Decagon Devices DS-2 Operator's Manual

DS-2

Sonic Anemometer

Operator’s Manual

Decagon Devices, Inc.

Version: August 29, 2013 — 16:00:00

DS-2

Decagon Devices, Inc.

2365 NE Hopkins Court

Pullman WA 99163

Phone: [phone]

Fax: [phone]

Website: www.decagon.com

Email: [e-mail] or [e-mail]

Trademarks

c

2007-2013 Decagon Devices, Inc.

All Rights Reserved

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DS-2 CONTENTS

Contents

1 Introduction 1

1.1 Customer Support . . . . . . . . . . . . . . . . . . . . 1

1.2 About This Manual . . . . . . . . . . . . . . . . . . . 1

1.3 Warranty . . . . . . . . . . . . . . . . . . . . . . . . . 2

1.4 Seller’s Liability . . . . . . . . . . . . . . . . . . . . . . 2

1.5 About DS-2 . . . . . . . . . . . . . . . . . . . . . . . . 2

1.6 Specifications . . . . . . . . . . . . . . . . . . . . . . . 3

2 Theory 4

3 Connecting the Anemometer 6

3.1 3.5 mm Stereo Plug Wiring . . . . . . . . . . . . . . . 7

3.2 Connecting to a Non-Decagon Logger . . . . . . . . . 7

3.3 Pigtail End Wiring . . . . . . . . . . . . . . . . . . . . 8

4 Communication 10

4.1 SDI-12 Communication . . . . . . . . . . . . . . . . . 10

4.2 Campbell Scientific Programs . . . . . . . . . . . . . . 12

5 Installing the DS-2 13

5.1 Attaching and leveling . . . . . . . . . . . . . . . . . . 13

5.1.1 Adjustable Length Pole . . . . . . . . . . . . . 13

5.1.2 Leveling . . . . . . . . . . . . . . . . . . . . . . 13

5.2 Orientation . . . . . . . . . . . . . . . . . . . . . . . . 13

5.3 Cleaning and Maintenance . . . . . . . . . . . . . . . . 14

5.4 Calibration . . . . . . . . . . . . . . . . . . . . . . . . 14

6 Troubleshooting 15

7 Declaration of Conformity 16

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DS-2 1 INTRODUCTION

1 Introduction

Thank you for choosing Decagon’s DS-2 Sonic Anemometer for mea­suring wind speed and direction. This manual will help you under­stand your instrument features and how to use this device success­fully.

1.1 Customer Support

If you ever need assistance with your DS-2 or have any questions or
feedback, there are several ways to contact us. Decagon has customer
service representatives available to speak with you Monday through
Friday, between 7 am and 5 pm Pacific time.

Note: If you purchased your anemometer through a distributor, please
contact them for assistance.

Email:
[e-mail] or [e-mail]

Phone:
509-332-5600

Fax:
509-332-5158

If contacting us by email or fax, please include as part of your mes­sage your instrument serial number, your name, address, phone, fax
number, and a description of your problem or question.

1.2 About This Manual

Please read these instructions before operating your instrument to
ensure that it performs to its full potential.

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1 INTRODUCTION DS-2

1.3 Warranty

The sensor has a 30-day satisfaction guarantee and a one-year war­ranty on parts and labor. Your warranty is automatically validated
upon receipt of the instrument.

1.4 Seller’s Liability

Seller warrants new equipment of its own manufacture against de­fective workmanship and materials for a period of one year from the
date of receipt of equipment.

Note: We do not consider the results of ordinary wear and tear,
neglect, misuse, or accident as defects.

The Seller’s liability for defective parts shall in no event exceed the
furnishing of replacement parts “freight on board” the factory where
originally manufactured. Material and equipment covered hereby
which is not manufactured by Seller shall be covered only by the
warranty of its manufacturer. Seller shall not be liable to Buyer for
loss, damage or injuries to persons (including death), or to property
or things of whatsoever kind (including, but not without limitation,
loss of anticipated profits), occasioned by or arising out of the instal­lation, operation, use, misuse, nonuse, repair, or replacement of said
material and equipment, or out of the use of any method or process
for which the same may be employed. The use of this equipment con­stitutes Buyer’s acceptance of the terms set forth in this warranty.
There are no understandings, representations, or warranties of any
kind, express, implied, statutory or otherwise (including, but with­out limitation, the implied warranties of merchantability and fitness
for a particular purpose), not expressly set forth herein.

1.5 About DS-2

Decagon designed the DS-2 Sonic Anemometer to measure wind
speed, direction, and even wind gusts. It is a two dimensional ul­trasonic anemometer with no moving parts that provides specified

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DS-2 1 INTRODUCTION

accuracy for long-term installations. It outputs SDI-12, and is com­patible with Decagon’s Em50, Em50R, Em50G, and other loggers
like those from Campbell Scientific.

1.6 Specifications

Wind Speed Range: 0 to 30 m/s

Wind Speed Resolution: 0.01 m/s

Wind Speed Accuracy: 0.30 m/s or < 3%, whichever is larger

Wind Direction Range: 0 to 359 degrees

Wind Direction Resolution: 1 degree

Wind Direction Accuracy: ±3 degrees

Operating Temperature Range:−40 to 50◦C

Excitation Voltage: 3.6 to 15 VDC

Current: 0.03 ma quiescent, 0.5 ma; sampling, < 0.05 ma typical

Communication: SDI-12

Diameter: 100 mm

Height (wind sensor): 75 mm

Height (total w/ mount): 155 mm

Maximum sampling speed1: 1 Hz

Output1: average speed, gust speed, direction, or vector

Connector types: 3.5 mm (stereo) plug or stripped & tinned lead

wires (Pigtail)

Cable Length: Standard is 5 m, though we have custom cable

lengths available upon request

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If sampling rate is greater than 0.1 Hz, the anemometer reports the speed
and direction at the time of sampling. If sampled less frequently, the anemome­ter samples every 10 seconds, averages the vector components of the wind, and
keeps the maximum gust. When the logger samples, the anemometer reports the
average wind speed, direction, and the maximum gust speed.

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