Aranet PRO - Soil (Substrate) Sensor

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4.1.2 Soil (Substrate) Sensor
The soil (substrate) Sensor displays the Temperature, Volumetric Water Content and Pore Water
Electrical Conductivity measurement values.
Under the “Sensors” menu it is possible to select the calibration of the VWC and EC (pore water)
calculation method, by selecting Topp, Soilless, Mineral Soil or Rockwool. Should you require to modify the
calibration curve, change the required calibration values. If any of the preset calibration values are changed,
the method type will be change to “Custom”.
The calibration formula is expressed as a polynomial: VWC = a + b*ε + c*ε
2
+ d*ε
3
+ e*ε
4
+ f*ε
5
+ g*ε
0.5
,
where ε is the apparent dielectric permittivity.