Technical specifications

Measuring parameters

Air Temperature and Air Humidity

RFT-2 sensors, protected from rain and direct solar radiation by ventilated weather housings, are used for measuring air temperature and air humidity.


  • measuring range, air temperature: -30 - 70°C
  • measuring range, air humidity: 0 - 100%

Soil Moisture and Soil Temperature

Decagon's 5TM sensors are used for measuring soil moisture and temperature.


  • measuring range, moisture: 0 - 100%
  • measuring range, temperature: -40 - 50°C

Soil Matrix Potential

pF sensors are installed at 60 cm soil depth for measuring soil matrix potentials.


  • measuring range: 1 to 10 000 000 hPa
  • operating temperature: -40 - 80°C

Stem Diameter Changes

Automated point dendrometers are available for monitoring diurnal / seasonal stem diameter changes in young trees.


  • measuring range: 1 - 4 cm stem diameter
  • resolution: 20 µm

Solar Radiation

A SP-Lite Pyranometer is installed at the research plot for measuring solar radiation.


  • spectral rangspectral range: 400 - 1100 nm
  • operating temperature: -30 - 70°C

Fine Root Growth

The temporal and spatial dynamic of fine root growth can be visualized with the CID root scanning system.


  • scanning range: 21.6 x 19.6 cm
  • scan resolution: 1200 dpi
  • USB interface for data transfer

Soil Water Extraction

Suction cups are used for collecting soil water for chemical analysis at different soil depths.


  • diameter: 20 mm
  • active surface: 34 cm2
  • pore size: 1 µm

Soil Air Extraction

Gas-permeable tubes are used for collecting air samples for chemical analysis at different soil depths.


  • permeable for many gaseous substances (e.g. CO2, NO2, NHund C2H4)

Physiological Gas Exchange

Two LICOR 6400 devices are available for studying the gas exchange of needles or leaves.


  • external CO2 injector 
  • leaf cuvette with internal LED light source
  • sensor for photosynthetic active radiation

Chlorophyll Fluorescence

A portable PAM 2000 device is available for analyzing chlorophyll fluorescence-related parameters in leaves.


  • actinic light source for inducing chlorophyll fluorescence
  • flexible fibre optic and leaf clips for dark adaptation of leaves

Chlorophyll Content

A portable SPAD-chlorophyll meter is available for measuring chlorophyll contents in leaves.


  • two LED light sources for differential determination of optical density
  • max. leaf thickness: 1.2 mm

Water Potential

A Scholander bomb is available for measuring water potential in needles, leaves and twigs.


  • measuring range: 0 - 40 bar
  • pressure chamber: 12.5 x 6.25 cm
  • adapter for needles, leaves and twigs

Controll unit and data collection

Software for MODEOK Controlling and Data Collection

Controlling and data collecting software by LabVIEW, National Instruments.

Hardware for MODEOK Controlling and Data Collection

Controlling and data collecting hardware by Real-Time Hypervisor, National Instruments.