Vaisala WAA151 User manual

M210293EN-C
User Guide
Vaisala Anemometer
WAA151

PUBLISHED BY
Vaisala Oyj
Vanha Nurmijärventie 21, FI-01670 Vantaa, Finland
P.O. Box 26, FI-00421 Helsinki, Finland
[phone]
Visit our Internet pages at www.vaisala.com.
© Vaisala Oyj 2018
No part of this document may be
reproduced, published or publicly
displayed in any form or by any
means, electronic or mechanical
(including photocopying), nor
may its contents be modified,
translated, adapted, sold or
disclosed to a third party without
prior written permission of the
copyright holder. Translated
documents and translated
portions of multilingual
documents are based on the
original English versions. In
ambiguous cases, the English
versions are applicable, not the
translations.
The contents of this document are
subject to change without prior
notice.
Local rules and regulations may
vary and they shall take
precedence over the information
contained in this document.
Vaisala makes no representations
on this document’s compliance
with the local rules and
regulations applicable at any
given time, and hereby disclaims
any and all responsibilities related
thereto.
This document does not create
any legally binding obligations for
Vaisala towards customers or end
users. All legally binding
obligations and agreements are
included exclusively in the
applicable supply contract or the
General Conditions of Sale and
General Conditions of Service of
Vaisala.

Table of Contents
1. About This Document...................................................................................... 3
1.1 Version Information.............................................................................................3
1.2 Related Manuals...................................................................................................3
1.3 Documentation Conventions..............................................................................3
1.4 Trademarks...........................................................................................................4
2. Product Overview.............................................................................................. 5
2.1 Vaisala Anemometer WAA151............................................................................ 5
2.2 Safety.................................................................................................................... 5
2.2.1 ESD Protection..............................................................................................6
2.3 Regulatory Compliances.....................................................................................6
3. Installation............................................................................................................ 7
3.1 Selecting Location............................................................................................... 7
3.2 Mounting Wind Sensors on Cross Arm........................................................... 10
3.3 Connecting the Anemometer............................................................................ 11
3.4 Verifying Installation........................................................................................... 11
4. Maintenance........................................................................................................12
4.1 Cleaning the Anemometer................................................................................ 12
4.2 Testing Anemometer Operation.......................................................................12
4.3 Replacing Consumables.................................................................................... 12
4.4 Reassembling the Anemometer.......................................................................14
5. Troubleshooting................................................................................................16
6. Technical Data....................................................................................................17
6.1 WAA151 Specifications.......................................................................................17
6.2 Spare Parts and Accessories.............................................................................19
6.3 MTBF....................................................................................................................19
6.4 MTTR...................................................................................................................20
Technical Support............................................................................................ 21
Warranty and Product Returns..................................................................... 21
Recycling............................................................................................................ 21
Table of Contents
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WAA151 User Guide M210293EN-C
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1. About This Document
1.1 Version Information
Table 1 Document Versions
Document Code Date Description
M210293EN-C November 2018 Updated spare part descriptions of ZZ45037
and ZZ45037SPEC.
M210293EN-B August 2018 Installation instructions updated. Connector
type and item code changed.
M210293EN-A April 2002 First version
1.2 Related Manuals
Table 2 Related Manuals
Document Code Name
M210349EN Vaisala Cross Arm WAC151 User Guide
M210294EN Vaisala Wind Vane WAV151 User Guide
M210822EN Vaisala Serial Wind Transmitter WAC155 User Guide
1.3 Documentation Conventions
Warning alerts you to a serious hazard. If you do not read and
follow instructions carefully at this point, there is a risk of injury or even death.
WARNING!
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.
CAUTION!
Note highlights important information on using the product.
Chapter 1 – About This Document
3

Tip gives information for using the product more eciently.
Lists tools needed to perform the task.
Indicates that you need to take some notes during the task.
1.4 Trademarks
Vaisalaâis a registered trademark of Vaisala Oyj.
All other product or company names that may be mentioned in this publication are trade
names, trademarks, or registered trademarks of their respective owners.
WAA151 User Guide M210293EN-C
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2. Product Overview
2.1 Vaisala Anemometer WAA151
1Cup wheel assembly
2Sensor shaft
3Lower body
WAA151 is a fast-response, low-threshold anemometer. Three lightweight, conical cups
mounted on the cup wheel provide a linear response rate over the entire operating range, up
to 75 m/s (168 mph).
A wind-rotated chopper disc attached to the shaft of the cup generates a pulse output from a
phototransistor in the base of the sensor. The output pulse rate is directly proportional to wind
speed.
The heating element in the shaft tunnel keeps the temperature of the bearings above the
freezing level in cold climates. The nominal heating power is 10 W. Vaisala recommends that
you use a thermostat switch in the cross arm for switching the heating power on below +4 °C
(+39 °F).
2.2 Safety
The WAA151 anemometer delivered to you has been tested for safety and approved as shipped
from the factory. Note the following precautions:
Ground the product and verify outdoor installation grounding
periodically. Failure to provide proper grounding can result in injury or death
from electrical shock and can severely damage the equipment.
WARNING!
Chapter 2 – Product Overview
5

Improper modification can damage the product or lead to
malfunction. Any modification voids your warranty.
CAUTION!
2.2.1 ESD Protection
Electrostatic Discharge (ESD) can damage 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 in the
equipment housing.
To avoid delivering high static voltages to the product:
• Handle ESD-sensitive components on a properly grounded and protected ESD workbench
or by grounding yourself to the equipment chassis with a wrist strap and a resistive
connection cord.
• If you are unable to take either precaution, touch a conductive part of the equipment
chassis with your other hand before touching ESD-sensitive components.
• Hold component boards by the edges and avoid touching component contacts.
2.3 Regulatory Compliances
WAA151 complies with the following performance and environmental test standards:
WAA151 User Guide M210293EN-C
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3. Installation
3.1 Selecting Location
Finding a suitable site for the product is important for getting representative ambient
measurements. Make sure that the site represents the general area of interest.
Allow sucient clearance for the wind sensors. Do not install wind sensors next to
a building or any other object that can aect the flow of air.
Installations on top of high buildings or masts and in sites on open
grounds are vulnerable to lightning strikes. A nearby lightning strike may induce
a high-voltage surge not tolerable by the internal surge suppressors of the
instrument. Additional protection is needed in regions with frequent, severe
thunderstorms, especially when long line cables (>30 m (98 ft)) are used.
Vaisala recommends using a surge protector, such as WSP150, in all sites with an
elevated risk of a lightning strike.
CAUTION!
Chapter 3 – Installation
7

Figure 1 Recommended Mast Location in Open Area
Any object of height (h) does not remarkably disturb wind measurement at a minimum
distance of 10 × h. There must be at least 150 m (500 ft) open area in all directions from the
mast. Minimum distance between the mast and obstacles is ten times the height of an
obstacle.
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