ECH<sub>2</sub>O 5TE

Soil Moisture, Temperature, and Electrical Conductivity

Engineered for accuracy


Soil moisture, temperature, and electrical conductivity

The 5TE monitors bulk electrical conductivity (EC), in addition to volumetric water content (VWC) and soil temperature.

Monitor salt levels

The 5TE enables users to measure the EC response to salts and fertilizers in the soil. EC Measurements require good contact between the stainless steel electrodes on the sensor, and the soil. In potting soil and soilless medias, we recommend using the GS3 to maintian good soil contact and compensate for air gaps in the substrate.

Engineered for accuracy

The 5TE determines VWC by measuring the dielectric constant of the media using capacitance/frequency domain technology. The sensor uses a 70 MHz frequency, which minimizes salinity and textural effects, making the 5TE accurate in most soils. The 5TE measures temperature with an onboard thermistor, and electrical conductivity using a stainless steel electrode array. VWC in mineral soils is calculated using the Topp equation; other calibrations are provided on request. Temperature and electrical conductivity are factory calibrated for all soil types.

Easy installation

The 5TE’s small size makes it easy to install in the field and the greenhouse. This robust sensor should be pushed directly into undisturbed soil to ensure good accuracy.

Easy integration

Each 5TE comes standard with serial and SDI-12 communication options, meaning easy integration with systems manufactured by other companies.

Advantages of the 5TE

  • Measures VWC, EC, and temperature
  • Monitoring salts
  • SDI-12 compatible
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  • Three measurements in one
  • Plug and play capability
  • Use with the EM60G to collect data remotely
  • Easy installation
  • 70 MHz frequency minimizes salinity and textural effects
  • Measures VWC, EC, and temperature
  • Salt-monitoring capabilities
  • SDI-12 compatible



Volumetric water content (VWC)

Mineral soil calibration: 0.0–1.0 m3/m3
Soilless media calibration: 0.0–1.0 m3/m3
Apparent dielectric permittivity (εa): 1 (air) to 80 (water)
0.0008 m3/m3 from 0%–50% VWC
Generic calibration: ± 0.03 m3/m3 typical
Medium-specific calibration: ±0.02 m3/m3
Apparent dielectric permittivity (εa): 1–40 (soil range), ±1 εa (unitless)
40–80, 15% measurement


Range: –40 to +60 °C
Resolution: 0.1 °C
Accuracy: ±1 °C

Bulk electrical conductivity (EC)

Range: 0–23 dS/m (bulk)
Resolution: 0.01 dS/m from 0–7 dS/m, 0.05 dS/m from 7–23 dS/m
Accuracy: ±10% from 0–7 dS/m, user calibration required from 7–23 dS/m

Measurement volume

See comparison article



DDI serial or SDI-12 communication protocol

Data logger compatibility

Data acquisition systems capable of 3.6- to 15.0-VDC power and serial or SDI-12 communication



Length: 10.9 cm (4.3 in)
Width: 3.4 cm (1.3 in)
Height: 1.0 cm (0.4 in)

Prong length

5.0 cm (1.9 in)

Operating temperature range

Minimum: –40 °C
Maximum: +60 °C
NOTE: Sensors may be used at higher temperatures under certain conditions; contact Customer Support for assistance

Cable length

5 m (standard)
75 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


Supply voltage (VCC to GND)

Minimum: 3.6 VDC
Typical: NA
Maximum: 15.0 VDC

Digital input voltage (logic high)

Minimum: 2.8 V
Typical: 3.0 V
Maximum: 3.9 V

Digital input voltage (logic low)

Minimum: –0.3 V
Typical: 0.0 V
Maximum: 0.8 V

Power line slew rate

Minimum: 1.0 V/ms

Current drain (during measurement)

Minimum: 0.5 mA
Typical: 3.0 mA
Maximum: 10.0 mA

Current drain (while asleep)

Typical: 0.03 mA

Power-up time (DDI serial)

Maximum: 100 ms

Power-up time (SDI-12)

Minimum: 100 ms
Typical: 150 ms
Maximum: 200 ms

Measurement duration

Typical: 150 ms
Maximum: 200 ms


Manufactured under ISO 9001:2015
EM ISO/IEC 17050:2010 (CE Mark)


Have a question or problem? Our support team can help.

We manufacture, test, calibrate, and repair every instrument in house. Our scientists and technicians use the instruments every day in our product testing lab. No matter what your question is, we have someone who can help you answer it.


Phone US: +1 509-332-5600
Phone Europe: +49 89 12 66 52 0

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