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Thursday November 20, 2008
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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

EC-20

EA-10

EC-TM

ECH2O-TE

LENGTH
5cm
10cm
20cm
10cm
5cm
5cm

MEASURES
Volumetric water content
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.
±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
0-40% VWC
0-100%VWC
0-100%VWC

ELECTRICAL INTERFACE
3.5mm plug, 3-wire
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
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
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
Voltage, correlated linearly w/soil VWC
Serial 3V TTL, 8bit, 1-stop bit, no parity.
Serial 3V TTL, 8bit, 1-stop bit, no parity.

Download this chart as a PDF (152K)

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