Soil moisture - capacitance (HS10 Decagon)

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Decagon 10HS.jpg

Contents

Parameter to be measured:

Soil moisture

Method:

Capacitance

Equipment:

  • HS10 Decagon
Effective range of temperature: -40°C - +50°C
Effective range of soil moisture: 0 - 57 % volumetric water content
Accuracy: ±3% without calibration, ±1% - ±2% with calibration

Advantages:

  • Relatively cheap
  • Easy to install
  • Compatible with many loggers

Disadvantages:

  • Calibration needed
  • Small measurement volume compared to other sensors

What to watch out for:

  • Careful installation, air gaps have a sustainable influence on the measurement compared to other sensors because of the small measurement volume
  • Probe is tenderly and will break, if it is pushed in resistive media.

Problems/Questions:

Links

Projects that used the above equipment:

Other related web sites:

References

  • Kargas, G., Soulis, K. (2012): Performance Analysis and Calibration of a New Low-Cost Capacitance Soil Moisture Sensor, J. Irrig. Drain Eng., 138(7), 632–641. DOI: 10.1061/(ASCE)IR.1943-4774.0000449.
  • Mittelbach, H., Lehner, I., Seneviratne, S.I. (2012): Comparison of four soil moisture sensor types under field conditions in Switzerland, J of Hydrology 430-431, 39-49, DOI: 10.1016/j.jhydrol.2012.01.041.
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