Decagon Devices GS1 Operator's Manual
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Decagon Devices GS1 Operator's Manual

Soil moisture sensor
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Operator's Manual
Decagon Devices, Inc.
Version: August 5, 2014 — 08:49:46

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Summary of Contents for Decagon Devices GS1

  • Page 1 Operator’s Manual Decagon Devices, Inc. Version: August 5, 2014 — 08:49:46...
  • Page 2 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 “ECH2O” is a registered trademark of Decagon Devices, Inc. c 2001-2014 Decagon Devices, Inc. All Rights Reserved...

  • Page 3: Table Of Contents

    1.2 Seller’s Liability ..... . 2 About GS1 2.1 Background ......

  • Page 4: Introduction

    1 INTRODUCTION Introduction Thank you for choosing Decagon’s GS1 Volumetric Water Content sensor. This manual can help you understand the sensor features and ensure successful sensor operation. We hope you find the contents of this manual useful in understanding your instrument and maximiz- ing its benefit to you.

  • Page 5: Seller's Liability

    1 INTRODUCTION 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 Gs1

    Operator’s Manual. The two-prong design and high measurement frequency allows the GS1 to measure VWC from 0 to 100% (VWC of saturated soils is generally 40 to 60% depending on the soil type) and allows accurate measurement of all soils and soilless medias with a wide range of salinities.
  • Page 7 2 ABOUT GS1 Power Requirements: 3.0 VDC to 15 VDC (absolute maximum) @ 15 mA Output: 1,000 to 2,500 mV Operating Environment: -40 to 50 C Range of Measurement: 0 to 100% VWC Sensor dimensions: 8.9 cm x 1.8 cm x 0.7 cm Connector Types: 3.5 mm (stereo) plug or stripped &...

  • Page 8: Theory

    The stored charge is proportional to substrate dielectric and substrate volumetric water content. The GS1 measures the charge and outputs a raw value that strongly cor- relates to VWC. Decagon has a few helpful reminders to consider before using your sensor.

  • Page 9: Orientation

    PVC portion of the sensor. Orientation You may orient the GS1 in any direction. However, to eliminate cable strain, orient the sensor vertically so that the cable exit is closest to the soil surface, and does not need to bend.

  • Page 10: Connecting Sensors

    4 CONNECTING SENSORS Connecting Sensors Decagon designed the GS1 sensor for use with our Em50 series data loggers, the Em5b, or the ProCheck handheld reader. The standard sensor (with a 3.5 mm “stereo plug” connector) quickly connects to and is easily configured within a Decagon logger or ProCheck. (Fig-...

  • Page 11: Wiring

    4 CONNECTING SENSORS or DataTrac 3. Before trying to configure your logger, please check your software version to ensure it will support the GS1. To update your software to the latest version, please visit Decagon’s software download site at www.decagon.com/support.
  • Page 12 Scientific Data Loggers, you will need to power the sensors off of the switched 12 V port. If your GS1 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 13: Collecting Data

    3.6 to 15 V DC excitation and therefore cannot be excited with the 2.5 V excitation port of many Campbell Scientific data loggers. We recommend using the switched 12 V or CAO port to excite the GS1. CR Basic Type Data Logger ’CR3000 Series Datalogger...
  • Page 14 ;is used to turn on the switched 12V port ;GS1 white - excitation - SW 12V ;GS1 red - Vout - SE CH1 ;GS1 bare - gnd - G or AG *Table 1 Program 01: 10.0000 Execution Interval (seconds) ;set C1 high to pull SW 12 port high...
  • Page 15 5 COLLECTING DATA 1: 51 Set Port 1 Low 4: If time is (P92) 1: 0000 Minutes (Seconds --) into a 2: 60 Interval (same units as above) 3: 10 Set Output Flag High (Flag 0) 5: Real Time (P77) 1: 1110 Year,Day,Hour/Minute (midnight = 0000) 6: Average (P71) 1: 1 Reps...

  • Page 16: Calibration

    Sensor Calibration Values Following is a list of the both the millivolt and RAW calibration values for the GS1, where Θ is the volumetric water content, mV is the millivolt output of the sensor, and where RAW is the raw sensor output, when you read the sensor with a Decagon logger.
  • Page 17 ˜40 to 50% VWC. Soilless Growing Media The GS1 has been calibrated in media types including potting soil, perlite and peat. The goal of these calibrations is to create a generic calibration equation that works in all types of each substrate, with an accuracy of better that 5% volumetric water content (VWC).
  • Page 18 6 CALIBRATION for a data logger with 3.6 to 15 V excitation.

  • Page 19: Maintenance And Troubleshooting

    7 MAINTENANCE AND TROUBLESHOOTING Maintenance and Troubleshooting If you encounter problems with the GS1, they most likely will mani- fest themselves in the form of incorrect or erroneous readings. Before contacting Decagon about the sensor, do the following: Check to make sure the connections to the data logger are both correct and secure.
  • Page 20 7 MAINTENANCE AND TROUBLESHOOTING calibrations so be sure to use the one specific to your substrate. 3. PROBLEM Sensor readings are too high. SOLUTION: Check to make sure that the soil was not packed excessively during sensor installation. Higher density can cause elevated sensor readings.

  • Page 21: Declaration Of Conformity

    Model Number: Year of First Manufacture: 2014 This is to certify that the GS1 dielectric soil moisture sensor, manu- factured 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 testing documentation is freely available for verification.
  • Page 22 Index Accuracy, 3 Specifications, 3 Calibration Troubleshooting, 16 Mineral Soils, 13 Warranty, 1 Sensor, 13 Wiring Soilless Growing Media, 14 Pigtail, 8 Values, 13 Stereo Plug, 8 CE Compliance, 18 Wiring Diagrams, 8 Connecting ECH2O Utility, 7 Em50 Series Data Logger, 7 Em5b, 7 ProCheck, 7 Contact Information, 1...

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