Decagon Devices Dielectric Leaf Wetness Sensor Betriebsanleitung

Operator’s Manual

Decagon Devices, Inc.

Version: February 29, 2016 — 11:10:55

LWS

Decagon Devices, Inc.

2365 NE Hopkins Court

Pullman WA 99163

Phone: 509-332-5600

Fax: 509-332-5158

Website: www.decagon.com

Email: supp[email protected] or [email protected]

Trademarks:

“ECH2O” is a registered trademark of Decagon Devices, Inc.

2007-2014 Decagon Devices, Inc.

LWS 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

2 About the Leaf Wetness Sensor 3

2.1 Speciﬁcations ....................... 3

3 Collecting Data 5

3.1 Installing the Sensor . . . . . . . . . . . . . . . . . . . 5

3.2 Data Logger Requirements . . . . . . . . . . . . . . . . 6

3.3 Adapter Cable Wiring . . . . . . . . . . . . . . . . . . 6

3.4 Extending the Sensor Leads . . . . . . . . . . . . . . . 7

3.5 UVProtection ...................... 7

4 Interpreting Data 8

4.1 Understanding Data from the Em50 . . . . . . . . . . 9

4.1.1 Processed Data File . . . . . . . . . . . . . . . 9

4.1.2 Unprocessed Data File . . . . . . . . . . . . . . 10

4.1.3 DataTrac3 File . . . . . . . . . . . . . . . . . . 11

4.2 Understanding Data from Other Data Loggers . . . . 11

5 LWS Theory 12

5.1 How the LWS Works . . . . . . . . . . . . . . . . . . . 12

5.2 How the LWS Mimics a Real Leaf . . . . . . . . . . . 12

6 Appendix A: Sample CSI Program 14

7 Declaration of Conformity 16

iii

LWS 1 INTRODUCTION

1 Introduction

Thank you for choosing Decagon’s Dielectric Leaf Wetness Sensor.

We designed this sensor to accurately and aﬀordable measure the

duration of leaf-surface wetness. This manual should help you un-

derstand the sensor features and how to use it successfully.

1.1 Customer Support

There are several ways to contact Decagon if you ever need assis-

tance with your product, have any questions, or feedback. 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 sensor through a distributor, please con-

tact them for assistance.

Email:

supp[email protected] or [email protected]

Phone:

509-332-5600

Fax:

509-332-5158

If contacting us by email or fax, please include as part of your mes-

sage 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 sensor to ensure

that it performs to its full potential.

1 INTRODUCTION LWS

1.3 Warranty

The Dielectric Leaf Wetness Sensor has a 30-day satisfaction guar-

antee and a one-year warranty on parts and labor. Your warranty is

automatically validated upon receipt of the instrument.

Note: The one year service plan activates when Decagon ships the

instrument and not at the time of software installation.

1.4 Seller’s Liability

Seller warrants new equipment of its own manufacture against de-

fective 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 instal-

lation, 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 con-

stitutes 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 with-

out limitation, the implied warranties of merchantability and ﬁtness

for a particular purpose), not expressly set forth herein.

LWS 2 ABOUT THE LEAF WETNESS SENSOR

2 About the Leaf Wetness Sensor

The LWS measures leaf surface wetness by measuring the dielectric

constant of the sensor’s upper surface (see Section 5 for a more thor-

ough explanation). It has a very low power requirement, which gives

you the ability to make as many measurements as you want over a

long period of time (such as a growing season) with minimal bat-

tery usage. This sensor also has very high resolution, which gives

you the ability to detect very small amounts of water (or ice) on the

sensor surface. Water on the sensor surface does not need to bridge

electrical traces to be detected, as is common with resistance based

surface wetness sensors. This means that the LWS does not need

to be painted before use, which eliminates the need for individual

sensor calibration.

2.1 Speciﬁcations

Measurement Time: 10 ms

Power: 2.5 VDC @ 2 mA to 5 VDC @ 7 mA

Output: 320 to 1000 mV @ 3 V excitation

Operating Environment: -20 to 60 ◦C

Probe Dimensions: 11.2 cm x 5.8 cm x .075 cm

Cable Length: 5 m standard, extension cables are available

Connector Type: 3.5 mm plug or optional “pigtail” adapter (stripped

and tinned lead wires)

Data Logger Compatibility (not exclusive):

Decagon: Em50, Em50R

Campbell Scientiﬁc: CR10, 10X, 21X, 23X, 1000, 3000, 5000

2 ABOUT THE LEAF WETNESS SENSOR LWS

Figure 1: The Leaf Wetness Sensor

LWS 3 COLLECTING DATA

3 Collecting Data

3.1 Installing the Sensor

The LWS is designed to be deployed either in the canopy or on

weather station masts. There are two holes in the non-sensing por-

tion of the sensor body for mounting. The holes can be used with

either zip ties or with 4-40 bolts.

Figure 2: Top View of Installed LWS in Plant Canopy

3 COLLECTING DATA LWS

3.2 Data Logger Requirements

The LWS works with Decagon’s 5-channel Em50 or Em50R data log-

gers. It can also be adapted for use with other data loggers, such as

those from Campbell Scientiﬁc, Inc. (See Appendix A for a sample

program.) The sensor requires an excitation voltage in the range of

2.5 to 5 volts.

It produces an output voltage that depends on the dielectric con-

stant of the medium surrounding the probe, and ranges between 10

to 50% of the excitation voltage. Any data logger which can produce

a 2.5 to 5 V excitation with approximately 10 millisecond duration

and read a volt level signal with 12-bit or better resolution should

be compatible with the LWS. The current requirement at 2.5 V is

around 2 mA, and a 5 V it is 7 to 8 mA.

Note: The LWS is intended only for use with data loggers and readout

devices which can provide short excitation pulses, leaving the probes

turned oﬀ most of the time. Continuous excitation not only wastes

battery power, but may, under certain circumstances, cause the probe

to exceed government speciﬁed limits on electromagnetic emissions.

3.3 Adapter Cable Wiring

If you use a non-Decagon data logger, clip the stereo plug oﬀ and

connect the lead wires directly to the chosen logger. The wiring con-

ﬁguration is shown below.

White = Power 2.5 to 5 V excitation

Bare shield = Ground

Red = Sensor data output (single ended)

LWS 3 COLLECTING DATA

Figure 3: Sensor wiring diagram

3.4 Extending the Sensor Leads

Extension cables for the LWS are available from Decagon in 10 and

50 foot (3 and 15 meter) lengths. The leads can be extended up to

250 feet without signal attenuation.

When using these extension cables in an unprotected environment,

the junctions between cables must be waterproofed. This can be ef-

fectively accomplished by connecting the junction, applying silicone

sealant to the junction, and shrinking appropriately sized heat-shrink

tubing over the still wet silicone sealant.

3.5 UV Protection

The LWS leaf wetness sensor is designed to withstand typical out-

door radiation and precipitation loads for greater than two years. If

you are using the LWS in areas with non-typical (unusually high) ra-

diation loads, we recommend additional applications of McNett UV

Tech (available from http://www.mcnett.com) be reapplied every 45

days. McNett is the only tested and approved UV blocking system

for Decagon’s Leaf Wetness Sensor.

To apply McNett UV Tech:

1. Wipe sensor clean.

2. Spray sensor surface with McNett UV Tech.

3. Rub with soft cloth until dry.

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