5TE Soil Moisture, Temperature and EC Sensor

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.

Reasons to pick the 5TE:

  • If you need to measure VWC, EC and temperature.
  • If you are managing salts in your system.
  • If you want to use SDI-12.

Integrate with Campbell Scientific Data Loggers

Serial and SDI-12 communication options mean easy integration with systems run by other data loggers (including Campbell Scientific).

Accuracy Apparent dielectric Permittivity (Ea): ±1Ea (unitless) from 1-40 (soil range), ±15% from 40-80
VWC: Using Topp equation: ±0.03m3/m3 (±3% VWC) typical in mineral soils that have solution electrical conductivity <10 dS/mUsing medium specific calibration, ±0.01-0.02m3/m3 (±1-2% VWC) in any porous medium
Resolution Ea: 0.1Ea (unitless) from 1-20, <0.75Ea (unitless) from 20-80
VWC: 0.0008m3/m3 (0.08% VWC) from 0 to 50% VWC
EC: 0.01 dS/m from 0 to 7 dS/m, 0.05 dS/m from 7 to 23.1 dS/m
Temperature: 0.1°C
Range Ea: 1 (air) to 80 (water)
EC: 0-23 dS/m (bulk)
Temperature: -40°C - 50°C
Measurement Speed 150ms
Sensor Type VWC: Frequency domain
EC: Two probe design
Temperature: Thermistor
Output RS232 or SDI-12
Operating Environment -40°C to 50°C
Power 3.6-15 VDC, 0.3mA quiescent, 10mA during 150ms measurement
Cable Length 5m, custom cable lengths available upon request
Cable Connector Types 3.5mm stereo jack plug or stripped and tinned lead wires (3)
Sensor Dimensions 10 x 3.2 x 0.7cm
Data Logger Compatibility (not exclusive) METER: Em50, Em50G, ProCheck
Campbell Scientific: CR200X - series, CR800/CR850, CR1000, CR3000, CR9000X
Other: Any data acquisition system capable of 3.6-15V excitation and serial or SDI-12 communication
Warranty One year, parts and labour

We periodically send an email newsletter containing updates, new product releases, training and advice. If you would like to receive these please subscribe below.


Non UK/Ireland Customers

Non UK/Ireland Customers, please contact Decagon Devices at: www.decagon.com

5TE Volume


Click here for the Soil Sensors Comparison Page.

5TE Manual
Size: 529.6 KB (542,297 bytes)

Soil Sensors Quick Start Guide
Size: 1.5 MB (1,533,464 bytes)

Environmental Catalogue
Size: 2.5 MB (2,581,813 bytes)

Quotation Request

Email us to request a quotation for the 5TE Soil Moisture, Temperature and EC Sensor