Decagon 10HS Operator's Manual
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Decagon 10HS Operator's Manual

Soil moisture sensor
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10HS
Soil Moisture Sensor
Operator's
Manual
Version 3

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Summary of Contents for Decagon 10HS

  • Page 1 10HS Soil Moisture Sensor Operator’s Manual Version 3...
  • Page 2 Decagon Devices, Inc. 2365 NE Hopkins Court Pullman WA 99163 (509) 332-2756 fax: (509) 332-5158 www.decagon.com Trademarks 10HS is a registered trademark of Decagon Devices, Inc. ©2008-2010 Decagon Devices, Inc.

  • Page 3: Table Of Contents

    1. Introduction ..........1 Specifications ............1 Customer Support ........... 2 Warranty Information ..........3 Seller’s Liability ............3 2. About the 10HS ...........4 Background Info ............4 3. Theory ............5 4. Installing the Sensor ........6 5. Collecting Data ..........8 Data logger Requirements ........8 6.

  • Page 5: Introduction

    10HS--Soil Moisture Sensor 1. Introduction 1. Introduction Thank you for choosing the 10HS soil water content sensor. This in- novative sensor will enable you to monitor volumetric water content of soil accurately and affordably. This manual is designed to help you understand the sensor’s features and how to use this device success-...

  • Page 6: Customer Support

    12 bit or better resolution Customer Support If you ever need assistance with your 10HS, or if you just have questions or feedback, there are several ways to contact us: NOTE: If you purchased your 10HS through a distributor, please contact them for assistance.

  • Page 7: Warranty Information

    10HS--Soil Moisture Sensor 1. Introduction 1-509-332-5158 Warranty Information The 10HS sensors have a 30-day satisfaction guarantee and a one year warranty. Seller’s Liability Seller warrants new equipment of its own manufacture against de- fective workmanship and materials for a period of one year from...

  • Page 8: About The 10Hs

    •Large sensing (1100 cubic centimeters)allowing you to have a more representative measurement of soil VWC The 10HS sensor runs at the same oscillator frequency that has given the EC-5 exceptional performance in soils (Kizito et.al, 2008, Bogena et. al, 2007). We recommend the 10HS sensor for mineral soil applications where soil heterogeneity is a concern.

  • Page 9: Theory

    10HS--Soil Moisture Sensor 3. Theory 3. Theory The 10HS sensor measures the volumetric water content of the soil using a capacitance technique. By rapidly charg- ing and discharging a positive and ground electrode (capaci- tor) in the soil, an electromagnetic field is generated whose charge time (t) is related to the capacitance (C) of the soil by ...

  • Page 10: Installing The Sensor

    5 cm of the soil surface, or the sensing volume of the electromagnetic field can extend out of the soil and reduce accuracy. Because the 10HS has gaps be- tween its prongs, it is also important to consider the particle size of the medium you are inserting the sensor into.
  • Page 11 – be careful with the sharp tips! Backfill the trench taking care to pack the soil back to natural bulk density around the black plastic portion of the 10HS. Method 2. Vertical Installation: Auger a 4 inch hole to the depth at which the sensor is to be installed.

  • Page 12: Collecting Data

    They can, however, be adapted for use with other data loggers, such as those from Campbell Scientific, Inc., for example. The 10HS requires an excitation voltage in the range of 3 to 15V. It produces an output voltage that is related to the volumetric water content of the soil in which it is buried, and ranges be- tween approximately 0.3 to 1.25V.
  • Page 13 Sensor cable Excitation (White) 10HS sensors with the stripped and tinned cable option can be made with custom cable lengths (up to 250 ft) on a per-foot fee basis. This option gets around the need for splicing wire (a pos-...
  • Page 14 Datalogger Note: The acceptable range of excitation voltages is from 3-15VDC. If you wish to read the 10HS with Campbell Scientific data loggers, you will need to power the sensors off of the switched 12V port rather than the excitation port.

  • Page 15: Calibration

    Mineral Soil Calibration For convenience, Decagon has also developed a standard calibra- tion equation for mineral soils to be used with the 10HS. With this standard calibration equation and careful sensor installation, accuracy of better than ±3% VWC (0.03 m ) is possible with most mineral soils.
  • Page 16 (> 10 dS/m solution EC). In these soils, it may be necessary to calibrate the 10HS to your specific soil type. With a soil-specific calibra- tion, the accuracy of the VWC measurement will be improved to 1-2% in any soil or other porous medium.

  • Page 17: Sample Programs

    The second program is for a CR10X data logger, but can be easily adapted to other “Edlog” type loggers. Note that the 10HS needs 3-15 V DC excitation, and therefore cannot be excited with the 2.5 V excitation port of many Campbell Scien- tific data loggers.
  • Page 18 ;Jumper from C1 to SW 12V CTRL - C1 is used to turn on the switched 12V port ;10HS white - excitaiton - SW 12V ;10HS red - Vout - SE CH1 ;10HS bare - gnd - G or AG *Table 1 Program 01: 10 Execution Interval (seconds) ;set C1 high to pull SW 12 port high...
  • Page 19 10HS--Soil Moisture Sensor 7. Sample Programs 2: Excite-Delay (SE) (P4) 1: 1 Reps 2: 5 2500 mV Slow Range 3: 1 SE Channel 4: 1 Excite all reps w/Exchan 1 5: 1 Delay (0.01 sec units) 6: 0000 mV Excitation...
  • Page 20 10HS--Soil Moisture Sensor 7. Sample Programs 6: Real Time (P77)^18390 1: 1110 Year,Day,Hour/Minute (midnight = 0000) 7: Average (P71)^12836 1: 1 Reps 2: 2 Loc [ VWC ] *Table 2 Program 02: 0.0000 Execution Interval (seconds) *Table 3 Subroutines End Program...

  • Page 21: Declaration Of Conformity

    10HS Year of First Manufacture: 2008 This is to certify that the 10HS dielectric soil moisture sensors, manufactured by Decagon Devices, Inc., a corporation based in Pullman, Washington, USA meet or exceed the standards for CE compliance as per the Council Directives noted above. All instru- ments are built at the factory at Decagon and pertinent testing documentation is freely available for verification.

  • Page 22: Index

    10HS--Soil Moisture Sensor Index Index Accuracy 1 Alternate connection methods 10 Background 4 Cable length 2 Calibration 12 Calibration service 12 Campbell Scientific 8 Capacitance technique 5 Compatibility 2 Connector types 2 Customer Support 2 Datalogger connections 10 Dielectric permittivity 5...
  • Page 23 10HS--Soil Moisture Sensor Index Liability 3 Measurement Time 1 Mineral soil calibration 11 Operating Temperature 1 Orientation 7 Output 1 Particle size 6 Phone 2 Power requirements 1 Programs 13 Range 1 Removing the sensor 7 Resolution 1 Sample programs 13...

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