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METER Legacy Soil Moisture Sensors

METER Legacy Soil Moisture Sensors

    GS3 Ruggedized Soil Moisture, Temperature, & 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

      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 °C
      NOTE: 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/m Custom calibration required 10–25 dS/m
      COMMUNICATION SPECIFICATIONS
      OutputDDI serial or SDI-12 communication protocol
      Data logger compatibilityAny 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 °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 & 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

       
    • Which soil moisture sensor should I choose?

       

       

      Also see article: “Which soil sensor is perfect for you?

    • Soil moisture sensor comparisons
      ANALOG SENSORS
      SENSOREC-510HSGS1
      MEASURESvolumetric water content, dielectric permittivityvolumetric water content, dielectric permittivityvolumetric water content, dielectric permittivity
      VOLUME OF INFLUENCE240 mL1320 mL1430 mL
      DATA LOGGER COMPATIBILITYMETER Em5b, Em50/50G, EM60/60GProCheck, Campbell Scientific*, ECH2O Check METER Em5b, Em50/50G, EM60/60GProCheck, Campbell Scientific*, ECH2O Check METER Em5b, Em50/50G, EM60/60GProCheck, Campbell Scientific*, ECH2O Check 
      MEASUREMENT RANGE0 to 100% VWC0 to 57% VWC0 to 57% VWC
      BEST IFVWC is all that you need.

      You’re establishing a large sensor network.

      You want a large measurement volume.VWC is all that you need.

      You’re establishing a large sensor network.

      You’re installing in the side wall of a trench.

      You need the most rugged sensor available.

      BUT NOT IFYou cannot apply a regulated voltage (only applies to non-METER data loggers).You are measuring in nursery pots.

      You are installing in rocky soil.

      You are installing sensors down bore holes.

       

      DIGITAL SENSORS
      SENSOR5TM5TEGS3MAS-1
      MEASURESvolumetric water content, dielectric permittivity, temperaturevolumetric water content, dielectric permittivity, temperature, electrical conductivityvolumetric water content, dielectric permittivity, temperature, electrical conductivityvolumetric water content
      VOLUME OF INFLUENCE715 mL715 mL160 mL450 mL
      DATA LOGGER COMPATIBILITYMETER Em50/50G, EM60/60G, ProCheck, Campbell Scientific*, SDI-12 capableMETER Em50/50G, EM60/60G, ProCheck, SDI-12 capableMETER Em50/50G, EM60/60G, ProCheck, SDI-12 capableAny logger with 4-m20 mA input (not compatible with METER data loggers or ProCheck)
      MEASUREMENT RANGE0 to 100% VWC

      -40 to 60 °C

      0 to 100% VWC

      -40 to 60 °C

      0 to 23 dS/m

      0 to 100% VWC

      -40 to 60 °C

      0 to 25 dS/m

      0 to 100% VWC

      -40 to 60 °C

      BEST IFMeasure High temperature variability.

      Data must be corrected for temperature effects.

      Using SDI-12.

      You are managing salts in your system.

      You want to use SDI-12.

      You are measuring water content of soilless substrates.

      You need high accuracy EC.

      You are working with a PLC with a 4-20 mA input.

      You need extremely long cable lengths.

      BUT NOT IFN/AYou want to monitor soiless substrates or potting soils.You are installing sensors down bore holes.You want to use METER data loggers or ProCheck.

      You need a low-power system.

      Compatibility and Programming Specifications for Campbell Scientific and Other (non-METER) Data Loggers

      Note: ECH2O sensors are “plug and read” on METER data loggers. You do not need to program any of this information (or ANY information) into a METER logger.

      SENSORCAMPBELL COMPATIBILITYOTHER LOGGERSOUTPUTVOLTAGE REQUIREMENTS
      EC-5CR10X, 21X, 23X, CR1000, CR3000, etc.Any data acquisition system capable of switched 2.5 to 3.6 V excitation and single ended voltage measurement at 12 bit or better resolution. (Note: some people take their chances with resolution as low as 3 bits, but resolution lower than 10 bits will leave the data quite choppy).Voltage, correlated linearly (soil) or polynomially (growing media) with VWC2.5-3.6 V
      10HSCR10X, 21X, 23X, CR1000, CR3000, etc.Any data acquisition system capable of 3-15 VDC excitation and single ended voltage measurement at 12 bit or better resolution.Voltage correlated with VWC, independent of excitation3-15 V
      5TEAny logger with serial I/O (CR10X, CR850, CR1000, CR3000, etc.)Ask a METER representative for an integrator’s guide to interfacing the 5TEDigital ASCIII stream or SDI-123.6-15 V
      5TMAny logger with serial I/O (CR10X, CR850, CR1000, CR3000, etc.)Ask a METER representative for an integrators guide to interfacing the 5TMDigital ASCII Stream or SDI-123.6-15 V
      GS3Any logger with serial I/O (CR10X, CR850, CR1000, CR3000, etc.)Ask a METER representative for an integrators guide to interfacing the GS3Digital ASCII Stream or SDI-123.6-15 V
      GS1CR10X, 21X, 23X, CR1000, CR3000, etc.Any data acquisition system capable of 3-15 VDC excitation and single ended voltage measurement at 12 bit or better resolution.Voltage correlated with VWC, independent of excitation3-15 V
      MAS-1Any logger with 4-20 mA outputAny logger with 4-20 mA output4-20 mA12-32 VDC continuous

    MAS-1 4-20 Milliamp Volume Soil Moisture Sensor

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    • 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
      INTERFACEStandard 4-20 mA analog transmitter
      SUPPLY VOLTAGE12-32 VDC continuous
      OUTPUT CURRENT4 – 20 mA
      OVERVOLTAGE PROTECTIONYes
      SETTLING TIME4 seconds
      WIRINGRed Wire: (+) supply

      Black Wire: (-) output

      Shield: not connected

      SENSOR TYPEVolumetric Water Content (VWC)
      RANGE0-100% VWC typical
      RESOLUTIONDepends on current measurement (data aquistion) 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.
      OUTPUT4-20 mA current proportional to VWC
      SENSOR MEASUREMENT
      INTERVAL
      1 second
      OPERATING ENVIRONMENT
      TEMPERATURE
      -40 to 60 °C*

      *Sensors can be used at higher temperatures under some conditions.  Contact METER for more details.

      PHYSICAL PROPERTIES
      DIMENSIONS
      8.9 cm x 1.8 cm x 0.7 cm
      CABLE2 m or 5 m, 3 wire (22 AWG tinned Red and Black wire, 24 AWG tinned bare wire); custom cable length available upon request.

      Measurement volume: See comparison article

    • Manuals and Software

    RT-1 Rugged Soil Temperature Sensor

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    • 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 COMPATIBILITYEm5b, METER Em50/50G, EM60/60G, ProCheck, Campbell Scientific
      WARRANTYOne year, parts and labor
    • Manuals and Software

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    One sensor gives you three numbers, instantly

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