Vaisala WAC151 Manuale utente

M210349EN-C

User Guide

Cross Arm

WAC151

PUBLISHED BY

Vaisala Oyj

Vanha Nurmijärventie 21, FI-01670 Vantaa, Finland

P.O. Box 26, FI-00421 Helsinki, Finland

+358 9 8949 1

Visit our Internet pages at www.vaisala.com.

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 WAC151 Cross Arm...............................................................................5

2.2 Safety..................................................................................................................5

2.2.1 ESD protection...........................................................................................6

3. Installation..........................................................................................................7

3.1 Selecting location..............................................................................................7

3.2 Installing Cross Arm WAC151........................................................................... 9

3.3 Connecting wind sensors............................................................................... 12

3.3.1 Wiring wind sensors WAA151 and WAV151............................................13

3.3.2 Wiring wind sensors WAA252 and WAV252.........................................13

3.4 Mounting wind set on mast............................................................................14

3.5 Aligning wind set.............................................................................................16

4. Maintenance.....................................................................................................18

4.1 Visual checking................................................................................................ 18

5. Troubleshooting............................................................................................. 19

6. Technical data................................................................................................20

6.1 WAC151 speciﬁcations................................................................................... 20

Technical support............................................................................................. 21

Warranty and product returns...................................................................... 21

Recycling............................................................................................................ 21

Table of contents

WAC151 User Guide M210349EN-C

1. About this document

1.1 Version information

Table 1 Document versions

Document

code

Date Description

M210349EN-C January 2021 Updated WHP151 and WHP25 information.

M210349EN-B August 2018 Installation instructions updated.

M210349EN-A November 2002 The ﬁrst version of the WAC151 Cross Arm User's

Guide. Supersedes the Technical Reference.

1.2 Related manuals

Table 2 Related manuals

Document code Name

M210293EN Vaisala Anemometer WAA151 User Guide

M210294EN Vaisala Wind Vane WAV151 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

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.

WAC151 User Guide M210349EN-C

2. Product overview

2.1 Vaisala WAC151 Cross Arm

The WAC151 cross arm assembly supports the installation of:

• Vaisala Anemometer WAA151 and Vaisala Wind Vane WAV151

• Vaisala Heated Anemometer WAA252 and Vaisala Heated Wind Vane WAV252

The cross arm assembly consists of a junction box and an anodized aluminum tube with a

mounting clamp for installation on the top of a pole mast.

1Mounting ﬂange for Vaisala anemometer

2Junction box

3Mounting ﬂange for Vaisala wind vane

A watertight junction box includes a screw terminal block for power and signal cables. The

junction box houses a thermostat switch for controlling WAA151 and WAV151 shaft heating. The

thermostat switches on in temperatures below +4 °C (39.2 °F).

WAA252 and WAV252 do not use the cross arm thermostat switch. They have the temperature

control integrated in the sensor electronics.

The junction box has 4 cable glands. Typically, 3 cable glands are in use; 2 for sensor cables

and 1 for the signal cable. The fourth gland is reserved, for example, for the cable supplying

heating power to heated sensors.

2.2 Safety

This product has been tested for safety. 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

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.

WAC151 User Guide M210349EN-C

3. Installation

To prevent equipment damage, install an air terminal so that the tip

is as high above the instruments and sensors as possible.

CAUTION!

To prevent corrosion and oxidation, use copper paste or equivalent on screws and

connector threads.

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

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.

WAC151 User Guide M210349EN-C

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