METER TEROS 12 - 3. System; 3.1 Specifications

10
SYSTEM
3. SYSTEM
This section reviews the components and functionality of the TEROS 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
Range −40 to 60 °C
Resolution 0.1 °C
Accuracy ±1 °C
Bulk Electrical Conductivity (EC
b
)
Range 0–10 dS/m (bulk)
Resolution 0.001 dS/m
Accuracy ±5% of measurement