Campbell Scientific A100LK User Manual

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100LK Anemomete

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Copyright © 2012

Campbell Scientific, Inc.

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warranted by Campbell Scientific, Inc. (“Campbell”) to be free from defects in
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A100LK 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. Cautionary Statements................................................1

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

4. Quickstart.....................................................................2

4.1 Step 1 — Mount the Sensor......................................................................2

4.2 Step 2 — Use SCWin ShortCut to Program Datalogger and

Generate Wiring Diagram ...........................................................................3

5. Overview.......................................................................5

6. Specifications ..............................................................6

7. Operation......................................................................7

7.1 Siting.........................................................................................................7

7.2 Wiring.......................................................................................................7

7.3 Programming with CRBasic and Edlog....................................................8

7.3.1 Slope and Offset Calculations.........................................................8

7.3.2 Example Programs..........................................................................8

8. Troubleshooting ..........................................................9

9. Maintenance .................................................................9

10. References ...............................................................10

Figure

4-1. A100LK mounted to a crossarm via the CM220.....................................2

Tables

7-1. Connections to Campbell Scientific Dataloggers Pulse Channels ..........7

7-2. Connections to Campbell Scientific Dataloggers Control Ports..............7

i

A100LK Anemometer

1. Introduction

The Windspeed Ltd Model A100LK Anemometer is an IEC and MEASNET
rated instrument recommended for wind energy applications where a Class 1
anemometer is required. It is primarily used in wind speed resource
assessments and in wind turbine power performance monitoring. The “-L”
designation after the A100LK model number designates a cable length.

Before installing the A100LK, please study

• Section 2, Cautionary Statements

• Section 3, Initial Inspection

• Section 4, Quickstart

2. Cautionary Statements

• The A100LK is a precision instrument. Please handle it with care.

• If the A100LK 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 A100LK or before raising a
tower.

3. Initial Inspection

• Upon receipt of the A100LK, 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.

• 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.

• Each A100LK anemometer is shipped with a MEASNET calibration

certificate that contains information concerning where the anemometer
was calibrated, the calibration procedure used, the calibration equation
obtained, and the serial number of the anemometer. Cross check the serial
number in the calibration certificate against the serial number on the
anemometer to ensure that the given sensitivity value corresponds to your
sensor.

1

A100LK Anemometer

4. Quickstart

4.1 Step 1 — Mount the Sensor

To mount the sensor, refer to Figure 4-1 and do the following.

1. Mount a CM202, CM204, or CM206 crossarm to a tripod or tower.

2. Secure the CM220 Mount to the crossarm.

3. Place the 27739 30 in. pole in the bottom of the A100LK and tighten the

thumb screws.

4. Place the bottom of the 27739 pole in the CM220's u-bolt and tighten the

nuts.

5. Use a bubble level to ensure that the anemometer is level.

6. Route the sensor cable along the underside of the crossarm to the tripod or

tower, and to the instrument enclosure.

7. Secure the cable to the 27739 pole, crossarm, and tripod or tower using

cable ties.

Thumb screw

27739 pole

CM220

Crossarm

CM220 u-bolt

CM220 u-bolt

FIGURE 4-1. A100LK mounted to a crossarm via the CM220

2

A100LK Anemometer

4.2 Step 2 — Use SCWin ShortCut to Program Datalogger and Generate Wiring Diagram

The simplest method for programming the datalogger to measure an A100LK
is to use Campbell Scientific's SCWin Short Cut Program Generator.

1. Open Short Cut and click on New Program.

2. Select datalogger and enter scan interval.

3

A100LK Anemometer

3. Select A100LK and select the right arrow to add it to the list of sensors to

be measured then select next.

4. Select the outputs then select finish.

4

5. Overview

A100LK Anemometer

5. Wire according to the wiring diagram generated by SCWin Short Cut.

The A100LK is an IEC Class 1 anemometer. It is a low-power version of the
A100L2, which was developed from the proven A100 Porton™ instrument and
R30 rotor design. The A100LK consumes little supply current, operating from
a supply as low as 5 volts.

Rotation of the A100LK's three-cup rotor is electronically converted to pulse
output signals proportional to wind speed. The A100LK produces a higher rate
of pulses per revolution (up to 13) compared to relay based sensors, making it
suitable for wind surveying where turbulence needs to be estimated.

The A100LK is a rugged instrument, constructed from anodized aluminum
alloys, stainless steel, and weather resistant plastics. A stainless steel shaft
runs in two precision, corrosion-resistant ball-races. The bearings are protected
from the entry of moisture droplets and dust, resulting in an instrument suitable
for permanent exposure to the weather.

The low power consumption, wide power supply range, pulse/frequency signal,
and first-class performance rating make this anemometer ideal for use with our
dataloggers in wind-power site surveying applications.

The A100LK is manufactured by Windspeed Ltd and then cabled by Campbell
Scientific.

5

A100LK Anemometer

6. Specifications

Features:

Compatible Dataloggers: CR10(X)

CR23X
CR800 series
CR1000
CR3000
CR5000
CR9000(X)

Threshold: 0.15 ms

• IEC Class 1 performance

• Low power

• High rate of pulses per revolution (up to 13) produced makes it

suitable for wind surveying applications where turbulence is estimated

-1

(starting speed 0.2 ms-1, stopping

-1

speed 0.1 ms

)

Maximum speed: 77.22 ms

Accuracy: l% ±0.1 ms

-1

-1

Distance Constant: 2.3m ±10%

Calibration Data: Supplied for anemometer and rotor at one test

speed to an accuracy of ±1% at +15°C, 12V
DC supply and an analog output load of 1MΩ

Temperature Range: -30° to +70°C

Height: 19.5 cm (7.68 in.)

Case Diameter: 5.5 cm (2.2 in.)

Rotor: 15.2 cm (6 in.) diameter three-cup rotor

Weight: 490 g (17.3 oz) including 3 m (10 ft) cable

Supply Voltage: 6.5 to 28 Vdc

Current Consumption: 2 mA max., 1.6 mA typical (no output load)

Power-up Time: 5 s

6

Surge Protection: Vector PC3L2 anti-surge module fitted

7. Operation

7.1 Siting

7.2 Wiring

A100LK Anemometer

Locate wind sensors away from obstructions (e.g., trees and building). As a
general rule, there should be a horizontal distance of at least ten times the
height of the obstruction between the anemometer and the obstruction. If
mounting 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 10,
References for a list of references that discuss siting wind speed and direction
sensors. For power performance applications refer to IEC 61400-12-1 which
specifies the mounting and location of anemometers.

When Short Cut for Windows software is used to create the datalogger
program, the sensor should be wired to the channels shown on the wiring
diagram created by Short Cut.

Tables 7-1 and 7-2 show the connections to Campbell Scientific dataloggers.

TABLE 7-1. Connections to Campbell Scientific Dataloggers

Pulse Channels

Color

White Signal Pulse Pulse Pulse

Red 12V 12V 12V 12V

Blue Ground G G G

Clear Shield Analog Ground Analog Ground Analog Ground

TABLE 7-2. Connections to Campbell Scientific Dataloggers

Color

White Signal C1-C8 C6-C8

Red 12V 12V 12V

Wire Label

Wire Label

CR800
CR850
CR5000
CR3000
CR1000

Control Ports

CR800
CR850
CR5000
CR3000
CR1000

CR510
CR500
CR10X

21X
CR7
CR23X

CR10X

Blue Ground G G

Clear Shield Analog Ground Analog Ground

7

A100LK Anemometer

7.3 Programming with CRBasic and Edlog

7.3.1 Slope and Offset Calculations

Wind speed is typically measured using a pulse channel. For dataloggers using
CRBasic, use the PulseCount() instruction with the pulse channel configured
for high frequency with frequency counting. For dataloggers programmed with
Edlog, use Instruction 3 and for parameter 3 specify configuration code 22 to
output frequency in Hertz.

The slope value is entered as the multiplier in the pulse count instruction. For
the best accuracy you should always obtain an individual multi-point wind
speed calibration in a reputable wind tunnel (such as MEASNET) wherever the
highest accuracy results are required.

Calculations for a nominal A100LK suggest that the nominal figures for the
datalogger would be: slope = 0.0499, offset = 0.258 (for results in m/s, best fit
over 4 to 16 m/s) (ref 2).

However, slope/offset figures from Garrad Hassan quotes consensus figures for
the A100LK as: slope = 0.0499, offset = .2400.

The example programs contained in this manual use the calculated offset value.

7.3.2 Example Programs

Pulse Port Example

The following CR1000 example program uses a pulse port to measure the
A100LK-L once a second. The program stores the mean, maximum,
minimum, and standard deviation of the measured wind speed over a 10 minute
interval.

'CR1000 Series Datalogger
'Program to measure A100LK-L and store ten minute averages

'Wiring
'White ------- Signal ------- P1
'Red --------- Power -------- 12V
'Blue -------- Power Ground - G

'White ------- Shield -------
'Declarations
Const A100LK_L_mult = .0499
Const A100LK_L_offset = .258

Public PTemp, batt_volt
Public WS_ms

'Define Data Tables
DataTable (Test,1,1000)
DataInterval (0,10,Min,10)
Minimum (1,batt_volt,FP2,0,False)
Sample (1,PTemp,FP2)
Average (1,WS_ms,FP2,False)
Maximum (1,WS_ms,FP2,False,False)
Minimum (1,WS_ms,FP2,False,False)
StdDev (1,WS_ms,FP2,False)
EndTable

8

'Main Program

BeginProg
Scan (1,Sec,0,0)
PanelTemp (PTemp,250)
Battery (batt_volt)

'A100LK Wind Speed Sensor (CSL) measurement 'WS_ms'
PulseCount(WS_ms,1,2,0,1,A100LK_L_mult,A100LK_L_offset)
If WS_ms<0.258 Then WS_ms=0

'Call data tables
CallTable Test

NextScan
EndProg

8. Troubleshooting

Symptom: No wind speed

1. Check that the sensor is wired to the Pulse channel specified by the Pulse

count instruction.

A100LK Anemometer

9. Maintenance

CAUTION

2. Verify that the Configuration Code, and Multiplier and Offset parameters

for the Pulse Count instruction are correct for the datalogger type.

Symptom: Wind speed does not change

1. For the dataloggers that are programmed with Edlog, the input location for

wind speed is not updated if the datalogger is getting “Program Table
Overruns”. Increase the execution interval (scan rate) to prevent overruns.

Every month do a visual/audio inspection of the anemometer at low wind
speeds. Verify that the anemometer bearings 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.

Disassembling an anemometer to change the bearings will
invalidate the MEASNET calibration.

MEASNET calibrations are normally valid for 12 months in the field
(assuming the anemometer is installed within 6 months of the calibration test).
In high-accuracy applications, Campbell Scientific recommends that the
anemometer be returned to us for maintenance/overhaul between deployments;
we can arrange for a new MEASNET calibration after maintenance/overhaul
where required.

Before an A100LK sensor is sent to Campbell Scientific, the customer must get
an RMA (returned material authorization) and fill out the Declaration of
Hazardous Material and Decontamination form.

9

A100LK Anemometer

10. References

1. IEC 61400 Part 12-1, “Wind turbine generator systems Part 12: Wind

Turbine Power Performance Testing”.

2. http://www.windspeed.co.uk/ws/index.php?option=faq&task=viewfaq&Ite

mid=5&artid=29.

10

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