6
SYSTEM
3. SYSTEM
This section reviews the components and functionality of the TEROS 21 sensor.
3.1 SPECIFICATIONS
Water Potential
Range: −9 to −100,000 kPa (1.96 to 6.01 pF)
Resolution: 0.1 kPa
Accuracy: ±(10% of reading + 2 kPa) from −9 to −100 kPa
Temperature
Range: −40 to 60 °C
Resolution: 0.1 °C
Accuracy: ±1 °C
Operating Temperature
−40 to 60 °C (0%–100% RH)
No water potential measurement <0 °C
NOTE: Sensors may be used at higher temperatures under certain conditions; contact Customer Support
Power Requirements
3.9 to 15.0 VDC, 0.03 mA quiescent, 10 mA max during 150-ms measurement
Dimensions
9.6 cm × 3.5 cm × 1.5 cm
Sensor Diameter
3.2 cm
Dielectric Measurement Frequency
70 MHz
Measurement Time
150 ms
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