®
METER Legacy Soil Moisture Sensors

METER Legacy Soil Moisture Sensors

    GS3 Ruggedized Soil Moisture, Temperature, and Electrical Conductivity Sensor

    • Get pricing
    • Picture

    • 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

      SPECIFICATIONS

      MEASUREMENT 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)
      Resolution
      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
      Accuracy
      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
      COMMUNICATION SPECIFICATIONS
      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
      PHYSICAL SPECIFICATIONS
      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
      ELECTRICAL AND TIMING CHARACTERISTICS
      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
    • Video

       

    5TE Soil Moisture, Temperature, and Electrical Conductivity Sensor

    • Get pricing
    • Picture

      ECH2O 5TE | Soil Moisture, Temperature & Electrical Conductivity Sensor | METER

    • Description

      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

      • 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

       

    • Specifications

      SPECIFICATIONS

      MEASUREMENT 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)
      Resolution:
      0.0008 m3/m3 from 0%–50% VWC
      Accuracy:
      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
      TemperatureRange: –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 volumeSee comparison article
      COMMUNICATION SPECIFICATIONS
      OutputDDI serial or SDI-12 communication protocol
      Data logger compatibilityMETER data loggers (ZL6, EM50/60 series) or any data acquisition systems capable of 3.6- to 15.0-VDC power and serial or SDI-12 communication
      PHYSICAL SPECIFICATIONS
      DimensionsLength: 10.9 cm (4.3 in)
      Width: 3.4 cm (1.3 in)
      Height: 1.0 cm (0.4 in)
      Prong length5.0 cm (1.9 in)
      Operating temperature rangeMinimum: –40 °C
      Maximum: +60 °C

      NOTE: 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
      ELECTRICAL AND TIMING CHARACTERISTICS
      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 rateMinimum: 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 durationTypical: 150 ms
      Maximum: 200 ms
      COMPLIANCEManufactured under ISO 9001:2015
      EM ISO/IEC 17050:2010 (CE Mark)
    • Manuals & software

    5TM Soil Moisture and Temperature Sensor

    • Get pricing
    • Picture

      ECH2O 5TM | Soil Moisture and Temperature Sensor | METER

       

       

    • Description

      Temperature integrated with soil moisture

      The 5TM delivers temperature, measured by an onboard thermistor, along with accurate volumetric water content.

      Engineered for accuracy

      The 5TM determines volumetric water content (VWC) by measuring the dielectric constant of the soil (or other media) using capacitance/frequency domain technology. The sensor uses a 70 MHz frequency, which minimizes salinity and textural effects, making the 5TM accurate in most soils and soilless media. Factory calibrations are included for mineral soils, potting soils, rockwool, and perlite.

      Easy installation

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

      Plug and read

      Get straight to the data with the new ZL6 data logger. Just install the 5TM, plug it into the ZL6, set the clock and measurement intervals, and start logging data. No programming required.

      Easy integration

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

      Advantages of the 5TM

      Features

      • Measures VWC and soil temperature
      • SDI-12 compatible
      • Easy installation
      • Plug and play with METER data loggers
      • Use with the ZL6 data logger to collect data remotely
      • 70 MHz frequency minimizes salinity and textural effects
      • Factory calibrations are included for mineral soils, potting soils, rockwool, and perlite
    • Specifications

      SPECIFICATIONS

      MEASUREMENT 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)
      Resolution:
      0.0008 m3/m3 from 0%–50% VWC
      Accuracy:
      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
      TemperatureRange: –40 to +60 °C
      Resolution: 0.1 °C
      Accuracy: ±1 °C
      Measurement volumeSee comparison article
      COMMUNICATION SPECIFICATIONS
      OutputDDI serial or SDI-12 communication protocol
      Data logger compatibilityMETER data loggers (ZL6, EM50/60 series) or any data acquisition systems capable of 3.6- to 15.0-VDC power and serial or SDI-12 communication
      PHYSICAL SPECIFICATIONS
      DimensionsLength: 10.9 cm (4.3 in)
      Width: 3.4 cm (1.3 in)
      Height: 1.0 cm (0.4 in)
      Prong length5.0 cm (1.9 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
      ELECTRICAL AND TIMING CHARACTERISTICS
      Supply voltage (VCC to GND)Minimum: 3.6 VDC
      Maximum: 15.0 VDC
      Power line slew rateMinimum: 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 durationTypical: 150 ms
      Maximum: 200 ms
      COMPLIANCEManufactured under ISO 9001:2015
      EM ISO/IEC 17050:2010 (CE Mark)
    • Manuals and software

    MAS-1 4-20 Milliamp Volume Soil Moisture Sensor

    • Get Pricing
    • Picture

       

    • Description

      4-20 Milliamp output, ultra-long cable lengths

      The MAS-1 4-20 milliamp sensor is the first current-based sensor to use METER’s trademark 70 MHz technology. This sensor offers a standard 4-20 milliamp output that is common with PLCs and irrigation controllers.  With the 4-20 mA interface, cable lengths over 250 feet are possible.

      Research grade accuracy

      The MAS-1 determines volumetric water content (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 MAS-1 accurate in almost any soil or soil-less media. Factory calibrations are included for mineral soils, potting soils, and rockwool.

      Low cost individual sensors for large sensor networks

      The MAS-1 delivers research-grade accuracy at a price that makes large sensor networks economically practical. You can adequately characterize your site with sensors at multiple depths and locations, even if you’re on a tight budget.

      Advantages of the MAS-1

      • 4-20 milliamp sensor
      • Allows for cable lengths greater than 250 feet
    • Specifications
      MEASUREMENT SPECIFICATIONS
      Volumetric water content (VWC)
      • Range: 0−0.57 m3/m3 , calibration dependent (0–100% VWC possible with custom calibration)
      • Resolution: Depends on current data acquisition device
      • Accuracy: 6% VWC with generic calibration for supported growing media up to 65% VWC, above which accuracy lessens
      • Increased accuracy can be achieved with a medium-specific calibration. Contact Customer Support.
      Dielectric measurement frequency70 MHz
      COMMUNICATION SPECIFICATIONS
      Output4–20 mA current proportional to VWC
      Data logger compatibilityData acquisition system capable of constant 12–32 VDC supply and 4–20 mA current measurement.
      PHYSICAL SPECIFICATIONS
      Dimensions
      • Length: 8.9 cm (3.5 in)
      • Width: 1.8 cm (0.7 in)
      • Height: 0.7 cm (0.3 in)
      Prong length5 cm (1.97 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)
      • 40 m (maximum custom cable length)

      NOTE: Contact Customer Support if a nonstandard cable length is needed or if cables longer than 40 m are desired

      Connector typesStripped and tinned wires
      ELECTRICAL AND TIMING CHARACTERISTICS
      Supply voltage (VIN to GND)
      • Minimum: 12 VDC continuous
      • Maximum: 32 VDC continuous
      Power line slew rateMinimum 1.0 V/ms
      Measurement durationTypical 1.0 s
      COMPLIANCE
      • Manufactured under ISO 9001:2015 EM I
      • SO/IEC 17050:2010 (CE Mark)
      • 2004/208/EC; 2011/65/EU
      • EN61326-1:2013; EN61321:2009
      Measurement volumeSee comparison article

      Power rise time: The MAS-1 will operate with a power supply from 12 to 32 V. It will perform best when powered with a square power curve. If the rise time to reach the supply voltage is too long, the MAS-1 can experience measurement processing problems. METER recommends reaching the target power supply voltage within 10 ms for best performance. Refer to Figure 3 for an ideal power curve for the MAS-1.

      Figure 3. Recommended rise time for MAS-1 power supply
    • Manuals and Software

    RT-1 Rugged Soil Temperature Sensor

    • Get pricing
    • Picture

    • Description

      Measure soil temperature

      The rugged RT-1 soil temperature sensor is an easy-to-use sensor for measuring the temperature of soil or other materials.

      Weatherproof for long-term use

      This sensor is stainless steel, completely water proof, submersible, and designed for continuous outdoor use.

      Plug and play technology

      This rugged temperature sensor can be used with the Em5b and Em50 data logger series. To measure volumetric water content and temperature, we recommend using the 5TM, 5TE, or GS3 sensor.

    • Specifications
      TEMPERATURE ACCURACY-40° to -20°C: ± 1.0°C

      5° to 40°C: ± 0.5°C

      40° to 50°C and -20 to 5°C: better than ± 1.0°C

      TEMPERATURE RESOLUTION0.1°C
      TEMPERATURE RANGE-40° to 80°C
      SENSOR TYPEThermistor
      OPERATING ENVIRONMENT-40° to 80°C
      CABLE LENGTH5 m
      CABLE CONNECTOR TYPES3.5 mm “stereo” plug
      SENSOR DIMENSIONS2 cm x .075 cm
      DATA LOGGER COMPATIBILITYMETER ZL6,  Em50/50G, EM60/60G, Em5b, ProCheck, Campbell Scientific
      WARRANTYOne year, parts and labor
    • Manuals and Software

    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.