Decagon Devices ECH2O EA-10 Integrator Manual

ECH

Soil Moisture Sensor

O EA-10

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Integrator’s Guide

EA-10 Soil Moisture Sensor Integrator’s Guide

Contents

Contents

1. Introduction . . . . . . . . . . . . . . 1

Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1

Contact Information . . . . . . . . . . . . . . . . . . . . . . . . . 2

Warranty Information . . . . . . . . . . . . . . . . . . . . . . . . 2

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

2. Installing the EA-10. . . . . . . .4

Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4

Turf Installation . . . . . . . . . . . . . . . . . . . . . . . . . . 5

Electrical Connection . . . . . . . . . . . . . . . . . . . . . . . . 5

Extension Cables. . . . . . . . . . . . . . . . . . . . . . . . . 6

Hardware Requirements . . . . . . . . . . . . . . . . . . . . . . 6

Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

3. How the EA-10 Works . . . . . 8

Calibration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

Functional Testing . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

Further Reading . . . . . . . . . . . 10

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EA-10 Soil Moisture Sensor Integrator’s Guide

1. Introduction

1. Introduction

Thank you for using the ECH2O EA-10 Dielectric
Soil Moisture sensor. The EA-10 sensor has a stan­dard 2-wire, 4-20 mA analog interface for use with
industrial data acquisition and control systems. The
EA-10 has a very low power requirement and high res­olution. This gives you the ability to make as many
measurements as you want over a long period of time
(i.e. a growing season), with minimal battery usage.
This guide covers the basics of integrating the EA-10
into an existing ECH2O system.

Specifications

Model: ECH2O EA-10 Dielectric Soil Moisture
Sensor.

Electrical specs:
Interface: 4-20 mA, 2-wire analog transmitter

Red: (+) supply; White: (-) supply; Shield: NC
Supply voltage: line powered 7-32 Volt; DC
Overvoltage and reverse polarity protected

Sensor specs:

Measurement type: Volumetric Water Content (VWC)
Measurement range: typical 0 to 40 percent VWC
Measurement resolution: depends on acquisition hardware
Measurement accuracy: ± 2% with soil specific calibra-

tion; accuracy at standard factory calibration varies
depending on soil type

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EA-10 Soil Moisture Sensor Integrator’s Guide

1. Introduction

Measurement output: current linearly related to VWC.
Active sensor length: 10 cm
Minimum measurement time: 10 ms

Soils: all types; coarse sand to clay

Operating environment:

Temperature: -40 to +60 °C.
Humidity: 0-100%

Physical properties:

Dimensions: 14.5cm x 3.17cm x 0.15 cm
Cable: 3 m 26 AWG tinned, bare wire

Calibration:

Percent Volumetric Water Content = 4.25 x Current - 34.2.
Functional testing:

Sensor output in air: 4.3 - 4.9 mA

Sensor output in distilled water: 17.6 - 18.2 mA.

Contact Information

If you need to contact Decagon:

• E-mail us at [e-mail]

• Send us a fax at [phone]

• Call us at: (US and Canada only) 1-800-755-2751,

or 509-332-2756.

Warranty Information

The EA-10 has a 30-day satisfaction guarantee and a
one-year warranty.

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EA-10 Soil Moisture Sensor Integrator’s Guide

1. Introduction

Seller’s Liability

Seller warrants new equipment of its own manufacture
against defective workmanship and materials for a
period of one year from date of receipt of equipment
(the results of ordinary wear and tear, neglect, misuse,
accident and excessive deterioration due to corrosion
from any cause are not to be considered a defect); but
Seller’s liability for defective parts shall in no event
exceed the furnishing of replacement parts F.O.B. 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.

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