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Decagon Devices ECH2O EA-10, Integrator Manual

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Decagon Devices ECH2O EA-10 Integrator Manual Download Page 8

EA-10 Soil Moisture Sensor Integrator’s Guide

2. Installing the EA-10

6

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. Below is an EA-10 wiring diagram:

The red wire connects to the positive supply and the
white wire to the negative supply. The shield (bare

45°

1.0"

     (2.54 cm)

Analog out (Red)

Ground (Bare)

Excitation (White)

Sensor cable

                                                                                  ground level

Summary of Contents for ECH2O EA-10

Page 1: ...ECH2O EA 10 Soil Moisture Sensor Integrator s Guide ...

Page 2: ...tions 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 ...

Page 3: ...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 Volumetr...

Page 4: ...nsions 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 support decagon com Send us a fax at 509 332 5158 Call us at US and Canada only 1 800 755 2751 or 509 332 2...

Page 5: ...er 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 opera tion use misuse nonuse repair or replacement of said material and equipment or out o...

Page 6: ...robe it is best to maxi mize contact between the probe and the soil There are two methods to accomplish this 1 Use Decagon s Probe Installation Kit to install the probe This kit has a custom shaped blade to make the insertion in the soil then another tool to place the probe into the insertion For deeper installa tions use an augur to reach the desired depth then use the Installation kit with exten...

Page 7: ... the read ings Also do not install the probes adjacent to large metal objects such as metal poles or stakes This can attenuate the probe s electromagnetic field and adversely affect output readings Turf Installation When installing the EA 10 the installation procedure is almost the same except that the probe must be placed at a 45 angle to the ground instead of straight down Orientation The probe ...

Page 8: ...nsmitter When connected to a 7 32 volt source line power the cur rent is linearly proportional to the water content of the soil Below is an EA 10 wiring diagram The red wire connects to the positive supply and the white wire to the negative supply The shield bare 45 1 0 2 54 cm Analog out Red Ground Bare Excitation White Sensor cable ground level ...

Page 9: ... EA 10 For most applications we rec ommend sealing the connections from the elements to maintain a good connection and to prevent corrosion Decagon supples 2 conductor shielded cable and this is the best type to use if you supply your own cable Hardware Requirements The EA 10 is designed to work with industrial control and acquisition devices The EA 10 is loop powered drawing its operational power...

Page 10: ...netic emissions Troubleshooting If you encounter problems with the EA 10 they will usually be in the form of negative or erroneous VWC readings The most common solution to this problem is to make sure that you have adequate probe to soil contact When inserted the EA 10 should be com pletely covered up to the black overmolding Doing this should remedy any reading errors If it does not please contac...

Page 11: ...ol and locations with poor vegetative cover or where vegetation tends to water stress because of poor mois ture holding capacity of the soil or shallow root zone Vegetation in non monitored zones will use water at a rate proportional to water use in the monitored zone Water application rates in these zones must therefore be proportional for the entire system to remain prop erly irrigated If trees ...

Page 12: ...ric Water Content 0 0425 x Current 0 342 Water content is in m3 m 3 and current is in milli amps For water content in terms of percent of total volume use the following equation Volume percent 4 25 x Current 34 2 These calibrations are for typical soils with mid range texture and are accurate enough for most irrigation scheduling purposes For greater accuracy a soil spe cific calibration should be...

Page 13: ...ther Reading ECH2O Probes Soil Specific Calibration http www decagon com appnotes echocal pdf ECH2O Dielectric Probes vs Time Domain Reflectometers TDR http www decagon com appnotes echovstdr pdf ECH2O Probe insertion guide http www decagon com appnotesprobeinsert2 pdf ...

Page 14: ...de Index 11 Index C calibration 9 contact information 2 E e mail address 2 F functional testing 9 I installation electrical connection 5 hardware requirements 6 procedure 4 S seller s liability 2 specifications 1 T troubleshooting 7 W warranty 2 ...

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