10
SYSTEM
3. SYSTEM
This section reviews the components and functionality of the TEROS 11/12 sensor.
3.1 SPECIFICATIONS
MEASUREMENT SPECIFICATIONS
Volumetric Water Content (VWC)
Range
Mineral soil calibration
0.00–0.70 m
3
/m
3
Soilless media
calibration
0.0–1.0 m
3
/m
3
Apparent dielectric
permittivity (
ε
a
)
1 (air) to 80 (water)
NOTE: The VWC range is dependent on the media the sensor is calibrated to. A custom calibration will
accommodate the necessary ranges for most substrates.
Resolution
0.001 m
3
/m
3
Accuracy
Generic
calibration
±0.03 m
3
/m
3
typical in mineral soils that have solution
EC <8 dS/m
Medium specific
calibration
±0.01–0.02 m
3
/m
3
in any porous medium
Apparent dielectric
permittivity (
ε
a
)
1–40 (soil range) , ±1
ε
a
(unitless)
40–80, 15% of measurement
Dielectric Measurement Frequency
70 MHz
Temperature
TEROS 11
Range
−40 to +60 °C
Resolution
0.1 °C
Accuracy
±1 °C from −40 to 0 °C
±0.5 °C from 0 to +60 °C
NOTE: Temperature measurement, for applicable sensors, may not be accurate if sensor is not fully immersed in the
medium of interest, due to longer equilibration time.
