User's Manual
Contents
1. 0 000936mv 0 376 where 9 is the volumetric water content and mv is the millivolt output of the ECHO probe NOTE This calibration constant is only for use with a 2500mV excitation Use of this number with any other excitation voltage will result in erro neous readings Troubleshooting If you encounter problems with the ECHO probe they most likely will manifest themselves in the form of incorrect or erroneous readings Before contacting Decagon about the sensor do the follow ing e Check to make sure the connections to the data logger are both correct and secure e Ensure that your datalogger s batteries are not dead or weakened If you encounter problems that aren t due to the datalogger please contact Decagon at 509 332 2756 and at echo decagon com 14 ECHO User s M anual Declarationof Conformity Declaration of Conformity Application of Council 89 336 EEC Directive Standards to which EN61326 1998 conformity is declared EN55022 1998 Manufacturer s Name Decagon Devices Inc 950 NE Nelson Court Pullman WA 99163 USA Type of Equipment ECHO dielectric soil moisture probe Model Number EC 10 EC 20 Year of First Manufacture 2001 This is to certify that the ECHO dielectric soil mois ture probe 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 inst2. 2500 mV Slow Range SE Channel Excite all reps w Exchan 1 Delay units 0 01 sec 500 mV Excitation Loc Probe mV 0 0695 Mult 29 0 Offset DOYAUNUNSWNH HNREH RUN Sets zero as lower limit for water content reading 3 Beginning of Loop P87 1 0 Delay Br 22 Loop Count 4 TE X lt gt F P89 lag dL X Loc Probe mV 2 4 lt 3 0 0 F 4 30 Then Do 5 Z F P30 1 0 F 2 0 Exponent of 10 Boe ak Z Loc Probe mV 6 End P95 Converts percent to m3 m3 water content 7 Z X F P37 12 ECHO User s M anual Collecting Data 1 1 X Loc Probe mV 2 01 E 3 3 Z Loc Probe WC 8 End P95 Stores reading in final storage location 9 Do P86 1 10 Set Output Flag High Flag 0 10 Sample P70 1 2 Reps aa Loc Probe WC 11 Do P86 1 20 Set Output Flag Low Flag 0 12 End P95 Table 2 Program 02 0 0000 Execution Interval seconds Table 3 Subroutines End Program Calibration The ECHO probes come pre calibrated for most soil types If however your soil type has high sand or salt content the standard calibration will not be accurate In such cases you can perform specific calibrations for your individual soil types The standard calibration for the standard 25cm length EC 20 ECHO probes with a 2500mV excitation is 13 ECHO User s M anual Collecting Data 0 m3 M3 0 000695mv 0 29 and for the shorter ECHO 10 probes is 6 m3 m3
3. ECHO Dielectric Aquameter User s Manual For Models EC 20 and EC 10 Version 1 4 Decagon Devices Inc 2002 Decagon Devices Inc All rights reserved Decagon Devices Inc 950 NE Nelson Court P O Box 835 Pullman WA 99163 ECH O User s M anual C onte nts Contents L Introduction AA AA 1 Welcome aa banka PANG EU 1 ECHO Specifications 3G Daga detainees 1 Contact Information nanaga akanba Kaka 2 W arranty Int Orig Oat ay care wa eee 2 Seller Ss Labi kah ada aad 2 2 31 NE ECHO Sensor aanak cee es 4 About the ECHO 45 3 acne Kaha Baa kan sens 4 Features aaa cone eva SU el Shey Racy 5 W iring Digg LAMG waa AA ae es 5 3 5mm plug wiring secon eevee ins wees 5 Adapter cable Wiring cc eeeae 6 3 Installing the Probe 7 Procedure yeca ra a a AA 7 DAMENG 4 sic scart ka a E ENA 8 Removing the Probe aaa eh nanha aliens 8 4 Collecting Data gaan tees euertess 9 Datalogger Requirements 9 Connecting to a Datalogger 10 Sample Program ot can dud Ahaha KG ka 10 Ga NN NA at ca a ade od ogre dt aware B Troubleshooting osc Mite bA wan 14 Declaration of Conformity 15 ECH O User s M anual Contents ECHO User s M anual Introduction L Introduction ee Welcome Welcome to the ECHO Dielectric Aquameter sensor for measuring soil water content This innovative sensor will enable you to monitor soil moisture accurately and affordably ECHO
4. Specifications Measurement Time 10ms milliseconds Accuracy e Typically 03 m m 3 e With soil specific calibration 01 m m 1 Resolution 0 002m3 m 0 1 Power e Requirements 2 5VDC 2mA to 5VDC 7mA e Output 10 40 of excitation voltage 250 1000mV at 2500mV excitation Operating Environment 0 to 50 C Range of Measurement 0 to saturated volumetric water content Probe dimensions model EC 20 25 4cm x 3 17cm x 15cm model EC 10 14 5cm x 3 17cm x 15cm Cable length 10ft standard extension cable avail able Connector type 3 5 mm plug Datalogger Compatibility not exclusive ECHO User s M anual Introduction e Decagon Em5 Em5R e Campbell Scientific CR10 CR10X 21X 23X Contact Information To contact Decagon for customer support or ques tions e Email us at echo decagon com e Send us a fax at 509 332 5158 e Call us at 1 800 755 2751 US and Canada only or 509 332 2756 Warranty Information The ECHO has a 30 day satisfaction guarantee and a one year warranty Seller s Liability Seller warrants new equipment of its own manufac ture 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 deteriora tion due to corrosion from any cause are not to be considered a defect but Seller s liability for defec tive parts shall in no e
5. l adjacent to the probe sur face has the strongest influence on the probe read ing and that the probe measures the volumetric water content Therefore any air gaps or excessive soil compaction around the probe can profoundly influence the readings Also do not install the probes adjacent to large metal objects such as metal poles or stakes This can attenuate the probe s elec tromagnetic field and adversely affect output read ings Procedure To install the ECHO probe use a thin implement like a trenching shovel gardening spade or flat bar to make a pilot hole in the soil Then insert the probe into the hole making sure the entire length of the probe is covered Finally insert the shovel again into the soil a few inches away from the probe and gently force soil toward the probe to provide good contact between the probe and the soil For deeper installation excavate down to the level you wish to measure then install the probe ECHO User s M anual Installing the Probe O rientation The probe can be oriented in any direction How ever orienting the flat side perpendicular to the sur face of the soil will minimize effects on downward water movement Removing the Probe When removing the probe from the soil do not pull it out of the soil by the cable Doing so may break internal connections and make the probe unusable ECHO User s M anual Collecting Data 4 Collecting Data Datalogger Requiremen
6. probe has a very low power requirement and high resolution This gives you the ability to make as many measurements as you want even hourly over a long period of time like a growing season for example with minimal battery usage ECHO User s M anual The ECHO Sensor Features Circuitry Sensor o Fig 1 ECHO probe diagram Wiring Diagrams 3 5 mm plug wiring The ECHO probe comes with a 3 5mm stereo plug style connector This allows for rapid connection directly to Decagon s Em5 or ECHO Check Below ECHO User s M anual The ECHO Sensor is a diagram showing the wiring configuration for this connector Analog q E II Ground Excitation Fig 2 ECHO plug wiring configuration Adapter cable w iring The ECHO adapter cable for connection to non Decagon equipment contains 3 wires as shown below The cable plug has integrated inductors designed to provide signal noise reduction Analog out Red Adapter cable Ground Bare Excitation White Fig 3 Adapter cable wiring configuration NOTE Be aware that cutting off the cable plug or cutting the cable in any other way will void your warranty since the plug and cable are both specially engineered for optimal perfor mance and noise reduction ECHO User s M anual Installing the Pro be 3 Installing the Probe SCS When selecting a site for installation it is important to remember that the soi
7. ruments are built at the factory at Decagon and pertinent testing documentation is freely available for verification 15 ECHO User s M anual Declaration of C onformity 16
8. ts The ECHO sensors are designed to work most effi ciently with Decagon s 5 channel Em5 or our ECHO Check handheld readout They can however be adapted for use with other dataloggers such as those from Campbell Scientific Inc for example The ECHO requires an excitation voltage in the range of 2 to 5 volts It produces an output voltage that depends on the dielectric constant of the medium surrounding the probe and ranges between 10 and 50 of the excitation voltage Any datalogger which can produce a 2 5 to 5V excitation with approximately 10 millisecond duration and read a volt level signal with 12 bit or better resolu tion should be compatible with the ECHO probes The current requirement at 2 5V is around 2mA and at 5V it is 7 8mA Important Note ECHO probes are intended only for use with dataloggers 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 cer tain circumstances cause the probe to exceed gov ernment specified limits on electromagnetic emissions ECHO User s M anual Collecting Data NOTE All Decagon readout devices use 2 5V exci tation so the remainder of the discussion assumes this as the excitation If other voltages are used adjustments to the calibration equations provided will be needed Connecting to a Datalogger Connect the wires to the datalogger as shown
9. vent exceed the furnishing of replacement parts F O B the factory where origi nally manufactured Material and equipment cov ered hereby which is not manufactured by Seller shall be covered only by the warranty of its manu facturer 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 prof ECHO User s M anual Introduction its occasioned by or arising out of the installation operation use misuse nonuse repair or replace ment 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 repre sentations or warranties of any kind express implied statutory or otherwise including but with out limitation the implied warranties of merchant ability and fitness for a particular purpose not expressly set forth herein ECHO User s M anual The ECHO Sensor 2 The ECHO Sensor li allllrpvp FT About the ECHO The Echo probe measures the dielectric constant of the soil in order to find its volumetric water content Since the dielectric constant of water is much higher than that of air or soil minerals the dielectric con stant of the soil is a sensitive measure of water con tent The ECHO
10. with the supply wire connected to the excitation the analog out wire to an analog input and the bare ground wire to ground Analog t n Supply ou Ground Datalogger Fig 5 Datalogger configuration Sample Program The following program is an example that can be used with Campbell Scientific s CR10X datalogger and our ECHO probes at a 2500mv excitation Note Multiplier and offset in instruction 2 P4 convert mV reading to water content Instruction 7 P37 converts volumetric water content to m3 m3 Also such as the one in Instruction 4 10 ECHO User s M anual Collecting Data P89 line 1 increment the input location for the next time through the loop A is applied to the input location by clicking on the input location and typing the letter c CR10X ECH20 Datalogger Program for CR10X Wiring White Excitation Channel 1 Red Input Single Ended Channel 1 Black Ground Table 1 Program 01 1 Execution Interval seconds Excites and reads two probes once per hour 1 If time is P92 1 0 Minutes Seconds into a 2 60 Interval same units as above 3 30 Then Do Multiplier and offset Convert mV reading to percent water content with factory calibration y 6 95E 04 X 2 90E 01 7 for ECHO 10 short probes use i y 9 36E 04 x 3 76E 01 2 Excite Delay SE P4 11 ECHO User s M anual Collecting Data Reps
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