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Comparison of ECH₂O Soil Moisture Probes

All ECH₂O sensors share the following specifications:

Cable Length: 3m (custom lengths and ends available)
Operating Environment: -40 to 60°C, 0 - 100% RH
Measurement Time: 10ms
Resolution: 0.002m3/m3 typical with Em50 and Em5b loggers; other loggers may vary.

TYPE	EC-5	EC-10	EA-10	EC-TM	ECH₂O-TE
LENGTH	5cm	10cm	10cm	5cm	5cm
MEASURES	Volumetric water content	Volumetric water content	Volumetric water content	Volumetric water content and temperature	Volumetric water content, temperature and electrical conductivity
ACCURACY	±3% typical on all soils, up to 8dS/m. ±1-2% with soil-specific calibration.	±4% typical on low EC and medium-textured mineral soils. ±1-2% w/ soil-specific calibration.	±4% typical on low EC and medium-textured mineral soils. ±1-2% w/ soil-specific calibration.	MINERAL SOIL: ±3% up to 8dS/m, ±1-2% w/ soil-specific calibration. ROCKWOOL: ±3%, 0.5-8dS/m. POTTINGSOIL: ±3%, 3-14dS/m.	MINERAL SOIL: ±3% up to 8dS/m, ±1-2% w/ soil-specific calibration. ROCKWOOL: ±3%, 0.5-8dS/m. POTTINGSOIL: ±3%, 3-14dS/m.
RANGE	0-100% VWC	0-40% VWC	0-40% VWC	0-100%VWC	0-100%VWC
ELECTRICAL INTERFACE	3.5mm plug, 3-wire	3.5mm plug, 3-wire	2-wire analog, 4-20mA	3.5mm plug, 3-wire	3.5mm plug, 3-wire
SUPPLY VOLTAGE	2.5-5V DC @ 10mA	2.5-5V DC @ 10mA	line-powered 7-32 VDC, overvoltage & reverse-polarity protected.	3-16 VDC, 0.3mA quiescent, 10mA for 9ms measurement.	3-16 VDC, 0.3mA quiescent, 10mA for 9ms measurement.
FREQUENCY	70 MHz	5 MHz	5 MHz	70 MHz	70 MHz
OUTPUT	Voltage, correlated linearly (soil) or polynomially (growing media) with VWC	Voltage, correlated linearly w/soil VWC	Voltage, correlated linearly w/soil VWC	Serial 3V TTL, 8bit, 1-stop bit, no parity.	Serial 3V TTL, 8bit, 1-stop bit, no parity.

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