GS3 Soil Moisture, Temperature and EC Sensor.

GS3 Ruggedized Soil Moisture, Temperature and EC

The GS3 soil moisture, temperature, and EC sensor is built with an epoxy body and stainless steel needles. The internal circuitry is the same cutting edge design that you'll find in other Decagon soil moisture sensors, but the form factor has been optimized for use in soilless substrates or harsh environments, giving it a wider range of EC measurement and an increased temperature range. Not only do the steel needles improve sensor contact, but they also improve the sensor's ability to measure EC in porous substrates such as peat or perlite.

Accuracy at a Fraction of the Cost

The GS3 measures water content, temperature, and EC independently. Its 70 MHz frequency minimizes salinity and textural effects, making it accurate in most soil or soilless media. Stainless steel needles have an extended surface area to optimize EC measurements, while minimizing substrate disturbance during insertion. Temperature is measured with an onboard thermistor and electrical conductivity is measured using a stainless steel electrode array.

Reasons to pick the GS3:

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

Understand Your Measurements

When used with our DataTrac 3 software, your GS3 data can be used to determine plant available water, growing degree days and pore water electrical conductivity.

Easy Integration

Each GS3 comes standard with both serial and SDI-12 communication options, meaning easy integration with systems manufactured by other companies.

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/m
Using medium specific calibration, ±0.01-0.02m3/m3 (±1-2% VWC) in any porous medium
Electrical Conductivity (EC): ±10% from 0 to 7 dS/m
Temperature: ±1°C
Resolution Ea: 0.1Ea (unitless) from 1-20, <0.75Ea (unitless) from 20-80
VWC: 0.002 m3/m3 (0.2% VWC) from 0 to 40% VWC, 0.001 m3/m3 (0.1% VWC) > 40% VWC
EC: 0.001 dS/m from 0 to 23 dS/m
Temperature: 0.1°C
Range Ea: 1 (air) to 80 (water)
EC: 0-23 dS/m (bulk)
Temperature: -40-50°C
Measurement Speed 150mS
Sensor Type VWC: Frequency domain
EC: Two probe design
Temperature: Thermistor
Output Serial TTL, 3.6 Volt Levels or SDI-12 (contact Decagon for information on SDI-12 mode)
Operating Environment -40°C to 50°C
Power 3.6-15 VDC, 0.3mA quiescent, 25 mA 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 9.3 x 2.4 x 6.5cm
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

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GS-3 Volume


Click here for the Soil Sensors Comparison Page.

GS3 Manual
Size: 314.1 KB (321,633 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 GS3 Soil Moisture, Temperature and EC Sensor.