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GS3

CONTENTS

Contents

Introduction

1.1

Customer Support . . . . . . . . . . . . . . . . . . . .

1.2

Specifications . . . . . . . . . . . . . . . . . . . . . . .

1.3

Warranty . . . . . . . . . . . . . . . . . . . . . . . . .

Theory

2.1

Volumetric Water Content . . . . . . . . . . . . . . . .

2.2

Temperature

. . . . . . . . . . . . . . . . . . . . . . .

2.3

Electrical Conductivity . . . . . . . . . . . . . . . . . .

2.4

Converting Bulk EC to Pore EC

. . . . . . . . . . . .

2.5

Pore Water vs. Solution EC . . . . . . . . . . . . . . .

2.6

Reference . . . . . . . . . . . . . . . . . . . . . . . . .

Calibration

Connecting Sensors

4.1

Connecting to an Em50/Em50R logger . . . . . . . . .

4.2

3.5mm Stereo Plug Wiring . . . . . . . . . . . . . . . .

4.3

Connecting to a Non-Decagon Logger

. . . . . . . . .

Communication

5.1

Serial Communication . . . . . . . . . . . . . . . . . .

5.2

SDI-12 Communication

. . . . . . . . . . . . . . . . .

5.3

Sensor Bus

. . . . . . . . . . . . . . . . . . . . . . . .

5.4

Address . . . . . . . . . . . . . . . . . . . . . . . . . .

5.5

Power . . . . . . . . . . . . . . . . . . . . . . . . . . .

5.6

Reading . . . . . . . . . . . . . . . . . . . . . . . . . .

5.7

Campbell Scientific Programs . . . . . . . . . . . . . .

Installing the Sensors

6.1

Orientation . . . . . . . . . . . . . . . . . . . . . . . .

6.2

Removing the Sensors . . . . . . . . . . . . . . . . . .

6.3

Cleaning the Probes . . . . . . . . . . . . . . . . . . .

Troubleshooting

Declaration of Conformity

iii

Содержание GS3

Страница 1: ...Operator s Manual Decagon Devices Inc Version December 1 2014 11 53 59 ...

Страница 2: ...es Inc 2365 NE Hopkins Court Pullman WA 99163 Phone 509 332 5600 Fax 509 332 5158 Website www decagon com Email support decagon com or sales decagon com Trademarks c 2011 2014 Decagon Devices Inc All Rights Reserved ii ...

Страница 3: ...bration 9 4 Connecting Sensors 10 4 1 Connecting to an Em50 Em50R logger 10 4 2 3 5mm Stereo Plug Wiring 10 4 3 Connecting to a Non Decagon Logger 11 5 Communication 13 5 1 Serial Communication 13 5 2 SDI 12 Communication 13 5 3 Sensor Bus 15 5 4 Address 15 5 5 Power 16 5 6 Reading 16 5 7 Campbell Scientific Programs 17 6 Installing the Sensors 18 6 1 Orientation 18 6 2 Removing the Sensors 19 6 3...

Страница 4: ...s you through the sensor features and how to use it successfully 1 1 Customer Support If you ever need assistance with your GS3 or if you just have ques tions or feedback there are several ways to contact us Customer ser vice representatives are available to speak with you Monday through Friday between 7am and 5pm Pacific time Note If you purchased your GS3 through a distributor please con tact th...

Страница 5: ...o 80 0 002 m3 m3 0 2 VWC from 0 to 40 VWC 0 001 m3 m3 0 1 VWC 40 VWC Range Apparent dielectric permittivity εa 1 air to 80 water Bulk Electrical Conductivity Accuracy 5 from 0 to 5 dS m 10 from 5 to 23 dS m user calibration required above 10 dS m Resolution 0 001 dS m from 0 to 23 dS m Range 0 to 25 dS m bulk Temperature Accuracy 1 C Resolution 0 1 C Range 40 to 60 C General Specifications Dimensi...

Страница 6: ...vent 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 ...

Страница 7: ...1 INTRODUCTION GS3 the implied warranties of merchantability and fitness for a particular purpose not expressly set forth herein 4 ...

Страница 8: ...ted underneath the sensor overmold next to one of the prongs so it remains in thermal equilibrium with the medium and reads the temperature of the prong surface The GS3 outputs temperature in C unless otherwise stated in your preferences file in either the DataTrac 3 or ECH2O Utility programs It is important to note that even though the sensor head is white if it is in direct sunshine the temperat...

Страница 9: ...l if you plan to measure the EC of salty soils 2 4 Converting Bulk EC to Pore EC For many applications it is advantageous to know the electrical con ductivity of the solution contained in the soil pores σp which is a good indicator of the solute concentration in the soil Tradition ally σp has been obtained by extracting pore water from the soil and measuring σp directly As one would expect this is...

Страница 10: ...le and easy method for determining for individ ual soil types which will improve the accuracy of the calculation of σp in most cases Our testing indicates that the above method for calculating σp results in good accuracy 20 in moist soils and other growth media In dry soils where VWC is less than about 0 10 m3 m3 the denomi nator of equation 1 becomes very small leading to large potential errors W...

Страница 11: ... We can calculate the solution EC as follows φ 1 ρb ρs 1 1 5 2 65 0 43 3 Solution EC σpΘ σd φ Θ φ 0 7 0 1 0 0 43 0 162 dS m 4 In this example φ is the porosity ρb is bulk density ρs density of the minerals assumed to be 2 65 Mg m3 subscript d is distilled water and Θ is volumetric water content We assume that the EC of the distilled water is 0 dS m In practice solution EC calculated from this meth...

Страница 12: ... accuracy you can perform a media specific calibration to get the accuracy down to 1 to 2 It is interesting to note that the main difference between the calibrations is caused by the high air volume in the organic soils that lowers the starting dry media dielectric of the sensor For more information on how to calibrate your probes please see http www decagon com support Decagon also has a calibrat...

Страница 13: ...nstall ECH2O Utility DataTrac 3 or a terminalport program on your com puter The following software support the GS3 sensor Em50 Firmware version 2 05 ECH2O Utility 1 62 or greater DataTrac 3 3 or greater Please check your software version to ensure it will support the GS3 To update your software to the latest versions please visit Decagon s support site at http www decagon com support To use the GS...

Страница 14: ...on wiring Our integrator s guide gives detailed instructions on connecting the GS3 sensor to non Decagon loggers Please visit www decagon com support for the complete integrator s guide Figure 2 Pigtail Wiring GS3 sensors with the stripped and tinned cable option can be made with custom cable lengths up to 1000 ft on a per foot fee basis This option gets around the need for splicing wire a possibl...

Страница 15: ...ge of creating a direct connection with no chance of the sensor becoming un plugged however it then cannot be eas ily used in the future with a Decagon readout unit or data logger The other option is to obtain an adapter cable from Decagon The 3 wire sensor adapter cable has a connector for the sensor jack on one end and three wires on the other end for connection to a data logger this type of wir...

Страница 16: ...rial out is 1200 baud asynchronous with 8 data bits no parity and one stop bit The voltage levels are 0 to 3 6 V and the logic levels are TTL active low The power must be removed and reapplied for a new set of values to be transmitted The ASCII stream contains three numbers separated by spaces The stream is terminated with the carriage return character The first number is the dielectric permittivi...

Страница 17: ... accessed in the Config menu by selecting SDI 12 Address and pressing Enter To change the SDI 12 ad dress press the up and down arrows until you see the desired address and push Enter SDI 12 communication allows many parameters to be communicated at once so you can also see things like the sen sor model SDI 12 version etc SDI 12 communication is also sup ported in Campbell Scientific data loggers ...

Страница 18: ... addressed specifically to each sensor For example when a reading is needed the host will first address the specific sensor that needs to make a measurement tell it to make a measurement then tell it to send its answer back to the host Please note that because the supply wire is in common with all sensors a problem with a single sensor can be catastrophic to the bus system A short circuit on one s...

Страница 19: ...nsor From the standard sensor readings dielectric temperature and EC to calibration coefficients several parameters can be stored in the sensor and read back For typical use all that is needed is a simple output of dielectric temper ature and EC The sequence to gather those values is quite simple Address the sensor tell it what you want it to do end with a For example 0R0 Address sensor 0 take an ...

Страница 20: ...og straightforward Simply choose the SDI 12 Recorder command and input the necessary parameters As mentioned earlier the sensor outputs three values so be sure to define your array size as 3 in CRBasic i e Public GS3Out 3 or leave room for two more parameters after your Loc call in Edlog Example programs can be found at www decagon com support 17 ...

Страница 21: ...the top of a pot that is being irrigated by micro sprinkler may cause water to drip around the sensor head leaving a dry patch of soil immediately below A better option would be to insert the sensor into the side of the root mass with the needles horizontal aligned in a vertical row This allows water to flow freely through the pot and measure ments to be made directly around the roots Still when i...

Страница 22: ...heir cables as this can put immense strain on the wires inside If the sensor is buried carefully dig down to the sensor taking care not to damaging the cable with your digging implement After removing the media around the head simply grab onto the sensor and remove it 6 3 Cleaning the Probes Clean each pin using a mild detergent such as liquid dish soap and a non abrasive sponge or cloth Note Avoi...

Страница 23: ...6 INSTALLING THE SENSORS GS3 Note Be sure not to touch the prongs with an un gloved hand or contact them with any source of oil or other non conducting residue 20 ...

Страница 24: ...g to ensure White is 12 V supply Red is digital out and Bare is ground 2 PROBLEM Sensor reading too low SOLUTION Check for air gaps around sensor needles These could be produced below the surface of the substrate when the needle contacts a large piece of material and pushes them out of the way Ensure the calibration equation you are using is appropriate for your media type There are significant di...

Страница 25: ...dur ing sensor installation Higher density can cause sensor reading to be elevated Ensure the calibration equation you are using is appropriate for your media type There are significant differences between substrate calibrations so be sure to use the one specific to your substrate 22 ...

Страница 26: ... WA 99163 USA Type of Equipment Dielectric Soil Moisture Sensor Model Number GS3 Year of First Manufacture 2011 This is to certify that the GS3 greenhouse sensor manufactured by Decagon Devices Inc a corporation based in Pullman Washington USA meets or exceeds the standards for CE compliance as per the Council Directives noted above All instruments are built at the factory at Decagon and pertinent...

Страница 27: ... Dielectric Permittivity 5 7 Electrical Conductivity 5 Email 1 Fax ii 1 Installation Orientation 18 Removal 19 Loggers CSI 17 Non Decagon 11 Phone ii 1 Pore Water EC 7 Power Requirements 2 Seller s Liability 3 Sensor Accuracy 2 Range 2 Resolution 2 Specifications 2 Solution EC 7 Troubleshooting 21 Volumetric Water Content 2 Warranty 3 Wiring Pigtail 11 Stereo Plug 10 24 ...

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