TEROS 54
Tech Specs
TECHNICAL SPECIFICATIONS
Volumetric Water Content
Range
Mineral Soil Calibration: 0.00−0.70 m3/m3
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.
Soilless media calibration: 0.00-1.00 m3/m3
Resolution
0.001 m3/m3
Accuracy
Generic Calibration: ±0.05 m3/m3 typical in mineral soils that have solution EC < 8 dS/m
Medium Specific Calibration: ±0.02–0.03 m3/m3 in any porous medium
Apparent Dielectric Permittivity (εa): 1–40 (soil range), ±1 (εα) (unitless)
40–80, 15% of measurement
40–80, 15% of measurement
Measurement Specifications
Dielectric Measurement Frequency
70 MHz
Measurement Volume
Temperature
Range: –20 to +60 °C
Resolution: 0.03 °C
Accuracy: ±0.5 °C from –20°C to +0 °C
±0.25 °C from 0°C to 60 °C
±0.25 °C from 0°C to 60 °C
Measurement Depths
15, 30, 45, and 60 cm
Communication Specifications
Output
DDI Serial and SDI-12 communications protocol
3-wire cable version
4-wire cable version
RS-485 Modbus RTU and tensioLINK serial communications protocol
4-wire version
3-wire cable version
4-wire cable version
RS-485 Modbus RTU and tensioLINK serial communications protocol
4-wire version
Data Logger Compatibility
METER ZL6 and EM60 data loggers or any data acquisition system capable of 4.0- to 24.0-VDC power and serial interface with SDI-12 and/or RS-485 interface, Modbus RTU, or tensioLINK communication.
Physical Specifications
Dimensions
Diameter: (Shaft) 6.0 cm (2.36 in)
Length: 75.0 cm (29.53 in)
Width: (Head) 11.0 cm (4.33 in)
Operating Temperature Range
Minimum: –20 °C
Maximum: +60 °C
Cable Length
Standard: 5.0 m (stereo plug and stripped and tinned wires)
75.0 m (maximum custom cable length)
5.0 m (M12 connector)
75.0 m (maximum custom cable length)
5.0 m (M12 connector)
NOTE: Contact Customer Support if a nonstandard cable length is needed.
Cable Diameter
Stereo Plug: 4.2 ±0.2 mm (0.16 ±0.01 in) with minimum jacket of 0.8 mm (0.031 in)
M12 Plug: 5.5 ±0.2 mm (0.22 ±0.01 in) with minimum jacket of 1.0 mm (0.039 in)
M12 Plug: 5.5 ±0.2 mm (0.22 ±0.01 in) with minimum jacket of 1.0 mm (0.039 in)
Connector Size
3.50 mm (diameter)
14.4 mm (diameter M12)
14.4 mm (diameter M12)
Connector Types
Stereo plug connector or stripped and tinned wires
4-pin M12 connector or stripped and tinned wires
4-pin M12 connector or stripped and tinned wires
Conductor Gauge
Stereo Plug: 22-AWG / 24-AWG ground wire
M12 Plug: 22-AWG
M12 Plug: 22-AWG
Electrical and Timing Characteristics
Supply Voltage Power to Ground
Minimum: 4.0 VDC
Maximum: 24.0 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)
Typical: 3.6 V
Power Line Slew Rate
Minimum: 1.0 V/ms
Current Drain (During Measurement)
Minimum: 3 mA (during 500-ms measurement)
Typical: 35 mA (during 500-ms measurement)
Maximum: 50 mA (during 500-ms measurement)
Current Drain (While Asleep)
Minimum: 0.03 mA
Typical: 0.1 mA
Power Up Time (DDI Serial)
Minimum: 500 ms
Maximum: 800 ms
Power Up Time (SDI-12)
Typical: 1,000 ms
Power Up Time (SDI-12, DDI Serial Disabled)
Minimum: 500 ms
Typical: 600 ms
Maximum: 800 ms
Measurement Duration
Minimum: 500 ms (4 depths)
Maximum: 800 ms
Other
Compliance
EM ISO/IEC 17050:2010 (CE Mark)
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