Soil moisture - capacitance (TMS)

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Longitudinal view on TMS probe
View on installed TMS probe

Contents

Parameter to be measured:

Soil moisture, soil, surface and air temperature

Method:

Capacitance

Equipment:

  • temperature measurement with sensor MAXIM/DALLAS Semiconductor DS7505U+, with resolution of 0.0625 °C and with accuracy of ±0.5 °C
  • soil moisture measurement based on capacity technique in the frequency of 100-200MHz
  • integrated data loggers of 32MBit

Advantages:

  • stand alone system
  • cheap
  • Easy to install

Disadvantages:

  • Calibration needed
  • Small measurement volume compared to other sensors
  • Actual Software is less comfortable
  • Connection between readout unit and probe can be improoved

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

Problems/Questions:

Price:

80 € (2013, Europe)

Links

Projects that used the above equipment:

Other related web sites:

References

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