Decagon Devices MAS-1 Operator's Manual
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Decagon Devices MAS-1 Operator's Manual

4-20 ma soil moisture sensor
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MAS-1
4-20 mA Soil Moisture Sensor
Operator's Manual
Decagon Devices, Inc.
Version: October 22, 2014 — 10:19:59

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Summary of Contents for Decagon Devices MAS-1

  • Page 1 MAS-1 4-20 mA Soil Moisture Sensor Operator’s Manual Decagon Devices, Inc. Version: October 22, 2014 — 10:19:59...
  • Page 2 MAS-1 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 2014 Decagon Devices, Inc. All Rights Reserved...

  • Page 3: Table Of Contents

    1.4 Seller’s Liability ..... . 2 About the MAS-1 2.1 Specifications ..... . .

  • Page 4: Introduction

    MAS-1 1 INTRODUCTION Introduction Thank you for choosing the MAS-1 4-20 mA Soil Moisture Sensor. This innovative sensor enables you to monitor soil moisture accu- rately and affordable with a standard 2-wire, 4-20 mA analog inter- face for use with many data acquisition and control systems. The MAS-1 cannot be used with the standard Decagon data loggers.

  • Page 5: Warranty

    1 INTRODUCTION MAS-1 Warranty This sensor has a 30-day satisfaction guarantee and a one-year war- ranty on parts and labor. Your warranty is automatically validated upon receipt of the instrument. Note: The one year service plan activates when Decagon ships the instrument and not at the time of purchase.

  • Page 6: About The Mas-1

    2 ABOUT THE MAS-1 About the MAS-1 The MAS-1 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 constant of the soil is a sensitive measure of water content.
  • Page 7 2 ABOUT THE MAS-1 MAS-1 1. Red wire: (+) supply 2. Black wire: (-) output 3. Shield: Not connected Measurement Type: Volumetric water content (VWC) Range: 0 to 100% VWC typical Resolution: Depends on current measurement (data acquisi- tion) device...

  • Page 8: Integrating The Mas-1

    Since the measurement intervals are con- trolled by the MAS-1 itself, there is no need to pulse the excitation voltage. A constant supply voltage should be applied in order for...
  • Page 9 MAS-1 the current transmitted though the MAS-1. The red wire (see Fig- ure 2) of the MAS-1 is connected to a voltage output terminal that is able to supply 12 to 32 VDC. The black wire is connected to an input terminal that accepts a current input ranging from 4 mA to 20 mA.
  • Page 10 It should have a voltage rating higher than the largest supply voltage. Be sure to observe correct polarity. The MAS-1 requires a voltage of at least 12 V. This limits the value of R olt since part of the total voltage drop will be across the re- sistor.

  • Page 11: Testing The Sensor

    3 INTEGRATING THE MAS-1 MAS-1 3. The MAS-1 requires only two conductors, so long lines are both lower in noise and less expensive. 4. With the MAS-1 sensor the source impedance is small, and a current loop is highly immune to noise on the line.

  • Page 12: Installing The Mas-1

    Procedure 1. The MAS-1 sensor was designed for easy installation into the soil. After digging a hole to the desired depth, push the prongs on the sensor into undisturbed soil at the bottom of the hole or into the sidewall of the hole.

  • Page 13: Orientation

    4 INSTALLING THE MAS-1 MAS-1 Figure 4: Installation Orientation Orientation The sensor can be oriented in any direction. However, orienting the flat side perpendicular to surface of the soil minimizes effects on downward water movement. Removing the Sensor When removing the sensor from the soil, do not pull it out of the soil by the cable! Doing so may break internal connections and make the sensor unusable.

  • Page 14: Calibration

    8 dS/m If you wish to use the MAS-1 in a medium that is not listed below, if you need better than 6% accuracy, or if you are working in a high salinity material, then you should develop a custom calibration for your particular medium.

  • Page 15: Rock Wool

    MAS-1 equation may not result in good accuracy in your particular mix (although precision should still be good). We recommend a custom calibration for best accuracy when using the MAS-1 in potting soils. (0.29 mA) V W C = 0.00531...

  • Page 16: Troubleshooting

    Check the wiring and make sure that the supply voltage is in the specified range. If the MAS-1 is reading a negative value for VWC while it is in- serted into the soil, make sure that you have good sensor-to-soil contact.

  • Page 17: Declaration Of Conformity

    MAS-1 Year of First Manufacture: 2008 This is to certify that the MAS-1 dielectric soil moisture sensors, manufactured by Decagon Devices, Inc., a corporation based in Pull- man, Washington, USA meet or exceed the standards for CE compli- ance 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 18 Index Calibration, 11 Contact Information, 1 Customer Support, 1 Declaration of Conformity, 14 Dielectric constant, 3 Email, 1 Functional testing, 8 Installation, 9 Integration, 5 Orientation, 10 Seller’s Liability, 2 Specifications, 3 Troubleshooting, 13 Warranty, 2 Wiring, 5...

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