulse input),
Red WS signal
or P_LL (pulse, low-level AC)
Black WS signal reference ⏚
U configured for single-ended analog input1,
Green WD signal
SE (single-ended, analog input)
U configured for voltage excitation1, EX,
Blue WD voltage excitation
VX (voltage excitation)
White WD signal reference ⏚ (analog ground)
Clear Shield ⏚ (analog ground)
1U terminals are automatically configured by the measurement instruction.

7.2 Programming
Short Cut is the best source for up-to-date data logger programming code. If your data
acquisition requirements are simple and you are connecting the sensor to a pulse terminal, you
can probably create and maintain a data logger program exclusively by using Short Cut. If your
data acquisition needs are more complex, the files that Short Cut creates are a great source for
programming code to start a new program or add to an existing custom program.

NOTE:
Short Cut cannot edit programs after they are imported and edited in CRBasic Editor.

A Short Cut tutorial is available in QuickStart (p. 2). If you wish to import Short Cut code into
CRBasic Editor to create or add to a customized program, follow the procedure in Importing
Short Cut code into CRBasic Editor (p. 17). Programming basics for CRBasic data loggers are
provided in the following sections. A complete program is provided in Example program (p. 18).
Programming basics and programming examples for Edlog data loggers are provided at
www.campbellsci.com\old-manuals .

7.2.1 Wind speed

Wind speed is measured by using the PulseCount() instruction. Syntax of the the
PulseCount() instruction is:

PulseCount(Dest, Reps, PChan, PConfig, POption, Mult, Offset)

Wind Monitor Series 9

Set the PConfig parameter to Low Level AC and the POption parameter to Frequency.
The expression for wind speed (U) is:
U = Mx + B
where
M = multiplier
x = number of pulses per second (Hertz)
B = offset
Table 7-2 (p. 10) lists the multipliers to obtain miles/hour or meters/second when the
measurement instruction is configured to output Hz.

Table 7-2: Wind speed multiplier

Miles/hour Meters/second
Model
output output
05103 0.2192 0.0980
05108 or 05108-45 0.3726 0.1666
05305 0.2290 0.1024

Set the offset to zero since the helicoid propeller calibration passes through zero (Gill, 1973;
Baynton, 1976).

7.2.2 Wind direction

The wind vane is coupled to a 10 kΩ potentiometer, which has a 5-degree electrical dead band
between 355 and 360 degrees. A 1 MΩ resistor between the signal and ground pulls the signal to
0 mV (0 degrees) when wind direction is in the dead band (between 355 and 360 degrees).
Wind direction is measured by the BRHalf() instruction.
Some CRBasic measurement sequences can cause the measurement of the wind direction to
return a negative wind direction (–30º) while in the dead band. To overcome this problem, all
program examples use a delay of 20 ms (20,000 μs) and set any negative wind direction values to
0.0: If WindDir < 0, then WindDir = 0.0.
The excitation voltage, range codes, and multipliers for the different data logger types are listed
in Table 7-3 (p. 11). Wind direction measurement theory (p. 23) has additional information on the
BRHalf() measurement instruction.

Wind Monitor Series 10

Table 7-3: Parameters for wind direction
CR800,
CR300
CR850, CR1000X CR6 CR3000
Series
CR1000
Measurement range mV2500 mV2500 mV5000 mV5000 mV5000
Excitation voltage 2500 mV 2500 mV 2500 mV 2500 mV 5000 mV
Reverse excitation NA True True True True
Delay or settling time 20000 µs 20000 µs 20000 µs 20000 µs 20000 µs
Multiplier 355 355 355 355 355
Offset 0 0 0 0 0

7.2.3 WindVector processing instruction

The WindVector output is used to process and store mean wind speed, unit vector mean wind
direction, and standard deviation of the wind direction (optional) by using the measured wind
speed and direction samples.

7.3 Siting
Locate wind sensors away from obstructions such as trees or buildings. Generally, there should
be a horizontal distance of at least ten times the height of the obstruction between the wind
monitor and the obstruction. If the sensors need to be mounted on a roof, the height of the
sensors above the roof, should be at least 1.5 times the height of the building. See References (p.
16) for a list of references that discuss siting wind speed and direction sensors.

7.4 Assembly and mounting

Materials required:
l 5/64-inch hex key wrench
l 1/2-inch open end wrench
l Compass and declination angle for the site (see Wind direction sensor orientation [p. 20])
l Small screwdriver provided with data logger
l UV resistant cable ties
l 6-inch to 10-inch torpedo level

Wind Monitor Series 11

 l Unthreaded aluminum pipe, 1-inch IPS, 12-inch length (shipped with the sensor)
l 1-inch-by-1-inch Nu-Rail crossover fitting
l Wind monitor body
l Propeller
l Orientation ring
l Ferrite choke (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.

Figure 7-1. 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

Wind Monitor Series 12

 oriented north-south, east west, or any other angle desired. Wind direction sensor
orientation (p. 20) 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 Wind direction sensor orientation
(p. 20).
8. Use the torpedo level to ensure that 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.

Figure 7-2. 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.

Wind Monitor Series 13

 Figure 7-3. CM221 Right-Angle Mounting Kit

Figure 7-4. The CM216 allows the wind monitor to mount atop a tripod mast

8. Sensor maintenance
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 by using the
Propeller Torque Disc as described in the R. M. Young manual (see www.youngusa.com/product-
category/wind-sensors-accessories ).
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 by using R. M. Young Vane Torque Gauge.

Wind Monitor Series 14

 NOTE:
Campbell Scientific recommends factory replacement of the bearings and potentiometer.
Refer to the Assistance page of this 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 manuals (www.youngusa.com) ). A video that describes changing the
bearings is available at: www.campbellsci.com/videos/wind-monitor-bearing-replacement .

9. Troubleshooting
9.1 Wind direction
Symptom: NAN, –9999, or no change in direction

1. Check that the sensor is wired to the excitation and single-ended terminal specified by the
measurement instruction.
2. Verify that the excitation voltage and range code are correct for the data logger type.
3. Disconnect the sensor from the data logger and use an ohmmeter to check the
potentiometer. Resistance should be about 10 kΩ between the blue and white wires. The
resistance between either the blue/green or white/green wires should vary between about
1 kΩ to 11 kΩ depending on vane position. Resistance when the vane is in the 5 degree
dead band should be about 1 MΩ.

Symptom: Incorrect wind direction

1. Verify that the excitation voltage, range code, multiplier and offset parameters are correct
for the data logger type.
2. Check orientation of sensor as described in Assembly and mounting (p. 11).

Wind Monitor Series 15

 9.2 Wind speed
Symptom: No wind speed

1. Check that the sensor is wired to the pulse terminal specified by the pulse count instruction.
2. Disconnect the sensor from the data logger and use an ohmmeter to check the coil. The
resistance between the red and black wires should be about 2075 Ω. Infinite resistance
indicates an open coil; low resistance indicates a shorted coil.
3. Verify that the configuration code, and multiplier and offset parameters for the pulse count
instruction are correct for the data logger type.

10. References
IEC 61400 Part 12-1: Wind turbine generator systems Part 12: Wind Turbine Power Performance
Testing.
Wind vector information:
http://www.windspeed.co.uk/ws/index.php?option=faq&task=viewfaq&Itemid=5&artid=29 .
Gill, G.C., 1973: The Helicoid Anemometer Atmosphere, II, 145–155.
Baynton, H.W., 1976: Errors in Wind Run Estimates from Rotational Anemometers, Bul. Am. Met.
Soc., vol. 57, No. 9, 1127–1130.
The following references give detailed information on siting wind speed and wind direction
sensors.
EPA, 1989: Quality Assurance Handbook for Air Pollution Measurements System, Office of
Research and Development, Research Triangle Park, NC, 27711.
EPA, 1987: On-Site Meteorological Program Guidance for Regulatory Modeling Applications, EPA-
450/4-87-013, Office of Air Quality Planning and Standards, Research Triangle Park, NC
27711.
The State Climatologist, 1985: Publication of the American Association of State Climatologists:
Height and Exposure Standards, for Sensors on Automated Weather Stations, vol. 9, No. 4.
WMO, 1983: Guide to Meteorological Instruments and Methods of Observation, World
Meteorological Organization, No. 8, 5th edition, Geneva, Switzerland.

Wind Monitor Series 16

Appendix A. Importing Short
Cut code into CRBasic Editor
Short Cut creates a .DEF file that contains wiring information and a program file that can be
imported into CRBasic Editor. By default, these files reside in the C:\campbellsci\SCWin folder.
Import Short Cut program file and wiring information into CRBasic Editor:

1. Create the Short Cut program, then save it. Click the Advanced tab then the CRBasic Editor
button. Your program file will open in CRBasic with a generic name. Provide a meaningful
name and save the CRBasic program. This program can now be edited for additional
refinement.

NOTE:
Once the file is edited with CRBasic Editor, Short Cut can no longer be used to edit the
program.

2. To add the Short Cut wiring information into the new CRBasic program, open the .DEF file
located in the C:\campbellsci\SCWin folder. Copy the wiring information found at the
beginning of the .DEF file.
3. Go into the CRBasic program and paste the wiring information at the beginning of the
program.
4. In the CRBasic program, highlight the wiring information, right-click, and select Comment
Block. This adds an apostrophe (') to the beginning of each of the highlighted lines, which
instructs the data logger compiler to ignore those lines when compiling. The Comment
Block feature is demonstrated at about 5:10 in the CRBasic | Features video .

Wind Monitor Series 17

Appendix B. Example program
The following program measures the 05103 every 5 s, and stores mean wind speed, unit vector
mean direction, and standard deviation of the direction every 60 minutes. Wiring for the example
is given in Table B-1 (p. 18).

Table B-1: Wiring for example program

Color Wire label CR1000X
Red WS Signal P1
Black WS Reference ⏚
Green WD Signal SE 1
Blue WD Volt Excit VX 1
White WD Reference ⏚
Clear Shield ⏚

Wind Monitor Series 18

 CRBasic Example 1: CR1000X example program

'CR1000X
'Declare Variables and Units
Public Batt_Volt
Public WS_ms
Public WindDir
Units Batt_Volt=Volts
Units WS_ms=meters/second
Units WindDir=Degrees

'Define Data Tables

DataTable(Hour,True,-1)
DataInterval(0,60,Min,10)
WindVector (1,WS_ms,WindDir,FP2,False,0,0,0)
FieldNames("WS_ms_S_WVT,WindDir_D1_WVT,WindDir_SD1_WVT")
EndTable

'Main Program
BeginProg
Scan(5,Sec,1,0)
'Default Data Logger Battery Voltage measurement Batt_Volt:
Battery(Batt_Volt)

'05103 Wind Speed & Direction Sensor measurements WS_ms and WindDir:
'WS_ms
PulseCount(WS_ms,1,P1,5,1,0.098,0)
'WindDir
BrHalf(WindDir,1,mV5000,1,Vx1,1,2500,True,20000,60,355,0)

If WindDir>=360 OR WindDir<0 Then WindDir=0

'Call Data Tables and Store Data

CallTable(Hour)
NextScan
EndProg

Wind Monitor Series 19

Appendix C. Wind direction
sensor orientation
C.1 Determining true north and sensor
orientation
Orientation of the wind direction sensor is done after the data logger has been programmed,
and the location of true north has been determined. True north is usually found by reading a
magnetic compass and applying the correction for magnetic declination; where magnetic
declination is the number of degrees between true north and magnetic north. The preferred
method to obtain the magnetic declination for a specific site is to use a computer service offered
by NOAA at www.ngdc.noaa.gov/geomag . The magnetic declination can also be obtained
from a map or local airport. A general map showing magnetic declination for the contiguous
United States is shown in Figure C-1 (p. 21).
Declination angles east of true north are considered negative, and are subtracted from 360
degrees to get true north as shown Figure C-2 (p. 21) (0° and 360° are the same point on a
compass). For example, the declination for Logan, Utah is 11.78° East (11 August 2015). True north
is 360° – 11.78°, or 348.22° as read on a compass. Declination angles west of true north are
considered positive, and are added to 0 degrees to get true north as shown in Figure C-3 (p. 22).
Orientation is most easily done with two people, one to aim and adjust the sensor, while the
other observes the wind direction displayed by the data logger.

1. Establish a reference point on the horizon for true north.

2. Sighting down the instrument center line, aim the nose cone, or counterweight at true
north. Display the input location or variable for wind direction by using a laptop or
keyboard display.
3. Loosen the U-bolt on the CM220 or the set screws on the Nu-Rail that secure the base of
the sensor to the crossarm. While holding the vane position, slowly rotate the sensor base
until the data logger indicates 0 degrees. Tighten the set screws.

Wind Monitor Series 20

 Figure C-1. Magnetic declination for the contiguous United States (2015)

Figure C-2. Declination angles east of true north are subtracted from 0 to get true north

Wind Monitor Series 21

Figure C-3. Declination angles west of true north are added to 0 to get true north

Wind Monitor Series 22

Appendix D. Wind direction
measurement theory
It is not necessary to understand the concepts in this section for the general operation of the
05103 with a Campbell Scientific data logger.

Figure D-1. 05103 potentiometer in a half bridge circuit

The BRHalf CRBasic instruction outputs a precise excitation voltage (Vx), and measures the
voltage between the wiper and ground (Vs). The resistance between the wiper and ground (Rs),
and Vs vary with wind direction. The measurement result is the ratio of the measured voltage to
the excitation voltage (Vs/Vx). This ratio is related to the resistance as shown in this equation:

The maximum value that Rs will reach is Rf, just before it crosses over from the west side of north
to the east side of north (at this point Rt = 0). Vs / Vx reaches its maximum value of 1.0 mV/mV at
355 degrees. The multiplier to convert Vs/Vx to degrees is 355 degrees / 1.0 Vs/Vx = 355. Refer to
the data logger manual for more information on the bridge measurements.

Wind Monitor Series 23

Limited warranty
Products manufactured by Campbell Scientific are warranted by Campbell Scientific to be free
from defects in materials and workmanship under normal use and service for twelve months
from the date of shipment unless otherwise specified on the corresponding product webpage.
See Product Details on the Ordering Information pages at www.campbellsci.com . Other
manufacturer's products, that are resold by Campbell Scientific, are warranted only to the limits
extended by the original manufacturer.
Refer to www.campbellsci.com/terms#warranty for more information.
CAMPBELL SCIENTIFIC EXPRESSLY DISCLAIMS AND EXCLUDES ANY IMPLIED WARRANTIES OF
MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE. Campbell Scientific hereby
disclaims, to the fullest extent allowed by applicable law, any and all warranties and conditions
with respect to the Products, whether express, implied or statutory, other than those expressly
provided herein.
Assistance
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Products shipped to Campbell Scientific require a Returned Materials Authorization (RMA) or
Repair Reference number and must be clean and uncontaminated by harmful substances, such
as hazardous materials, chemicals, insects, and pests. Please complete the required forms prior to
shipping equipment.
Campbell Scientific regional offices handle repairs for customers within their territories. Please
see the back page for the Global Sales and Support Network or visit
www.campbellsci.com/contact to determine which Campbell Scientific office serves your
country.
To obtain a Returned Materials Authorization or Repair Reference number, contact your
CAMPBELL SCIENTIFIC regional office. Please write the issued number clearly on the outside of
the shipping container and ship as directed.
For all returns, the customer must provide a “Statement of Product Cleanliness and
Decontamination” or “Declaration of Hazardous Material and Decontamination” form and
comply with the requirements specified in it. The form is available from your CAMPBELL
SCIENTIFIC regional office. Campbell Scientific is unable to process any returns until we receive
this statement. If the statement is not received within three days of product receipt or is
incomplete, the product will be returned to the customer at the customer’s expense. Campbell
Scientific reserves the right to refuse service on products that were exposed to contaminants that
may cause health or safety concerns for our employees.
Safety
DANGER — MANY HAZARDS ARE ASSOCIATED WITH INSTALLING, USING, MAINTAINING, AND WORKING ON OR AROUND TRIPODS, TOWERS,
AND ANY ATTACHMENTS TO TRIPODS AND TOWERS SUCH AS SENSORS, CROSSARMS, ENCLOSURES, ANTENNAS, ETC. FAILURE TO PROPERLY
AND COMPLETELY ASSEMBLE, INSTALL, OPERATE, USE, AND MAINTAIN TRIPODS, TOWERS, AND ATTACHMENTS, AND FAILURE TO HEED
WARNINGS, INCREASES THE RISK OF DEATH, ACCIDENT, SERIOUS INJURY, PROPERTY DAMAGE, AND PRODUCT FAILURE. TAKE ALL REASONABLE
PRECAUTIONS TO AVOID THESE HAZARDS. CHECK WITH YOUR ORGANIZATION'S SAFETY COORDINATOR (OR POLICY) FOR PROCEDURES AND
REQUIRED PROTECTIVE EQUIPMENT PRIOR TO PERFORMING ANY WORK.
Use tripods, towers, and attachments to tripods and towers only for purposes for which they are designed. Do not exceed design limits. Be familiar
and comply with all instructions provided in product manuals. Manuals are available at www.campbellsci.com. You are responsible for conformance
with governing codes and regulations, including safety regulations, and the integrity and location of structures or land to which towers, tripods, and
any attachments are attached. Installation sites should be evaluated and approved by a qualified engineer. If questions or concerns arise regarding
installation, use, or maintenance of tripods, towers, attachments, or electrical connections, consult with a licensed and qualified engineer or
electrician.
General
l Protect from over-voltage.
l Protect electrical equipment from water.
l Protect from electrostatic discharge (ESD).
l Protect from lightning.
l Prior to performing site or installation work, obtain required approvals and permits. Comply with all governing structure-height regulations.
l Use only qualified personnel for installation, use, and maintenance of tripods and towers, and any attachments to tripods and towers. The
use of licensed and qualified contractors is highly recommended.
l Read all applicable instructions carefully and understand procedures thoroughly before beginning work.
l Wear a hardhat and eye protection, and take other appropriate safety precautions while working on or around tripods and towers.
l Do not climb tripods or towers at any time, and prohibit climbing by other persons. Take reasonable precautions to secure tripod and tower
sites from trespassers.
l Use only manufacturer recommended parts, materials, and tools.
Utility and Electrical
l You can be killed or sustain serious bodily injury if the tripod, tower, or attachments you are installing, constructing, using, or maintaining, or
a tool, stake, or anchor, come in contact with overhead or underground utility lines.
l Maintain a distance of at least one-and-one-half times structure height, 6 meters (20 feet), or the distance required by applicable law,
whichever is greater, between overhead utility lines and the structure (tripod, tower, attachments, or tools).
l Prior to performing site or installation work, inform all utility companies and have all underground utilities marked.
l Comply with all electrical codes. Electrical equipment and related grounding devices should be installed by a licensed and qualified
electrician.
l Only use power sources approved for use in the country of installation to power Campbell Scientific devices.
Elevated Work and Weather
l Exercise extreme caution when performing elevated work.
l Use appropriate equipment and safety practices.
l During installation and maintenance, keep tower and tripod sites clear of un-trained or non-essential personnel. Take precautions to prevent
elevated tools and objects from dropping.
l Do not perform any work in inclement weather, including wind, rain, snow, lightning, etc.
Maintenance
l Periodically (at least yearly) check for wear and damage, including corrosion, stress cracks, frayed cables, loose cable clamps, cable tightness,
etc. and take necessary corrective actions.
l Periodically (at least yearly) check electrical ground connections.
Internal Battery
l Be aware of fire, explosion, and severe-burn hazards.
l Misuse or improper installation of the internal lithium battery can cause severe injury.
l Do not recharge, disassemble, heat above 100 °C (212 °F), solder directly to the cell, incinerate, or expose contents to water. Dispose of spent
batteries properly.
WHILE EVERY ATTEMPT IS MADE TO EMBODY THE HIGHEST DEGREE OF SAFETY IN ALL CAMPBELL SCIENTIFIC PRODUCTS, THE CUSTOMER
ASSUMES ALL RISK FROM ANY INJURY RESULTING FROM IMPROPER INSTALLATION, USE, OR MAINTENANCE OF TRIPODS, TOWERS, OR
ATTACHMENTS TO TRIPODS AND TOWERS SUCH AS SENSORS, CROSSARMS, ENCLOSURES, ANTENNAS, ETC.
Campbell Scientific Regional Offices

Australia France Thailand

Location: Garbutt, QLD Australia Location: Montrouge, France Location: Bangkok, Thailand
Phone: 61.7.4401.7700 Phone: 0033.0.1.56.45.15.20 Phone: 66.2.719.3399
Email: info@campbellsci.com.au Email: info@campbellsci.fr Email: info@campbellsci.asia
Website: www.campbellsci.com.au Website: www.campbellsci.fr Website: www.campbellsci.asia

Brazil Germany UK
Location: São Paulo, SP Brazil Location: Bremen, Germany Location: Shepshed, Loughborough, UK
Phone: 11.3732.3399 Phone: 49.0.421.460974.0 Phone: 44.0.1509.601141
Email: vendas@campbellsci.com.br Email: info@campbellsci.de Email: sales@campbellsci.co.uk
Website: www.campbellsci.com.br Website: www.campbellsci.de Website: www.campbellsci.co.uk

Canada India USA

Location: Edmonton, AB Canada Location: New Delhi, DL India Location: Logan, UT USA
Phone: 780.454.2505 Phone: 91.11.46500481.482 Phone: 435.227.9120
Email: dataloggers@campbellsci.ca Email: info@campbellsci.in Email: info@campbellsci.com
Website: www.campbellsci.ca Website: www.campbellsci.in Website: www.campbellsci.com

China South Africa

Location: Beijing, P. R. China Location: Stellenbosch, South Africa
Phone: 86.10.6561.0080 Phone: 27.21.8809960
Email: info@campbellsci.com.cn Email: sales@campbellsci.co.za
Website: www.campbellsci.com.cn Website: www.campbellsci.co.za

Costa Rica Spain

Location: San Pedro, Costa Rica Location: Barcelona, Spain
Phone: 506.2280.1564 Phone: 34.93.2323938
Email: info@campbellsci.cc Email: info@campbellsci.es
Website: www.campbellsci.cc Website: www.campbellsci.es