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

Reference

Last revision 2026/01/12

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Principle

Conductivity is the reciprocal of an object's resistivity. It represents a material’s ability to pass a current. In a liquid, conductivity is a measure of a solution’s ability to conduct electricity and can reflect the amount of dissolved or salinity of a water source, so it’s an important parameter in water quality monitoring.

Other Supplementary Information

Advice for Improving Accuracy

  • Before and after the measurement of each solution, rinse the probe with clean water and wipe it to remove excess water to prevent cross-contamination.
  • Ensure the air bubbles trapped in the probe head have been totally eliminated before calibration and reading.
  • Use a low-ripple linear power supply or battery to power the Arduino or external ADC connected to the sensor. Voltage fluctuations from the PC USB interface power supply may cause unstable measurement results.

Appendix

Prepare Electrical Conductivity Calibration Solution

1413µs/cm electrical conductivity calibration solution is 0.0100mol/L KCl standard solution. The preparation steps of the sample solution of 1000ml volumetric flask are as follows:

  1. According to the calculation, it takes 0.74551g of KCl to prepare 1000ml of 0.01mol/L KCl standard solution.
  2. Use an analytical balance to weigh 0.74551g of dry KCl.
  3. Put the weighed KCl solute into a beaker and add an appropriate amount of distilled water to dissolve KCl completely
  4. Transfer the solution along a glass rod to the volumetric flask, rinse the beaker several times with distilled water, and transfer the rinsing solution to the volumetric flask as well.
  5. When the level of the liquid in the volumetric flask is about 1-2cm away from the mark, use a dropper to add water carefully until the concave surface of the liquid is tangent to the mark.
  6. Cover the bottle tightly with a stopper, and make the liquid in the bottle be mixed well by reversing and shaking.
    The solution is the standard solution with a conductivity of 1413µs/cm at 25℃ in general.

The standard solution should be prepared using an analytical balance and a volumetric flask. Don't use non-precision tools such as measuring cups and graduated cylinder. An inaccurate calibration solution will seriously affect calibration accuracy.

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