DFRobot - Gravity: Lab Grade Analog EC / Electrical Conductivity Sensor Kit for Water Quality Monitoring (K=1)

This Gravity analog electrical conductivity sensor kit brings EC measurement to Arduino water testing projects, with a K=1 laboratory-grade probe, a V2 signal conversion board, and calibration solutions included. Recommended for 1–15mS/cm measurements, this EC sensor kit helps compare aqueous samples and track conductivity changes in hydroponic, aquaponic, aquaculture, and environmental water experiments. Gravity and BNC connectors simplify assembly, while the Arduino library provides two-point calibration and conductivity conversion. This laboratory-grade kit is designed for intermittent sampling, making this EC sensor a practical choice for hands-on experiments and DIY water testing instruments.

Calibration Solutions Included for a Complete Two-Point Setup

This EC sensor kit includes two bottles each of 1413µS/cm and 12.88mS/cm standard solution, providing both references required by the Arduino library's two-point calibration method. The library automatically recognizes these two standards during calibration, simplifying the setup process before testing samples. Together with the documented Arduino example, the supplied solutions provide a clear route from initial assembly to calibrated conductivity measurements without sourcing the calibration references separately.

Stable Analog Output with AC Excitation

This analog EC sensor combines hardware output filtering with AC excitation to support stable conductivity readings. Hardware filtering reduces signal jitter, while AC excitation reduces electrode polarization and helps prolong probe life. These V2 improvements support sample comparisons and repeated laboratory measurements, where fluctuating output can make results harder to interpret. The result is a practical sensing foundation for custom EC displays and water testing projects.

Gravity and BNC Connections for Easy Arduino Integration

This EC sensor kit uses a BNC connector for the probe and a Gravity analog cable for the controller connection, allowing assembly without soldering. The V2 board accepts a 3.0–5.0V supply, and Arduino wiring instructions and library examples guide initial setup. A 42mm*32mm board and standardized Gravity interface also simplify mechanical planning when combining this EC sensor with other water quality sensors in a DIY multi-parameter instrument.

• K=1 laboratory-grade probe for intermittent aqueous-solution measurements
• 0–20mS/cm supported detection range; 1–15mS/cm recommended
• Two-point calibration with automatic recognition of 1413µS/cm and 12.88mS/cm standard solutions
• Both calibration standards included, with two bottles of each
• Hardware-filtered analog output to reduce signal jitter
• AC excitation to reduce polarization and help prolong probe life
• 3.0–5.0V supply input with Gravity and BNC connections for assembly without soldering
• Arduino library with temperature compensation using an external temperature measurement
• Standardized board size and connector for multi-sensor project integration

• Intermittent conductivity testing of aqueous samples
• Hydroponic and aquaponic nutrient-solution sampling within the recommended range
• Aquaculture water sample comparisons within the recommended range
• Environmental water sampling and educational EC experiments
• DIY multi-parameter water testing instruments

Signal Conversion Board (Transmitter) V2

• Supply Voltage: 3.0~5.0V
• Output Voltage: 0~3.4V
• Probe Connector: BNC
• Signal Connector: PH2.0-3Pin
• Measurement Accuracy: ±5% F.S.
• Board size: 42mm*32mm/1.65in*1.26in

Electrical Conductivity Probe

• Probe Type: Laboratory Grade
• Cell Constant: 1.0
• Support Detection Range: 0~20ms/cm
• Recommended Detection Range: 1~15ms/cm
• Temperature Range: 0~40°C
• Probe Life: >0.5 years (depending on the frequency of use)
• Cable Length: 100cm

Usage Precautions

• This laboratory-grade probe is for intermittent sampling. Prolonged immersion shortens probe life.
• Avoid touching or rubbing the platinum black coating on the probe electrodes. Rinse the probe with distilled water.
• Calibrate before first use and after an extended period without use.
• Automatic temperature compensation requires a separate temperature measurement; a waterproof DS18B20 sensor can be used.
• The analog output can reach 3.4V. Confirm the controller's ADC input limits before connecting, especially with a 3.3V controller.

• Electrical Conductivity Probe（K=1, Laboratory Grade）   x1
• Signal Conversion Board (Transmitter) V2    x1
• Standard Buffer Solution 1413us/cm x2
• Standard Buffer Solution 12.88ms/cm x2
• Gravity Analog Sensor Cable  x1
• Waterproof Gasket   x2
• Screw Cap for BNC Connector  x1
• M3 * 10 nylon pillar x4
• M3 * 5 screw x8