Campbell Met One 034B Instruction Manual

INSTRUCTION MANUAL

Met One 034B Wind Set

Copyright © 1980- 2016

Campbell Scientific, Inc.

Revision: 9/16

Guarantee







This equipment is guaranteed against defects in materials and workmanship.
We will repair or replace products which prove to be defective during the
guarantee period as detailed on your invoice, provided they are returned to us
prepaid. The guarantee will not apply to:

Equipment which has been modified or altered in any way without the
written permission of Campbell Scientific

Batteries
Any product which has been subjected to misuse, neglect, acts of God or

damage in transit.

Campbell Scientific will return guaranteed equipment by surface carrier
prepaid. Campbell Scientific will not reimburse the claimant for costs incurred

in removing and/or reinstalling equipment. This guarantee and the Company’s

obligation thereunder is in lieu of all other guarantees, expressed or implied,
including those of suitability and fitness for a particular purpose. Campbell
Scientific is not liable for consequential damage.

Please inform us before returning equipment and obtain a Repair Reference
Number whether the repair is under guarantee or not. Please state the faults as
clearly as possible, and if the product is out of the guarantee period it should
be accompanied by a purchase order. Quotations for repairs can be given on
request. It is the policy of Campbell Scientific to protect the health of its
employees and provide a safe working environment, in support of this policy a

“Declaration of Hazardous Material and Decontamination” form will be

issued for completion.

When returning equipment, the Repair Reference Number must be clearly
marked on the outside of the package. Complete the “Declaration of
Hazardous Material and Decontamination” form and ensure a completed copy
is returned with your goods. Please note your Repair may not be processed if
you do not include a copy of this form and Campbell Scientific Ltd reserves
the right to return goods at the customers’ expense.

Note that goods sent air freight are subject to Customs clearance fees which
Campbell Scientific will charge to customers. In many cases, these charges are
greater than the cost of the repair.

Campbell Scientific Ltd,

80 Hathern Road,

Shepshed, Loughborough, LE12 9GX, UK

Tel: [phone]

Fax: [phone]

Email: [e-mail]

www.campbellsci.co.uk

PLEASE READ FIRST

About this manual

Please note that this manual was originally produced by Campbell Scientific Inc. primarily for the North
American market. Some spellings, weights and measures may reflect this origin.

Some useful conversion factors:

Area: 1 in2 (square inch) = 645 mm2

Length: 1 in. (inch) = 25.4 mm

1 ft (foot) = 304.8 mm
1 yard = 0.914 m
1 mile = 1.609 km

In addition, while most of the information in the manual is correct for all countries, certain information
is specific to the North American market and so may not be applicable to European users.

Differences include the U.S standard external power supply details where some information (for
example the AC transformer input voltage) will not be applicable for British/European use. Please note,

however, that when a power supply adapter is ordered it will be suitable for use in your country.

Reference to some radio transmitters, digital cell phones and aerials may also not be applicable
according to your locality.

Some brackets, shields and enclosure options, including wiring, are not sold as standard items in the
European market; in some cases alternatives are offered. Details of the alternatives will be covered in
separate manuals.

Part numbers prefixed with a “#” symbol are special order parts for use with non-EU variants or for
special installations. Please quote the full part number with the # when ordering.

Mass: 1 oz. (ounce) = 28.35 g

1 lb (pound weight) = 0.454 kg

Pressure: 1 psi (lb/in2) = 68.95 mb

Volume: 1 UK pint = 568.3 ml

1 UK gallon = 4.546 litres
1 US gallon = 3.785 litres

Recycling information

At the end of this product’s life it should not be put in commercial or domestic refuse but
sent for recycling. Any batteries contained within the product or used during the
products life should be removed from the product and also be sent to an appropriate
recycling facility.

Campbell Scientific Ltd can advise on the recycling of the equipment and in some cases
arrange collection and the correct disposal of it, although charges may apply for some
items or territories.

For further advice or support, please contact Campbell Scientific Ltd, or your local agent.

Campbell Scientific Ltd, 80 Hathern Road, Shepshed, Loughborough, LE12 9GX, UK

Tel: [phone] Fax: [phone]

Email: [e-mail]

www.campbellsci.co.uk

Precautions

DANGER — MANY HAZARD S ARE ASSOCIATED WITH INSTALLING, USING, M AINTAINING, 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 COM P LE TE LY ASS E M BLE ,
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.eu or by telephoning [phone] (UK). You are responsible for conformance
with governing codes and regulati ons, including safety regulati ons, and the integrity and locati on 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 co ncerns arise regarding installation, use, or maintenance of tripods, towers,
attachments, or electrical connections, consult with a licensed and qualified engineer or electrician.

General

• Prior to performing site or installation work, obtain required approvals and permits. Comply with all
governing structure-height regulations, such as those of the FAA in the USA.

• 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.

• Read all applicable instructions carefully and understand procedures thoroughly before beginning work.

• Wear a hardhat and eye protection, and take other appropriate safety precautions while working on or

around tripods and towers.

• 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.

• Use only manufacturer recommended parts, materials, and tools.

Utility and Electrical

• 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 o

nderground utility lines.

u

• Maintain a distance of at least one-and-one-half times structure height, or 20 feet, or the distance
r

equired by applicable law, whichever is greater, between overhead utility lines and the structure (tripod,

tower, attachments, or tools).

• Prior to performing site or installation work, inform all utility companies and have all underground utilities
marked.

• Comply with all electrical codes. Electrical equipment and related grounding devices should be installed
by a licensed and qualified electrician.

r

Elevated Work and Weather

• Exercise extreme caution when performing elevated work.

• Use appropriate equipment and safety practices.

• 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.

• Do not perform any work in inclement weather, including wind, rain, snow, lightning, etc.

Maintenance

• 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.

• Periodically (at least yearly) check electrical ground connections.

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.

Table of Contents

PDF viewers: These page numbers refer to the printed version of this document. Use the
PDF reader bookmarks tab for links to specific sections.

1. Introduction ................................................................ 1

2. Precautions ................................................................ 1

3. Initial Inspection ......................................................... 1

3.1 Ships With List .................................................................................... 2

4. QuickStart ................................................................... 2

5. Overview ..................................................................... 4

6. Specifications ............................................................. 5

6.1 Wind Speed .......................................................................................... 5

6.2 Wind Direction ..................................................................................... 5

6.3 General Specifications ......................................................................... 6

7. Installation .................................................................. 6

7.1 Siting .................................................................................................... 6

7.2 Mounting Options ................................................................................ 6

7.2.1 Mount to a Crossarm ..................................................................... 6

7.2.2 Mount to Top of Tripod ................................................................ 9

7.3 Wiring .................................................................................................. 9

7.4 Programming ...................................................................................... 10

7.4.1 Wind Speed ................................................................................. 10

7.4.2 Wind Direction ........................................................................... 11

7.4.3 Wind Vector Processing Instruction ........................................... 11

7.4.4 Long Lead Lengths ..................................................................... 12

8. Maintenance and Troubleshooting ......................... 12

8.1 Maintenance ....................................................................................... 12

8.2 Troubleshooting ................................................................................. 12

8.2.1 Wind Direction ........................................................................... 12

8.2.2 Wind Speed ................................................................................. 13

9. References ................................................................ 13

Appendices

A. Importing Short Cut Code Into CRBasic Editor ... A-1

B. Example Program ................................................... B-1

i

Table of Contents

C. Wind Direction Sensor Orientation ....................... C-1

D. Wind Direction Measurement Theory ................... D-1

Figures

7-1. 034B mounted on a crossarm using a #17953 Nu-Rail® Crossover

Fitting ............................................................................................... 8

7-2. CM200 Series Crossarm with CM220 Right Angle Mounting

Bracket ............................................................................................. 8

7-3. CM216 mount ..................................................................................... 9

C-1. Declination Angles - True North to East of Magnetic North ....... C-2

C-2. Declination Angles - True North to West of Magnetic North ........ C-3

C-3. Magnetic Declination at 2012.5 (degrees relative to true north,

sitive is east).............................................................................C-3

po

D-1. 034B potentiometer in a half bridge circuit ..................................... D-1

Tables

5-1. Recommended Cable Lengths ............................................................. 5

7-1. Wire Colour, Wire Function, and Datalogger Connection .................... 9

7-2. Wind Speed Multiplier ...................................................................... 11

7-3. Parameters for Wind Direction .......................................................... 11

B-1. Wiring for Example Program .......................................................... B-1

CRBasic Example

B-1. CR1000 Program That Measures the 034B ..................................... B-1

ii

NOTE

Met One 034B Wind Set

1. Introduction

The 034B Wind Set combines a 3-cup anemometer and vane into a single
integrated package to measure wind speed and direction. It is cabled for use
with our dataloggers, and can provide measurements for a variety of
applications.

This manual provides information only for CRBasic dataloggers.
It is also compatible with most of our retired Edlog dataloggers.
For Edlog datalogger support, see an older manual at

www.campbellsci.com/old-manuals or contact Campbell

Scientific.

2. Precautions

• READ AND UNDERSTAND the Safety section at the front of this

manual.

• The 034B is a precision instrument. Please handle it with care.

• If the 034B is to be installed at heights over 6 feet, be familiar with tower

safety and follow safe tower climbing procedures.

• Danger—Use extreme care when working near overhead electrical wires.

Check for overhead wires before mounting the 034B or before raising a
tower.

• The set screw holes must be covered with labels to prevent corrosion and

assure the warranty.

• 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. Initial Inspection

Upon receipt of the 034B, inspect the packaging and contents for damage. File
damage claims with the shipping company. Immediately check package contents
against the shipping documentation (see Section 3.1, Ships With List
Contact Campbell Scientific about any discrepancies.

(p. 2)).

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.

1

Met One 034B Wind Set

3.1 Ships With List

4. QuickStart

The 034B Wind Set ships with:

(1) 1/16-inch Allen wrench
(1) Bushing from Met One
(1) Calibration Sheet
(3) Direction hub stickers
(1) ResourceDVD
(1) Wind Vane
(1) Sensor cable of user-specified length

Short Cut is an easy way to program your datalogger to measure the 034B and
assign datalogger wiring terminals. Short Cut is available as a download on

www.campbellsci.com and the ResourceDVD. It is included in installations of

LoggerNet, PC200W, PC400, or RTDAQ.

Use the following procedure to get started.

1. Open Short Cut. Click New Program.

2

Met One 034B Wind Set

2. Select Datalogger Model and Scan Interval (default of 5 seconds is OK

for most applications). Click Next.

3. Under the Available Sensors and Devices list, select the Sensors |

Meteorological | Wind Speed & Direction folder. Select 034A/034B

Wind Speed & Direction Sensor. Click to move the selection to the
Selected device window. The wind speed defaults to meters/second. This

can be changed by clicking the Wind Speed box and selecting one of the
other options.

3

Met One 034B Wind Set

4. After selecting the sensor, click Wiring Diagram to see how the sensor is

to be wired to the datalogger. The wiring diagram can be printed now or
after more sensors are added.

5. Select any other sensors you have, then finish the remaining Short Cut

steps to complete the program. The remaining steps are outlined in Short

Cut Help, which is accessed by clicking on Help | Contents |
Programming Steps.

5. Overview

6. If LoggerNet, PC400, RTDAQ, or PC200W is running on your PC, and the

PC to datalogger connection is active, you can click Finish in Short Cut
and you will be prompted to send the program just created to the
datalogger.

7. If the sensor is connected to the datalogger, as shown in the wiring

diagram in step 4, check the output of the sensor in the datalogger support
software data display to make sure it is making reasonable measurements.

The 034B, Wind Set is used to measure horizontal wind speed and direction.

Wind speed is measured with a three cup anemometer. Rotation of the cup
wheel opens and closes a reed switch at a rate 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 Met One manual contains additional information on the operating
principals, installation, and maintenance of the sensor. The Met One manual is
available at their website (www.metone.com).

Cable length for the 034B is specified when the sensor is ordered. TABLE 5-1
gives the recommended cable length for mounting the sensor at the top of the
tripod/tower with a CM202 crossarm.

4

TABLE 5-1. Recommended Cable Lengths

CM106 CM110 CM115 CM120 UT10 UT20 UT30

11 ft 14 ft 19 ft 24 ft 14 ft 24 ft 37 ft

The 034B’s cable can terminate in:

6. Specifications

Features:

Met One 034B Wind Set

• Pigtails that connect directly to a Campbell Scientific datalogger

(option –PT).

• Connector that attaches to a prewired enclosure (option –PW). Refer

to www.campbellsci.com/prewired-enclosures for more information.

• Connector that attaches to a CWS900, Wireless Sensor Interface

(option –CWS). The CWS900 allows the 034B to be used in a
wireless sensor network. Refer to www.campbellsci.com/cws900 for
more information.

• Designed for continuous, long term, unattended operation in adverse

conditions

• Constructed of light-weight aluminum

• Compatible with Campbell Scientific CRBasic dataloggers:

CR200(X) series, CR300 series, CR6 series, CR800 series, CR1000,
CR3000, CR5000, and CR9000X

6.1 Wind Speed

Operating Range: 0 to 75 m s–1 (0 to 167 mph)

Threshold: 0.4 m s

Accuracy

< 10.14 m/s (22.7 mph): 0.1 m/s (0.25 mph)
> 10.14 m/s (22.7 mph): ±1.1% of true

Output Signal: Contact closure (reed switch)

Resolution: (1.789 mph) / (scan rate in seconds)

or (0.7998 m s

Anemometer Height: 24.4 cm (9.6 in)

Anemometer Radius: 10.7 cm (4.2 in)

6.2 Wind Direction

Length: 33.5 cm (13.2 in)

Range
Mechanical: 360°
Electrical: 356° (4° open)

–1

(0.9 mph)

–1

) / (scan rate in seconds)

5

Met One 034B Wind Set

6.3 General Specifications

7. Installation

7.1 Siting

–1

Threshold: 0.4 m s

Accuracy: ±4°

Resolution: < 0.5°

Potentiometer Resistance: 0 to 10 kΩ open at crossover

Operating Temperature Range: –30 to 70 °C

Weight: 907 g (2.0 lb)

If you are programming your datalogger with Short Cut, skip Section 7.3,
Wiring
you. See Section 4, QuickStart

(p. 9), and Section 7.4, Programming (p. 10). Short Cut does this work for

(p. 2), for a Short Cut tutorial.

(0.9 mph)

Locate wind sensors away from obstructions such as trees and buildings. As a
general rule, there should be a horizontal distance of at least ten times the
height of the obstruction between the wind set 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, References
speed and direction sensors.

7.2 Mounting Options

7.2.1 Mount to a Crossarm

Tools required:

• 1/2-inch open-end wrench (for CM220)

• 5/64-inch and 1/16-inch Allen wrenches

• compass and declination angle for the site (see Appendix C, Wind

Direction Sensor Orientation

• small screw driver provided with datalogger

• UV resistant cable ties

• small pair of diagonal-cutting pliers

• 6-inch to 10-inch torpedo level

The 034B is mounted to a Campbell Scientific crossarm using either the 17953
Nu-Rail® Crossover Fitting (FIGURE 7-1), or the CM220 Right-Angle
Mounting Kit (FIGURE 7-2).

(p. 13), for a list of references that discuss siting wind

(p. C-1))

6

1. Fully insert vane arm into hub (see FIGURE 7-1).

2. Align vane with center axis of sensor (see FIGURE 7-1).

3. Using the Allen wrench, tighten set screws at the top of the hub (see

FIGURE 7-1).

Met One 034B Wind Set

CAUTION

4. Cover the set screw hole with one of the small round stickers included
with the 034B. One of these labels is already installed on the hub covering
the set screw that attaches the hub to the sensor. Extra labels are included
with the 034B to recover the holes if the sensor has to be disassembled for
maintenance.

The set screw holes must be covered with the labels to
prevent corrosion and assure the warranty.

5. Mount a CM200-series crossarm to the tripod or tower.

6. Orient the crossarm North-South, with the CM220 mount or 17953 Nu­Rail® on the North end. Appendix C, Wind Direction Sensor Orientation

(p. C-1), contains detailed information on determining True North using a

compass and the magnetic declination for the site.

7. Remove the alignment screw at the base of the 034B (FIGURE 7-1).

8. Insert the 034B into the aluminum bushing provided with the sensor (see
FIGURE 7-1).

9. Align the hole in the bushing with that in the 034B base and replace the
s

crew (see FIGURE 7-1).

10. Insert the 034B/bushing into the Nu-Rail® fitting (FIGURE 7-1) or the
CM220’s U-bolt (FIGURE 7-2).

11. Align the sensor so that the counter weight points to true South and tighte

he set screws on the Nu-Rail® or U-bolts on the CM220. Final sensor

t
orientation is done after the datalogger has been programmed to measur

e
wind direction as described in Appendix C, Wind Direction Sensor
Orientation

(p. C-1).

12. Remove the shoulder screw to allow the vane to rotate (see FIGURE 7-1).

13. Attach the sensor cable to the six pin male connector on the 034B. Make
s

ure the connector is properly keyed. Finger tighten the knurled ring.

14. Route the sensor cable along the underside of the crossarm to the tripod or
tower, and to the instrument enclosure.

15. Secure the cable to the crossarm and tripod or tower using cable ties.

n

7

Met One 034B Wind Set

CM220

CM200 Series Crossarm

FIGURE 7-1. 034B mounted on a crossarm using a #17953 Nu-Rail®

Crossover Fitting

F

IGURE 7-2. CM200 Series Crossarm with CM220 Right Angle

Mounting Bracket

8

7.2.2 Mount to Top of Tripod

⏚

The 034B can be attached to the top of a CM106B, CM110, CM115, or
CM120 tripod via the CM216 Sensor Mounting Kit (FIGURE 7-3). The
CM216 extends 10 cm (4 in) above the mast of the tripod.

Met One 034B Wind Set

7.3 Wiring

IGURE 7-3. CM216 mount

F

Connections to Campbell Scientific CRBasic dataloggers are given in TABLE

.

7-1

TABLE 7-1. Wire Colour, Wire Function, and Datalogger Connection

Datalogger Connection

Wire Colour Wire Function

Red WS Signal

U configured for pulse input

P (pulse input), or P_SW

Terminal

1

,

(pulse, switch closure input)

Black WS Signal Reference

U configured for single-ended

Green WD Signal

analog input1, SE (single-

ended, analog input)

U configured for voltage

Blue WD Voltage Excitation

excitation1, EX, or VX (voltage

excitation)

White WD Signal Reference

AG or ⏚ (analog ground)

Clear Shield

1

U channels are automatically configured by the measurement instruction.

AG or ⏚ (analog ground)

9

Met One 034B Wind Set

NOTE

NOTE

The dataloggers can also measure wind speed on a control port. With this
option the black wire is connected to the 5 V terminal.

A 034B-L Wind Set purchased directly from Met One Instruments
has a different configuration on the 6-pin connector. In addition,
they do not have the 10 kΩ resistance on the excitation line. The
wiring diagram and the multiplier and offset, for wind direction,
are different than the examples in this document.

7.4 Programming

Short Cut is the best source for up-to-date datalogger programming code.
Programming code is needed when:

If your data acquisition requirements are simple and you are connecting the
sensor to a pulse port, you can probably create and maintain a datalogger
program exclusively with 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.

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

A Short Cut tutorial is available in Section 4, 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 Appendix A, Importing Short Cut Code Into
CRBasic Editor
provided in the following sections. A complete program example for a select
CRBasic datalogger can be found in Appendix B, Example Program
Programming basics and programming examples for Edlog dataloggers are
provided at www.campbellsci.com/old-manuals.

• Creating a program for a new datalogger installation

• Adding sensors to an existing datalogger program

(p. A-1). Programming basics for CRBasic dataloggers are

(p. B-1).

10

7.4.1 Wind Speed

Wind speed is measured with the Pulse Count instruction, using the Switch
Closure configuration and set to output frequency in Hertz (see Appendix B,
Example Program

(p. B-1), for examples).

The expression for wind speed (U) is:

TABLE 7-2. Wind Speed Multiplier*

TABLE 7-3. Parameters for Wind Direction

U = MX + B

where

M = multiplier
X = number of pulses per second (Hertz)
B = offset

Met One 034B Wind Set

TABLE 7-2 lists
or miles/hour when the Pulse Count instruction is configured to output the
result in Hz.

*When configured to output counts, the multiplier above is divided by the
execution interval in seconds.

7.4.2 Wind Direction

The CR200(X) dataloggers use the ExDelSE() instruction to measure wind
direction. All other CRBasic dataloggers use the BRHalf() instruction (see
Appendix B, Example Program

Excitation voltages, range codes, and multipliers for our dataloggers are listed
in TABLE 7-3. The multiplier value converts the sensor’s millivolt output to
degrees. Appendix D, Wind Direction Measurement Theory
additional information on the measurement instructions.

the multipliers (M) and offsets (Off) to obtain metres/second

Model Metres/Second Miles/Hour

034B

M = 0.7989

Off = 0.28

(p. B-1), for example).

M = 1.787
Off = 0.63

(p. D-1), has

Range, Integration

Excitation Voltage 2500 mV 5000 mV 2500 mV 2500 mV

7.4.3 Wind Vector Processing Instruction

The Wind Vector output instruction is used to process and store mean wind
speed, unit vector mean wind direction, and standard deviation of the wind
direction (optional) from the measured wind speed and direction values.

CR3

00

Measurement

CR800

CR1000

2500 mV,

60 Hz,

reverse

excitation

CR5000
CR3000 CR200(X) CR6

5000 mV,

60 Hz,

reverse

excitation

N/A

5000 mV,

60 Hz,

reverse

excitation

Multiplier 720 720 0.288 720

Offset 0 0 0 0

11

Met One 034B Wind Set

7.4.4 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 CRBasic, increase the Settling Time
parameter of the CRBasic instruction to 20 milliseconds (20,000
microseconds).

8. Maintenance and Troubleshooting

8.1 Maintenance

Monthly

• Do a visual/audio inspection of the anemometer at low wind speeds
V

erify that the cup assembly and wind vane rotate freely. Inspect th

ensor for physical damage. Verify cups and vane are tight.

s

6 Months

• Replace anemometer bearings if operating under harsh conditions.

Annually

• Replace anemometer bearings. Refer to the Assistance page at th

eginning of this document for the procedure of returning the sensor t

b

ampbell Scientific for bearing replacement.

C

2 Years

• Replace the wind vane potentiometer and bearings. Refer to the Assistance
page at the beginning of this document for the procedure of returning the
sensor to Campbell Scientific for wind vane and bearing replacement.

8.2 Troubleshooting

8.2.1 Wind Direction

Symptom: NAN, –9999, or no change in direction

.
e

e

o

12

1. Check that the sensor is wired to the excitation and single-ended channel

specified by the measurement instruction.

2. Verify that the excitation voltage and range code are correct for th

atalogger type.

d

3. Disconnect the sensor from the datalogger and use an ohm meter to check

the potentiometer. Resistance should vary from 11 to 21 kohms betwee
t

he blue and green wires depending on vane position. Resistance should

vary from 1 to 11 kohms between the white and green wires depending o

ne position.

va

e

n

n

Met One 034B Wind Set

Symptom: Incorrect wind direction

1. Verify that the excitation voltage, range code, multiplier and offset
parameters are correct for the datalogger type.

8.2.2 Wind Speed

9. References

2. Check orientation of sensor as described in Section 7, Installation

Symptom: No wind speed

1. Check that the sensor is wired to the pulse channel specified by the pulse
count instruction.

2. Disconnect the sensor from the datalogger and use an ohm meter to check
the reed switch. The resistance between the red and black wires should
vary from infinite (switch open) to less than 1 ohm (switch closed) as the
cupwheel is slowly turned.

3. Verify that the configuration code (switch closure, Hertz), and multiplier
and offset parameters for the pulse count instruction are correct for th

atalogger type.

d

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.

(p. 6).

e

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.

13

Met One 034B Wind Set

14

Appendix A. Importing Short Cut Code

NOTE

Into CRBasic Editor

This tutorial shows:

• How to import a Short Cut program into a program editor for
additional refinement

• How to import a wiring diagram from Short Cut into the comments of
a custom program

Short Cut creates files, which can be imported into CRBasic Editor. Assuming
defaults were used when Short Cut was installed, these files reside in the
C:\campbellsci\SCWin folder:

• .DEF (wiring and memory usage information)

• .CR2 (CR200(X)-series datalogger code)

• .CR300 (CR300-series datalogger code)

• .CR6 (CR6-series datalogger code)

• .CR8 (CR800-series datalogger code)

• .CR1 (CR1000 datalogger code)

• .CR3 (CR3000 datalogger code)

• .CR5 (CR5000 datalogger code)

• .CR9 (CR9000(X) datalogger code)

Use the following procedure to import Short Cut code and wiring diagram into
CRBasic Editor.

1. Create the Short Cut program following the procedure in Section 4
QuickStart

f

ile name used when saving the Short Cut program.

2. Open CRBasic Editor

3. Click File | Open. Assuming the default paths were used when Short Cut
was installed, navigate to C:\CampbellSci\SCWin folder. The file of
i

nterest has the .CR6, .CR1, .CR8, or .CR3 extension. Select the file and

click Open.

4. Immediately save the file in a folder different from
C:\Campbellsci\SCWin, or save the file with a different file name.

Once the file is edited with CRBasic Editor, Short Cut can no
longer be used to edit the datalogger program. Change the name
of the program file or move it, or Short Cut may overwrite it next
time it is used.

5. The program can now be edited, saved, and sent to the datalogger.

6. Import wiring information to the program by opening the associated .DEF
file. Copy and paste the section beginning with heading “-Wiring for
CRXXX–” into the CRBasic program, usually at the head of the file. After
pasting, edit the information such that an apostrophe (') begins each line.
This character instructs the datalogger compiler to ignore the line when
c

ompiling.

(p. 2). Finish the program and exit Short Cut. Make note of the

.

,

A-1

Appendix B. Example Program

TABLE B-1. Wiring for Example Program

⏚

⏚

⏚

CRBasic Example B-1. CR1000 Program That Measures the 034B

EndProg

The following CR1000 program measures the 034B every 5 seconds, 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.

Colour Description CR1000

Red Wind Speed Signal

Black Wind Speed Reference

Green Wind Direction Signal

Blue Wind Direction Excitation

White Wind Direction Reference

Clear Wind Direction Shield

'CR1000
'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(Table1,True,-1)

DataInterval(0,60,Min,10)
WindVector (1,WS_ms,WindDir,FP2,False,0,0,0)
FieldNames("WS_ms_Avg,WindDir_Avg,WindDir_StDev")

EndTable

P1

SE 1

EX 1

Main Program

'

BeginProg

Scan(5,Sec,1,0)

'Default Datalogger Battery Voltage measurement Batt_Volt:

Battery(Batt_Volt)

'034A/034B Wind Speed & Direction Sensor measurements WS_ms and WindDir:

PulseCount(WS_ms,1,1,2,1,0.7989,0.28)
If WS_ms=0.2811 Then WS_ms=0

BrHalf(WindDir,1,mV2500,1,1,1,2500,True,0,_60Hz,720.0,0) 'Use 5000 mV
If WindDir>=360 OR WindDir < 0 Then WindDir=0 'excitation for

'Call Data Tables and Store Data 'the CR3000 and

CallTable(Table1) 'CR5000 dataloggers

NextScan

B-1

Appendix C. Wind Direction Sensor

Declination angles for True North to the East of
Magnetic North are added to 0, therefore True
North reading is (0+15 = ) 15 for this specific
case.

MAGNETIC NORTH

NEEDLE POINTS TO MAGNETIC
NORTH

TRUE NORTH (map bearing) 15 EAST OF MAGNETIC NORTH

Point the wind direction sensor
to TRUE NORTH (15) bearing.

Orientation

To get optimum wind direction data from your weather station, it is recommended that you
set up your wind direction sensor with reference to true north (rather than magnetic north).
This Appendix provides advice on how to achieve this.

C.1 Magnetic Declination

Magnetic declination is sometimes referred to as the magnetic variation or the
magnetic compass correction. It is the angle formed between true north and the
projection of the magnetic field vector on the horizontal plane. Magnetic
declination varies according to geographical location. In the UK, for instance, it
changes by over eight degrees from the most Easterly to the most Westerly
points. Also, the magnetic pole tends to wander or drift, so its location can
change over time, and so it is recommended that wind direction measurements
are made with reference to true north.

C.2 Determining True North

The difference between true and magnetic north is easily corrected by adding or
subtracting the difference between the two readings as explained below. Maps are
always drawn in relation to the true north pole, and ordnance survey maps will
normally show the offset or declination angle between true and magnetic north.

To find true north for a specific site do the following:

1. First establish the declination angle (or offset) between magnetic and true
north, usually from an ordnance survey map, as described above.

2. Establish the position of magnetic north accurately, using a good quality
compass.

3. Add (or subtract) the declination angle to find the position of true north for
your site. (In the UK the declination angle from magnetic to true north will
always be to the east, and so will be added to the magnetic north value, as
shown in Figure A-1, below.)

Figure C-1 Declination Angles – True North to East of Magnetic North

C-1

03002, 03101 & 03001 Wind Sentry

Declination angles for True North to the West of
Magnetic North are subtracted from 360,
therefore True North reading is (360– 15 = ) 345
for this specific case.

MAGNETIC NORTH

COMPASS NEEDLE POINTS TO
MAGNETIC NORTH

TRUE NORTH (map bearing) 15 WEST OF MAGNETIC NORTH

Point the wind direction sensor to
TRUE NORTH (345) bearing.

Figure C-2 Declination Angles – True North to West of Magnetic North

Figure C-3 Magnetic Declination at 2012.5 (degrees relative to true north,

C.3 Setting Up the Wind Direction Sensor on the Basic

Weather Station

Setting up the wind direction sensor for correct orientation is most easily done
with two people – one person to aim and adjust the sensor and a second person to
observe the wind direction readings from the datalogger. Ideally use RS232
Direct Link to laptop computer to view the readings.

C-2

positive is east)

Appendix C. Wind Direction Sensor Orientation

1. Fully install your weather station and establish communications with the
datalogger.

2. Establish a reference point on the horizon coinciding with True North.

3. Sight down the centre line of the direction sensor and aim its nose cone at this
reference point.

4. Display the value for wind direction using the Monitor Mode of PC200W if
using RS232 Direct Link to a laptop computer to view the reading.

5. Loosen the lower ‘orientation’ fitting band clamp on the Wind Sentry arm so
that it can be rotated by hand. (Do not loosen the upper clamp).

6. While holding the vane in the correct (true north) position at all times,
carefully rotate the bracket until the datalogger indicates 0 degrees. (This
procedure will require some care as the whole sensor body will move with the
arm.)

7. Fully re-tighten the band clamp, ensuring that the datalogger reading (0) is
unchanged.

Once set up as described above, the complete Wind Sentry can be removed from
the mount by loosening the upper band clamp only. The spigot in the mounting
device will ensure that it is replaced in the correct orientation.

C-3

Appendix D. Wind Direction Measurement Theory

It is not necessary to understand the concepts in this section for the general
operation of the 034B, Wind Set with a Campbell Scientific datalogger.

A 034B purchased from Campbell Scientific has a 9.53 kΩ fixed resistor and a
variable resistor on the excitation line. The variable resistor is adjusted by the
manufacturer so its resistance plus the 9.53 kΩ resistor equals the resistance of
the potentiometer (R

= Rs + Rt).

f

FIGURE D-1. 034B potentiometer in a half bridge circuit

The vanes are calibrated due south and then the potentiometer is adjusted until
each half of the potentiometer has equal resistance.

D-1

Campbell Scientific Companies

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Please visit www.campbellsci.com to obtain contact information for your local US or international representative.

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