TEROS 22
Tech Specs
TECHNICAL SPECIFICATIONS
Measurement Specifications
Water Potential
Range: 0 to –100,000 kPa (1.70 to 6.00 pF)
Resolution: 0.1 kPa
Accuracy: ±(10% of reading + 2 kPa) from –100 to –5 kPa
NOTE: TEROS 22 can read up to 0 kPa when on a wetting path. The air entry of the soil limits the performance of the sensor to –5 kPa on the drying curve.
NOTE: TEROS 22 is not well calibrated beyond –100 kPa. For more information on using the TEROS 21 beyond this range, see Section 3.3.3 in the user manual
Dielectric Measurement Frequency
70 MHz
Temperature
Range: –40.00 to +60.00 °C
Resolution: 0.10 °C
Accuracy: ±1.00 °C
Communication Specifications
Output
DDI serial or SDI-12 communication protocol
Data Logger Compatibility
METER ZL6 and EM60 data loggers or any data acquisition system capable of 4.0- to 15-VDC power and serial or SDI-12 communication
Physical Specifications
Dimensions
Diameter: 1.7 cm (0.67 in)
Length: 17 cm (6.7 in)
Length with optional extensions: 40, 40, and 120 cm (15.7, 31.5, and 47.3 in)
Sensor Diameter
1.7 cm (0.67 in)
Operating Temperature Range
Minimum: –40.00 °C
typical: NA
Maximum: +60.00 °C
NOTE: Sensors may be used at higher temperatures under certain conditions; contact Customer Support for assistance.
Cable Length
5 m (standard)
75 m (maximum custom cable length)
75 m (maximum custom cable length)
NOTE: Contact Customer Support if a nonstandard cable length is needed.
Connector Types
Stereo plug connector or stripped and tinned wires
Connector Size
3.50 mm
Conductor Gauge
22-AWG \ 24-AWG ground wire
Electrical and Timing Characteristics
Supply Voltage (VCC to GND)
Minimum: 4.0 VDC
Typical: NA
Maximum: 15.0 VDC
Digital Input Voltage (Logic High)
Minimum: 2.8 V
Typical: 3.6 V
Maximum: 5.0 V
Digital Input Voltage (Logic Low)
Minimum: –0.3 V
Typical: 0.0 V
Maximum: 0.8 V
Digital Output Voltage (Logic High)
Minimum: NA
Typical: 3.6 V
Maximum: NA
Required Supply Current
Minimum: 15 mA
Typical: NA
Maximum: NA
Power Line Slew Rate
Minimum: 1.0 V/ms
Typical: NA
Maximum: NA
Power Up Time (DDI Serial)
Minimum: NA
Typical: 100 ms
Maximum: 350 ms
Time before sensor is responsive to SDI-12 commands (DDI serial enabled)
Minimum: NA
Typical: 260 ms
Maximum: 500 ms
Time before sensor is responsive to SDI-12 commands (DDI serial disabled)
Minimum: NA
Typical: 170 ms
Maximum: NA
Measurement Duration
Minimum: NA
Typical: 50 ms
Maximum: NA
Other
Compliance
EM ISO/IEC 17050:2010 (CE Mark)
EN 55011:2016 / A1:2017 (RCM Mark)
EN 55011:2016 / A1:2017 (RCM Mark)
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