METER Legacy Soil Moisture Sensors

METER Legacy Soil Moisture Sensors

    GS3 Ruggedized Soil Moisture, Temperature, and Electrical Conductivity Sensor

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    • Description

      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 METER 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.

      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.

      Advantages of the GS3

      • Measure VWC, EC, and temperature in soilless substrates or harsh environments
      • Manage salts
      • SDI-12 compatible
    • Specifications


      Volumetric water content (VWC)Range
      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)
      0.1 εa (unitless) from 1–20
      <0.75 εa (unitless) from 20–80
      0.002 m3/m3 from 0.0–0.4 m3/m3
      0.001 m3/m3 for >0.4 m3/m3
      Generic calibration: ±0.03 m3/m3 typical
      Medium-specific calibration: ±0.01–0.02 m3/m3
      Apparent dielectric permittivity (εa): 1–40 (soil range),
      ±1 εa (unitless)
      40–80, 15% measurement
      Dielectric measurement frequency70MHz
      Measurement volumeSee comparison article
      TemperatureRange: −40 to +60 °C
      Resolution: 0.1 °C
      Accuracy: ±1 °CNOTE: Temperature measurement, for applicable sensors, may not be accurate if sensor is not fully immersed in the medium of interest, due to longer equilibration time.
      Bulk electrical conductivityRange: 0–25 dS/m
      Resolution: 0.001 dS/m from 0–25 dS/m
      Accuracy: ±5% from 0–5 dS/m
      ±10% from 5–25 dS/mCustom calibration required 10–25 dS/m
      OutputDDI serial or SDI-12 communication protocol
      Data logger compatibilityMETER data loggers (ZL6, EM50/EM60 series) or any data acquisition system capable of 3.6- to 15-VDC power and serial or SDI-12 communication
      DimensionsLength: 9.3 cm (3.7 in)
      Width: 2.4 cm (0.9 in)
      Height: 6.5 cm (2.6 in)
      Needle length5.5 cm (2.2 in)
      Operating temperature rangeMinimum: –40 °C
      Maximum: +60 °CNOTE: Sensors may be used at higher temperatures under certain conditions; contact Customer Support for assistance.
      Cable length5 m (standard)
      75 m (maximum custom cable length)NOTE: Contact Customer Support if a nonstandard cable length is needed
      Connector types3.5-mm stereo plug connector or stripped and tinned wires
      Supply voltage (VCC to GND)Minimum: 3.6 VDC
      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 rateMinimum: 1.0 V/ms
      Current drain (during measurement)Minimum: 0.5 mA
      Typical: 3.0 mA
      Maximum: 30.0 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 durationTypical: 150 ms
      Maximum: 200 ms
      COMPLIANCEManufactured under ISO 9001:2015
      EM ISO/IEC 17050:2010 (CE Mark)
    • Manuals and software
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    5TE Soil Moisture, Temperature, and Electrical Conductivity Sensor (Discontinued: see TEROS 12 sensor)

    5TM Soil Moisture and Temperature Sensor (Discontinued: see TEROS 11 sensor)

    One data logger. No limits.

    Uncomplicated. Almost unbreakable. And Unbelievable.

    One sensor gives you three numbers, instantly

    Hundreds of measurements across vast areas can be exhausting and quickly dissolve an entire research budget. Simplify the process with the TEROS 12.