10
SySTEM
3. SySTEM
This section reviews the components and functionality of the TEROS 10 sensor.
3.1 SpECIFICATIONS
MEASUREMENT SpECIFICATIONS
Volumetric Water Content (VWC)
Range
Mineral soil calibration
0.00–0.64 m
3
/m
3
Soilless media
calibration
0.0–0.7 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
Mineral soil calibration
±0.03 m
3
/m
3
typical in mineral soils that have solution
EC <8 dS/m
Soilless media calibration
±0.05 m
3
/m
3
typical in media that has a 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
COMMUNICATION SpECIFICATIONS
Output
1,000–2,500 mV
Data Logger Compatibility
Data acquisition systems capable of switched 3.0–15 VDC excitation and single-ended
voltage measurement at greater than or equal to 12-bit resolution.
