Decagon Devices 10HS Manual
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Decagon Devices 10HS Manual

Soil moisture sernsor
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Decagon Devices, Inc.
Version: July 7, 2016 — 14:04:38

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Summary of Contents for Decagon Devices 10HS

  • Page 1 Decagon Devices, Inc. Version: July 7, 2016 — 14:04:38...
  • Page 2 10HS Decagon Devices, 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 2007-2013 Decagon Devices, Inc. All Rights Reserved...

  • Page 3: Table Of Contents

    1.2 Seller’s Liability ..... . 2 About the 10HS 2.1 Background Info .....

  • Page 4: Introduction

    10HS 1 INTRODUCTION Introduction Thank you for choosing the 10HS soil water content sensor. This innovative sensor enables you to monitor volumetric water content of soil accurately and affordably. This manual helps you understand the sensors features and how to use this device successfully.

  • Page 5: Seller's Liability

    1 INTRODUCTION 10HS Seller’s Liability Seller warrants new equipment of its own manufacture against de- fective workmanship and materials for a period of one year from the date of receipt of equipment. Note: We do not consider the results of ordinary wear and tear, neglect, misuse, accident as defects.

  • Page 6: About The 10Hs

    2 ABOUT THE 10HS About the 10HS The 10HS measures the dielectric constant of the soil in order to find its volumetric water content (VWC). Since the dielectric constant of water is much higher than that of air or soil minerals, the dielectric constant of the soil is a sensitive measure of volumetric water content.

  • Page 7: Specifications

    2 ABOUT THE 10HS 10HS Specifications Range: Apparent Dielectric Permittivity ( ): 1 (air) to 50 Soil Volumetric Water Content ( ) : 0 to 0 57 m (0 to 57%VWC) Accuracy: 0.5 from of 10 to 50 (VWC) VWC: With standard calibration equation,...

  • Page 8: Theory

    10HS 3 THEORY Theory The 10HS sensor measures the volumetric water content of the soil using a capacitance technique. Rapidly charging and discharging a positive and ground electrode (capacitor) in the soil generates an electromagnetic field whose charge time is related to the capacitance ( ) of the soil by Equation 1.

  • Page 9: Installing The Sensor

    field can extend out of the soil and reduce accuracy. Because the 10HS has gaps between its prongs, it is also impor- tant to consider the particle size of the medium you are inserting the sensor into. It is possible to get sticks, bark, roots or other material stuck between the sensor prongs, which will adversely affect readings,...
  • Page 10 Insert the sensor into the undisturbed soil face until the entire sensing portion of the 10HS is inserted. The tip of each prong has been sharpened to make it easier to push the sensor in - be careful with the sharp tips! Backfill the trench taking care to pack the soil...
  • Page 11 4 INSTALLING THE SENSOR 10HS effects on downward water movement. Keep in mind that the sensor measures the average VWC along its length, so a vertical installation will integrate VWC over a 10 cm depth wile a horizontal orientation will measure VWC at a more discrete depth.

  • Page 12: Connecting Sensors

    The 10HS to works well with the Em50 data logger. Simply plug the 3.5 mm stereo plug connector directly into one of the five sensor ports. Next, configure the logger port for the 10HS and set the mea- surement interval.
  • Page 13 ECH2O Utility 1.12 or greater ECH2O DataTrac 2.77 or greater Connecting to a non-Decagon Logger Customers may purchase 10HS sensors for use with non-Decagon data loggers. These sensors typically come configured with stripped and tinned (pigtail) lead wires for use with screw terminals. Refer to your distinct logger manual for details on wiring.
  • Page 14 Scientific Data Loggers, you will need to power the sensors off of the switched 12 V port. If your 10HS is equipped with the standard 3.5 mm plug and you want to connect it to a non-Decagon data logger, you have two op- tions.

  • Page 15: Calibration

    + 7 457 Mineral Soil Calibration For convenience, Decagon has also developed a standard calibration equation for mineral soils to be used with the 10HS. With this stan- dard 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 calibration, the accuracy of the VWC measurements will be improved to 1 to 2% in any soil or other porous medium.

  • Page 17: Sample Programs

    “CRBasic” type loggers. The second program is for a CR10X data logger, but can be easily adapted to other Edlog type loggers. The 10HS needs 3 to 15 V DC excitation, and therefore cannot be excited with the 2.5 V excitation port of many Campbell Scientific data loggers.
  • Page 18 ;Jumper from C1 to SW 12V CTRL - C1 is used to turn on the switched 12V port ;10HS white - excitation - 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 7 SAMPLE PROGRAMS 10HS 1: 51 Set Port 1 Low ;apply calibration (updated 8/09) 4: Polynomial (P55) 1: 1 Reps 2: 1 X Loc [ ten_HS_V ] 3: 2 F(X) Loc [ VWC ] 4: -1.92 5: 6.69 6: -7.37 7: 2.97...

  • Page 20: Declaration Of Conformity

    10HS Year of First Manufacture: 2008 This is to certify that the 10HS dielectric soil moisture sensor, man- ufactured 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 instruments are built at the factory at Decagon and pertinent testing documentation is freely available for verification.
  • Page 21 Index Accuracy, 4 Operating Temperature, 4 Orientation, 7 Background, 3 Output, 4 Cable length, 4 Particle Size, 6 Calibration, 12 Power Requirements, 4 Dielectric, 12 Programs, 14 Service, 12 Campbell Scientific, 14 Range, 4 Capacitance Technique, 5 Removing the sensor, 8 Connecting Resolution, 4 ECH2O Utility, 9...

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