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Decagon Devices MAS-1 User Manual

4-20 ma soil moisture sensor
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MAS-1
4-20 mA Soil Moisture Sensor
User Manual
Version 2

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Summary of Contents for Decagon Devices MAS-1

  • Page 1 MAS-1 4-20 mA Soil Moisture Sensor User Manual Version 2...
  • Page 2 Decagon Devices, Inc. 2365 NE Hopkins Court Pullman WA 99163 (509)332-2756 www.decagon.com support@decagon.com ©2011 Decagon Devices, Inc. All rights reserved.

  • Page 3: Table Of Contents

    Seller’s Liability .....3 2. About the MAS-1 ....

  • Page 4: Introduction

    MAS-1 Soil Moisture Sensor 1. Introduction 1. Introduction Thank you for choosing the MAS-1 4-20 mA Soil Moisture Sensor. These innovative sensors will enable you to monitor soil moisture accurately and affordably with a standard 2- wire, 4-20 mA analog interface for use with many data acquisition and control systems.

  • Page 5: Customer Service And Tech Support

    Call Monday - Friday, between 8 a.m. and 5 p.m. PST. US and Canada (toll-free): 1-800-755-2751 Outside of the US and Canada: (509) 332-2756 Fax: (509) 332-5158 E-mail: support@decagon.com. NOTE: If you purchased your MAS-1 through a distributor, please contact them for assistance.

  • Page 6: Warranty

    MAS-1 Soil Moisture Sensor 1. Introduction Warranty The MAS-1 has a one year warranty on parts and labor. It is activated upon the arrival of the instrument at your location. Seller’s Liability Seller warrants new equipment of its own manufacture...

  • Page 7: About The Mas-1

    The MAS-1 was designed to be used with standard 4-20 mA controllers and monitoring systems. It cannot be used with Decagon logging systems. For more information about using Decagon logging systems please contact Decagon’s...

  • Page 8: Integrating The Mas-1

    A 4-20mA system generally consists of a sensor, a transmit- ter, a power supply, and a device to read the current being transmitted through the current loop. The MAS-1 is an inte- grated sensor and 4-20mA transmitter. When the MAS-1 is...

  • Page 9: Wiring

    MAS-1 Soil Moisture Sensor 3. Integrating the MAS-1 by the MAS-1 itself, there is no need to pulse the excitation voltage. A constant supply voltage should be applied in order for the MAS-1 to function as it is designed. Wiring...
  • Page 10 Volt that the MAS-1 circuitry can drive current through. The val- ues in Table 1 represent the maximum load that the MAS-1 can drive at the given supply voltage. Equation (2) was derived from the values in Table 1, which were obtained through direct measurement.
  • Page 11 R , the Volt Volt Max output current will decrease, which will cause the MAS-1 to output incorrect readings. Equation (2) can be used to deter- mine the maximum value for R Volt = 58.651(Vin) - 355.76...

  • Page 12: Testing The Sensor

    0.4 to 2 volts. Testing the Sensor After integrating the MAS-1 into your PLC or other data acquisition system, it is always a good idea to test the sensor output to verify that it is functioning correctly with your sys- tem.

  • Page 13: Installing The Mas-1

    This can attenuate the sensor's electromagnetic field and adversely affect sensor readings. Because the MAS-1 has gaps between its prongs, it is also important to consider the size of the media 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 14: Orientation

    MAS-1 Soil Moisture Sensor 4. Installing the MAS-1 2. Carefully backfill the hole to match the bulk density of the surrounding soil. Be careful to not over stress the cable or overmold by bending when installing the sen- sor. Orientation The sensor can be oriented in any direction.

  • Page 15: Calibration

    8 dS/m. If you wish to use the MAS-1 in a medium that isn't listed below, if you need bet- ter than ± 4% accuracy, or if you are working in a high salin- ity material, then you should develop a custom calibration for your particular medium.

  • Page 16: Potting Soil/Peat

    35% VWC. VWC= 0.0479 * mA - 0.391 Potting Soil/Peat The following equation can be used to convert MAS-1 trans- mitted current into VWC in potting soil and peat potting mixes. Please note that different potting soil types are quite...

  • Page 17: Troubleshooting

    • If the MAS-1 readings in air and/or water are outside the ranges given in the Testing the Sensor section, then there is likely a problem with the connection to the PLC or other data acquisition system.

  • Page 18: Declaration Of Conformity

    MAS-1 Year of First Manufacture: 2011 This is to certify that the MAS-1 soil moisture sensor, man- ufactured 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.

  • Page 19: Index

    MAS-1 Soil Moisture Sensor Index Index Calibration 12 Contact information 2 Declaration of conformity 15 Dielectric constant 4 E-mail 2 Fax Number 2 Functional testing 9 Installation 10 Integration 5 Orientation 11 Seller’s liability 3 Specifications 1 Telephone number 2...
  • Page 20 MAS-1 Soil Moisture Sensor Index Troubleshooting 14 Warranty 3 Wiring 6...

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