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Gravity: Industrial Analog EC / Electrical Conductivity Meter Kit for Water Quality Monitoring

SKU: SEN0451

DFRobot Gravity Analog Electrical Conductivity Sensor PRO(K=1) measures aqueous solution conductivity for water quality evaluation, used in hydroponics, aquaculture, and environmental water detection. As an upgrade, it has high probe endurance (24/7 monitoring), integrated PT1000 for temperature compensation. Supports 3-5V input, compatible with 3.3V/5V controllers. Hardware-filtered output, AC excitation reduces polarization (improves precision/probe life). Library includes calibration; package has calibration solution, waterproof connector, etc. Industrial-grade, long-term immersion possible. Pair with Arduino + library for quick, solder-free setup.

Angled shot of analog electrical conductivity sensor for water quality monitoring-DFRobot product sku:SEN0451 image.

Downloadable Resources

  • Docs
  • Tech Specs

    • 1. Example Code for Arduino-First Measurement

    Connect all the parts and upload the following code. The measurement data can be viewed through the serial monitor after uploading the program, and the probe is not calibrated at this time. <br/> The default parameters: calibration factor K=1.0, temperature=25°C.

    2. Example Code for Arduino-Temperature Calibration

    This industrial electrical conductivity probe integrates PT1000 RTD that can be used to measure and calibrate liquid temperature easily. The following program adds temperature calibration to the basic measurement.<br/> If you have another type of temperature sensor, or plan to use other temperature data sources, you can also get the temperature directly and fill it into `getEC_us_cm(EC_Voltage, Temp)` in Celsius (°C).

    3. Example Code for Arduino-Calibration for Higher Accuracy

    Calibration is generally required to improve measurement accuracy in practical use due to quality differences among probes. You can follow the steps outlined in this document.

    Reference

    Specification

    • Signal Conversion Board
      | Parameter | Value |
      |----------------------|------------------------|
      | Supply Voltage | 3.3-5.0V |
      | Output Voltage | 0-3V |
      | Probe Connector | BNC |
      | Signal Connector | PH2.0-3Pin |
      | Measurement Accuracy | ±5% F.S. |
      | Dimension | 42mm32mm/1.651.26" |

    • Electrical Conductivity Probe
      | Parameter | Value |
      |--------------------|----------------------------------------|
      | Probe Type | Industrial Grade |
      | Cell Constant | K=1 |
      | Temperature Probe | PT1000 platinum resistance thermometer |
      | Maximum Range | 1-2200μs/cm |
      | Recommended Range | 100-2000μs/cm |
      | Operating Temperature | 0-50℃ (non-freezing) |
      | Operating Pressure | 0.5MPa |
      | Waterproof Level | IP68 |
      | Cable Length | 5m |

    Pinout

    Electrical Conductivity Probe Pro Pinout

    Label Description
    S+ (EC) Probe positive electrode
    S- (EC) Probe negative electrode
    TEMP PT1000 RTD, not polarity sensitive

    Electrical Conductivity Conversion Board Pinout

    Silkscreen Label Description
    - Power GND Power GND
    + Power VCC Support 3.3V-5V power supply
    A Analog output Output range 0V-3V
    S+ Probe positive electrode Connect to probe positive
    S- Probe negative electrode Connect to probe negative

    PT1000 Tmperature Conversion Board Pinout

    Silkscreen Label Description
    - Power GND Power GND
    + Power VCC Support 3.3V-5V power supply
    A Analog output Output range 0V-3V
    T+ RTD positive Connect to PT1000 RTD, not polarity sensitive
    T- RTD negative Connect to PT1000 RTD, not polarity sensitive

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