Vaisala WMS301 User manual

USER'S GUIDE
Combined Wind Senso
r
WMS301 and WMS302
M210375en-A

PUBLISHED BY
Vaisala Oyj Phone (int.):[phone]
P.O. Box 26 Fax: [phone]
FIN-00421 Helsinki
Finland
Visit our Internet pages at http://www.vaisala.com/
© Vaisala 2002
No part of this manual may be reproduced in any form or by any
means, electronic or mechanical (including photocopying), nor may its
contents be communicated to a third party without prior written
permission of the copyright holder.
The contents are subject to change without prior notice.
Please observe that this manual does not create any legally binding
obligations for Vaisala towards the customer or end user. All legally
binding commitments and agreements are included exclusively in the
applicable supply contract or Conditions of Sale.

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Table of Contents
CHAPTER 1
GENERAL INFORMATION.......................................................3
About This Manual..................................................3
Contents of This Manual.......................................3
Version Information...............................................4
Feedback..............................................................4
Safety.......................................................................4
General Safety Considerations.............................4
Product Related Safety Precautions.....................5
ESD Protection.....................................................5
Regulatory Compliances........................................6
Warranty..................................................................6
CHAPTER 2
PRODUCT OVERVIEW.............................................................7
Introduction to WMS Series Wind Sensors ..........7
Product Nomenclature ...........................................9
CHAPTER 3
INSTALLATION ......................................................................11
Selecting Location................................................11
Connector..............................................................12
Installation Procedure..........................................14
Initial Check........................................................14
Mounting.............................................................16
Mounting Sensor to the Wind Sensor Mast....16
Mounting to a Pole Mast with WMS30KIT......17
Aligning the Sensor.............................................19
CHAPTER 4
MAINTENANCE ......................................................................21
Periodic Maintenance...........................................21
Testing Proper Operation ...................................21
Replacing Consumables.....................................21
Parts List for Consumables .................................24

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CHAPTER 5
TROUBLESHOOTING............................................................25
Common Problems ..............................................25
Technical Support................................................25
Return Instructions ..............................................26
CHAPTER 6
TECHNICAL DATA.................................................................27
Specifications....................................................... 27
Dimensions...........................................................29
MTBF .....................................................................29
MTTR .....................................................................29
List of Figures
Figure 1 WMS Series Combined Wind Sensor.......................8
Figure 2 Recommended Mast Location in Open Area..........11
Figure 3 Recommended Mast Length on the Top of
a Building ...............................................................12
Figure 4 WMS301 Connector...............................................13
Figure 5 WMS302 Connector...............................................13
Figure 6 WMS301 Principal Circuit Diagram........................14
Figure 7 WMS302 Principal Circuit Diagram........................15
Figure 8 WMS302 Factory Alignment (Models with the
Alignment Sleeve)..................................................15
Figure 9 Mounting of the Combined Wind Sensor................16
Figure 10 WMS301/WMS302 Installation with WMS30KIT....18
Figure 11 Aligning the Combined Wind Sensor......................19
Figure 12 WMS Assembly......................................................23
Figure 13 Dimensions (in mm) of the Combined Wind
Sensor....................................................................29
List of Tables
Table 1 Manual Revisions.....................................................4
Table 2 WMS Series Wind Sensor Nomenclature.................9
Table 3 Available Spare Parts.............................................24
Table 4 Some Common Problems and their Remedies......25
Table 5 Anemometer Specifications....................................27
Table 6 Vane Specifications................................................28
Table 7 Common Specifications..........................................28

Chapter 1 ___________________________________________General Information
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CHAPTER 1
GENERAL INFORMATION
This chapter provides general notes for the product.
About This Manual
This manual provides information for installing,
maintaining, and troubleshooting WMS301 and WMS302
Combined Wind Sensor.
Contents of This Manual
This manual consists of the following chapters:
- Chapter 1, General Information, provides general notes
for the product.
- Chapter 2, Product Overview, introduces the WMS301
and WMS302 Combined Wind Sensor features.
- Chapter 3, Installation, provides you with information
that is intended to help you install the wind sensor.
- Chapter 4, Maintenance, provides information that is
needed in basic maintenance of the product.
- Chapter 5, Troubleshooting, describes common problems,
their probable causes and remedies, and contact
information.

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- Chapter 6, Technical Data, provides the technical data of
WMS301 and WMS302 Combined Wind Sensor.
Version Information
Table 1 Manual Revisions
Manual Code Description
M010030en-C WMS301 & WMS302 Combined Wind
Sensors Quick Reference Guide
M210375en-A First version of the WMS301 and
WMS302 Combined Wind Sensor User's
Guide. Replaces the above mentioned
Quick Reference Guide.
Feedback
Vaisala Customer Documentation Team welcomes your
comments and suggestions on the quality and usefulness of
this publication. If you find errors or have other suggestions
for improvement, please indicate the chapter, section, and
page number. You can send comments to us by e-mail:
[e-mail]
Safety
General Safety Considerations
Throughout the manual, important safety considerations are
highlighted as follows:
WARNING Warning alerts you to a serious hazard. If you do not read
and follow instructions very carefully at this point, there is
a risk of injury or even death.

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CAUTION Caution warns you of a potential hazard. If you do not read
and follow instructions carefully at this point, the product
could be damaged or important data could be lost.
NOTE Note highlights important information on using the product.
Product Related Safety
Precautions
The device delivered to you has been tested for safety and
approved as shipped from the factory. Note the following
precautions:
WARNING Ground the product, and verify outdoor installation
grounding periodically to minimize shock hazard.
CAUTION Do not modify the unit. Improper modification can damage
the product or lead to malfunction.
ESD Protection
Electrostatic Discharge (ESD) can cause immediate or latent
damage to electronic circuits. Vaisala products are
adequately protected against ESD for their intended use.
However, it is possible to damage the product by delivering
electrostatic discharges when touching, removing, or
inserting any objects inside the equipment housing.
To make sure you are not delivering high static voltages
yourself:

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- Handle ESD sensitive components on a properly
grounded and protected ESD workbench. When this is
not possible, ground yourself to the equipment chassis
before touching the boards. Ground yourself with a wrist
strap and a resistive connection cord. When neither of the
above is possible, touch a conductive part of the
equipment chassis with your other hand before touching
the boards.
- Always hold the boards by the edges and avoid touching
the component contacts.
Regulatory Compliances
The WMS301 and WMS302 sensors comply with the
following performance and environmental test standards:
- Mechanical vibration test per 1EC-68-2-6 Fc
- RF field emission test per EN 55022 Class B
- Conducted immunity tests
- Electrostatic discharge EN61000-4-2
- RF field immunity EN6100-4-3
- Fast transient burst EN61000-4-4
Warranty
For certain products Vaisala normally gives a limited one-
year warranty. Please observe that any such warranty may
not be valid in case of damage due to normal wear and tear,
exceptional operating conditions, negligent handling or
installation, or unauthorized modifications. Please see the
applicable supply contract or Conditions of Sale for details
of the warranty for each product.

Chapter 2 ____________________________________________ Product Overview
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CHAPTER 2
PRODUCT OVERVIEW
This chapter introduces the WMS301 and WMS302
Combined Wind Sensor features.
Introduction to WMS Series Wind Sensors
WMS series wind sensors are compact sized instruments
with the wind speed and direction sensors integrated into
one unit. The sensor electronics is located inside a
watertight compartment providing full protection against
water, dust, pollutants, and electromagnetic interference.
The cup wheel shape, dimensions, and material have been
carefully designed to achieve maximum measurement
quality. The conical cups have been tested to give linear
response between wind speed and angular velocity of the
cup wheel. The polyamide plastic reinforced with carbon
fiber guarantees a rigid structure even at the highest wind
speeds.
The anemometer ball bearing assembly is composed of a
wheel shaft, a pair of low friction ball bearings, and a shaft
fixed magnet. A reed relay with electronics located in the
body of the sensor converts the cup wheel rotation to pulses.
Therefore, when properly supplied the sensor can be read
practically with any data logger, either by counting the
number of pulses within a fixed time period or measuring
the time between successive transients. In the latter method

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averaging of transient intervals should be used, since two
pulses with non-symmetric positioning are generated during
one revolution.
The balanced wind vane is integrated in the housing,
underneath the cup wheel. The circular tail is located far
enough from the body and the cup wheel to avoid
turbulence due to these structures. The vane assembly is
made of PA reinforced with glass fiber providing durable
and lightweight structure with fast response and low inertia.
The angular position of the vane is detected using an axial
symmetric rotating potentiometer. The potentiometer
features low starting and running torque, linear arc-to-
resistance transfer ratio, and long operation life.
0212-220
Figure 1 WMS Series Combined Wind Sensor
The following numbers refer to Figure 1 above:
1 = The cup wheel assembly
2 = The vane assembly
3 = The sensor compartment
WMS301 is equipped with a one-wiper type potentiometer
with an open gap of only 5 degrees. With constant voltage
applied to the potentiometer, the output voltage is directly
proportional to the azimuth angle.

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WMS302 has a two-wiper type potentiometer to overcome
the wind direction discontinuity. However, a more complex
voltage-to-direction conversion process is needed.
Product Nomenclature
Table 2 WMS Series Wind Sensor Nomenclature
Code Common Name
WMS301 Combined Wind Sensor with one
wiper potentiometer
Basic
WMS302 Combined Wind Sensor with two
wiper potentiometers
Options WMS30KIT Installation Accessories to be used
with pole masts

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Chapter 3 __________________________________________________ Installation
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CHAPTER 3
INSTALLATION
This chapter provides you with information that is intended
to help you install the wind sensor.
Selecting Location
Allow sufficient clearance for the wind sensor. Install the
wind sensor away from buildings or any other objects that
might affect the airflow.
0212-221
Figure 2 Recommended Mast Location in Open Area

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In general, any object of height (h) will not remarkably
disturb the wind measurement at a minimum distance of
10 ×h. There should be at least 150 m open area to all
directions from the mast. Refer to Figure 2 on page 11.
0212-222
Figure 3 Recommended Mast Length on the Top of a
Building
The recommended minimum length (h in Figure 3 above)
for the mast that is installed on the top of a building is 1.5
times the height of the building (H). When the diagonal (W)
is less than the height (H) the minimum length of the mast is
1.5 ×W.
Connector
The WMS301 connector is shown in Figure 4 on page 13.
The WMS302 connector is shown in Figure 5 on page 13.
Type M12 female connector, for example, made by
Lumberg, Phoenix, or Binder is suitable for connecting the
cable to the sensor.

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0212-223
Figure 4 WMS301 Connector
The following numbers refer to Figure 4 above.
1 = +Vref, voltage input
2 = DIR, signal output, wind direction
3 = GND, ground
4 = GND, ground
5 = SPD, signal output, wind speed
0212-223
Figure 5 WMS302 Connector
The following numbers refer to Figure 5 above.
1 = +Vref, voltage input
2 = DIR1, signal output, wind direction
3 = GND, ground
4 = DIR2, signal output, wind direction
5 = SPD, signal output, wind speed

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A pull up resistor, for example, 10 kΩ, is needed at SPD
output to supply the anemometer electronics. It is
recommended to use a Schmitt-trigger input with the SPD
signal.
Installation Procedure
Initial Check
After you have unpacked the sensor, check for any signs of
shipping damage. Also test that the vane and cup wheel
rotate without friction.
Before installation, use an ohmmeter to check the proper
operation of speed (SPD) and direction (DIR1 and DIR2)
outputs while rotating the cup wheel and vane slowly. For
measuring the direction, note that 10 kΩ/360º and
10 kΩ/180° potentiometers are used with WMS301 and
WMS302 respectively. For the principal circuit diagrams,
refer to Figure 6 below and Figure 7 on page 15.
0212-224
Figure 6 WMS301 Principal Circuit Diagram

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0212-225
Figure 7 WMS302 Principal Circuit Diagram
The WMS302 sensor is aligned at the factory according to
Figure 8 below. This factory alignment applies to all models
with the alignment sleeve. The alignment sleeve is secured
with a small size Allen bolt to the sensor body.
0212-226
Figure 8 WMS302 Factory Alignment (Models with
the Alignment Sleeve)

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Mounting
Mounting Sensor to the Wind Sensor Mast
After a proper location for wind measurement has been
selected, you can mount the sensor to the wind sensor mast.
The diameter of the wind sensor mast is 30 mm. To mount
the sensor, do the following:
1. Fit the cable (number 2 in Figure 9 below) through the
mounting piece (3) and connect the cable to the sensor.
0212-227
Figure 9 Mounting of the Combined Wind
Sensor
2. Place the mounting piece (3) on the top of the mast and
align the tap (5) to north.
3. Align the notch (4) to the tap (5) and attach the sensor
to the mounting piece with the plastic collar (1).

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4. Secure the mounting piece (3) to the mast by tightening
the mounting screw (6).
5. Route the sensor cable down along the mast and
always attach the cable to the mast with cable ties.
6. Mount the wind sensor mast firmly to a solid base, for
example, to a pole mast.
7. Connect the signal cable to a data logger or display
device.
Mounting to a Pole Mast with WMS30KIT
You can mount the wind sensor with a mast on the top of a
pole mast using WMS30KIT. When the mast is high, use a
combined wind sensor with a 10 m cable. You can mount
the wind sensor mast to a metallic or wooden mast.
WARNING Do not install the wind sensor above the top of the
lightning protection rod.
To mount the wind sensor mast to a metallic mast, do the
following (the numbers refer to Figure 10 on page 18):
1. Install the plastic protective plate (5) between the mast
(6) and the mounting piece.
2. Attach the mounting piece to the mast (6) using the
large clamps.
3. Attach the wind sensor mast with the wind sensor (1)
to the mast (6) using the smaller clamps.
4. Secure the cable with the fixed cable tie (3) to the wind
sensor mast.
5. Route the sensor cable down along the mast and
always attach the cable to the mast with cable ties.
6. Connect the signal cable to a data logger or display
device.

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6533
4
1
2
2
0103-010
Figure 10 WMS301/WMS302 Installation with
WMS30KIT
The following numbers refer to Figure 10 above:
1 = WMS301 or WMS302
2 = Wood screws
3 = Cable tie
4 = Wooden mast
5 = Plastic protective plate
6=Polemast