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Decagon Devices ECH2O EA-10 Integrator Manual

Soil moisture sensor
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ECH
O EA-10
2
Soil Moisture Sensor
Integrator's Guide

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Summary of Contents for Decagon Devices ECH2O EA-10

  • Page 1 O EA-10 Soil Moisture Sensor Integrator’s Guide...

  • Page 2: Table Of Contents

    EA-10 Soil Moisture Sensor Integrator’s Guide Contents Contents 1. Introduction ....1 Specifications ....... 1 Contact Information .

  • Page 3: Introduction

    EA-10 Soil Moisture Sensor Integrator’s Guide 1. Introduction 1. Introduction Thank you for using the ECH O EA-10 Dielectric Soil Moisture sensor. The EA-10 sensor has a stan- dard 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 res- olution.

  • Page 4: Contact Information

    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...

  • Page 5: Seller's Liability

    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);...

  • Page 6: Installing The Ea-10

    EA-10 Soil Moisture Sensor Integrator’s Guide 2. Installing the EA-10 2. Installing the EA-10 The EA-10 monitors the water content of the soil in which it is placed by measuring the dielectric constant of the soil and water surrounding the probe. While the probe measures just the soil which is adjacent to it, its reading is most useful if that measurement represents the general soil conditions in which the probe is...

  • Page 7: Turf Installation

    EA-10 Soil Moisture Sensor Integrator’s Guide 2. Installing the EA-10 between the probe and the soil. For deeper instal- lation, excavate down to the level you wish to mea- sure, then install the probe as described. When selecting a site for installation, it is important to remember that the soil adjacent to the probe surface has the strongest influence on the probe reading and that the probe measures the volumetric water content.

  • Page 8: Electrical Connection

    EA-10 Soil Moisture Sensor Integrator’s Guide 2. Installing the EA-10 ground level 1.0" (2.54 cm) 45° EA-10 turf placement Electrical Connection The EA-10 is a 2 wire, 4 - 20 mA transmitter. When connected to a 7 - 32 volt source (line power), the cur- rent is linearly proportional to the water content of the soil.

  • Page 9: Extension Cables

    EA-10 Soil Moisture Sensor Integrator’s Guide 2. Installing the EA-10 wire) can be connected to a shield terminal, if avail- able, or left open. The probe is electrically floating, and the shield is not electrically connected to the probe circuitry. Extension wire can be used to connect the EA-10 to the 4-20 mA receiver.

  • Page 10: Troubleshooting

    EA-10 Soil Moisture Sensor Integrator’s Guide 2. Installing the EA-10 provide a short pulse, leaving the probes turned off most of the time. Continuous power may cause the probe to exceed government FCC limits on electromagnetic emissions. Troubleshooting If you encounter problems with the EA-10, they will usually be in the form of negative or erroneous VWC readings.

  • Page 11: How The Ea-10 Works

    EA-10 Soil Moisture Sensor Integrator’s Guide 3. How the EA-10 Works 3. How the EA-10 Works In essence, the EA-10 monitors the water budget of the soil in which it is placed. It senses water addition and water loss. If the soil is too wet, irrigation can be stopped.

  • Page 12: Calibration

    EA-10 Soil Moisture Sensor Integrator’s Guide 3. How the EA-10 Works (no air gaps). The soil must therefore be packed tightly around the entire probe length during installation. The probe is installed with the blade perpendicular to the surface to interfere as little as possible with water movement through the soil.

  • Page 13: Further Reading

    EA-10 Soil Moisture Sensor Integrator’s Guide Further Reading Further Reading O Probes Soil-Specific Calibration http://www.decagon.com/appnotes/echocal.pdf O Dielectric Probes vs. Time Domain Reflectometers (TDR) http://www.decagon.com/appnotes/echovstdr.pdf O Probe insertion guide http://www.decagon.com/appnotesprobeinsert2.pdf...
  • Page 14 EA-10 Soil Moisture Sensor Integrator’s Guide Index Index calibration 9 contact information 2 e-mail address 2 functional testing 9 installation electrical connection 5 hardware requirements 6 procedure 4 seller’s liability 2 specifications 1 troubleshooting 7 warranty 2...

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