EC-5 2 ABOUT EC-5
2 About EC-5
The EC-5 determines volumetric Water Content (VWC) by measur-
ing the dielectric constant of the media using capacitance and fre-
quency domain technology. The 70 MHz frequency minimizes salinity
and textural effects, making this sensor accurate in almost any soil
or soilless media. It arrives with factory calibration for mineral soils,
potting soils, rockwool, and perlite included in this Operator’s Man-
ual.
The two-prong design and higher measurement frequency allows the
EC-5 to measure VWC from 0 to 100% (VWC of saturated soils is
generally 40 to 60% depending on the soil type) and allows accurate
measurement of all soils and soilless medias with a wide range of
salinities.
2.1 Specifications
Measurement Time: 10 ms (milliseconds)
Accuracy: at least 0.03 m
3
/m
3
typical soils, up to 8 dS/m
With soil-specific calibration: ±.02 m
3
/m
3
(±2%)
Resolution: 0.001 m
3
/m
3
VWC in mineral soils, 0.25% in growing
media
Power Requirements: 2.5 VDC to 3.6 VDC @ 10 mA
Output: 10 to 40% of excitation voltage (250 to 1,000 mV at 2,500
mV excitation)
Operating Environment: -40 to 50
◦
C
1
Range of Measurement: 0 to 100%
Sensor dimensions: 8.9 cm × 1.8 cm × 0.7 cm
Connector Types: 3.5 mm (stereo) plug or stripped & tinned lead
wires (Pigtail)
1
Sensors can be used at higher temperatures under certain conditions. Please
contact Decagon for assistance.
3
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