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ECH20 Tech Specs
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Technical Specifications

Volumetric water content (VWC)
Range
Mineral soil calibration: 0.0000 – 0.5700 m3/m3 (0%−57% VWC)
Soilless media calibration: 0.0000 – 0.6900 m3/m3 (0%−69% VWC)
Apparent dielectric permittivity (εa): 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
0.0008 m³/m³ (0.08% VWC) in mineral soils from 0−0.50 m³/m³ (0%−50% VWC)
Accuracy
With standard calibration equation, 0.03 m³/m³ (3% VWC) typical in mineral soils that have solution electrical conductivity <10 dS/m

NOTE: With soil-specific calibration, ±0.02 m³/m³ ( ±2% VWC) is typical in any soil.
Measurement Specifications
Measurement volume
Communication Specifications
Output
300−1,250 mV, independent of excitation voltage
Data Logger Compatibility
METER data loggers (ZL6, EM50/60 series, Em5b) or any data acquisition systems capable of switched 3–15 VDC excitation and single-ended voltage measurement at greater than or equal to 12-bit resolution.
Physical Specifications
Dimensions
Length: 16.0000 cm (6.3 in)
Width: 3.3000 cm (1.3 in)
Height: 0.8000 cm (0.3 in)
Prong length
10.0000 cm (3.94 in)
Operating Temperature Range
Minimum: -40 °C
Typical: NA
Maximum: 50 °C
NOTE: Sensors may be used at higher temperatures under certain conditions; contact Customer Support for assistance.
Cable Length
5 m (standard)
40 m (maximum custom cable length)

NOTE: Contact Customer Support if a nonstandard cable length is needed.
Connector Types
3.5-mm stereo plug connector or stripped and tinned wires
Electrical and Timing Characteristics
Supply Voltage (VIN to GND)
Minimum: 3.0000 VDC
Typical: NA
Maximum: 15.0000 VDC
Measurement Duration
Maximum: 10.0000 ms
Other
Compliance
Manufactured under ISO 9001:2015
EM ISO/IEC 17050:2010 (CE Mark)
2014/30/EU
2011/65/EU
EN61326-1:2013
EN50581:2012
GSA