Difference between revisions of "Soil moisture - capacitance (TMS)"

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[[Image: Tms1.jpg]]
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[[File:Tms probe.png|thumb|right|Longitudinal view on TMS probe]]
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[[File:TMS porbe installed.png|thumb|right|View on installed TMS probe]]
 
==Parameter to be measured:==
 
==Parameter to be measured:==
Soil moisture, soil and air temperature
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Soil moisture, soil, surface and air temperature
  
 
==Method:==
 
==Method:==
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==Equipment:==
 
==Equipment:==
: temperature measurement with sensor MAXIM/DALLAS Semiconductor DS7505U+, with resolution of 0.0625 °C and with accuracy of ±0.5 °C
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* 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
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* soil moisture measurement based on capacity technique in the frequency of 100-200MHz
: integrated data loggers of 32MBit
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* integrated data loggers of 32MBit
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==Advantages:==
 
==Advantages:==
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* stand alone system
 
* cheap
 
* cheap
 
* Easy to install
 
* Easy to install
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* Calibration needed
 
* Calibration needed
 
* Small measurement volume compared to other sensors
 
* Small measurement volume compared to other sensors
* not for portable usage designed
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*Actual Software is less comfortable
* life time is short (in the first two years errors of the measured values start to increase, especially the temperature sensor is effected)
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*Connection between readout unit and probe can be improoved
  
 
==What to watch out for:==
 
==What to watch out for:==
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Projects that used the above equipment:
 
Projects that used the above equipment:
  
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* [http://www.comtess.uni-oldenburg.de/ COMTESS]
 
* [http://teodoor.icg.kfa-juelich.de/overview-de TERENO]
 
* [http://teodoor.icg.kfa-juelich.de/overview-de TERENO]
  
 
Other related web sites:
 
Other related web sites:
 
*[http://www.tomst.com/site/de/tms.html TOMST®]
 
*[http://www.tomst.com/site/de/tms.html TOMST®]
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*[http://www.tomst.com/tms/Home.html TMS3 TOMST Measuring System - Station for spatially distributed measurements of soil moisture and ambient temperature in vast fields]
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*[http://www.tomst.com/tms/Software.html TMS software and calibration set for typical soils]
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==References==
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*Wild, J., Kopecký, M., Zmeškalová, J., Hadincová, V., Trachtová, P., Nováková, O., Štípek, A., Šanda, M., Haase, T., Field monitoring of microclimate: new combined thermal and soil moisture standalone unit
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*[http://article.sciencepublishinggroup.com/pdf/10.11648.j.earth.20130202.15.pdf Hernández, J.A.C. et al., 2013. Unsaturated volcanic tephra and its effect for soil movement in El Salvado. Earth Science 2(2), 58-65, DOI: 10.11648/j.earth.20130202.1]
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*[http://botanika.prf.jcu.cz/thesis/pdf/SvetlikovaP_Mgr13.pdf Světlíková, P., 2012. Impact of local heat leakage on vegetation and participation of non-native species. Master thesis, České Budějovice, CZ]
  
==References==
 
  
 
[[Category:Equipment]]
 
[[Category:Equipment]]
 
[[Category:Soil Moisture]]
 
[[Category:Soil Moisture]]
 
[[Category:Temperature]]
 
[[Category:Temperature]]

Latest revision as of 16:16, 8 December 2016

Longitudinal view on TMS probe
View on installed TMS probe

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