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Salinity meter | For use in rivers and river mouth weirs

A salinity meter that measures electrical conductivity and water temperature and performs calculations to determine practical salinity

This salinity meter was developed to perform salinity monitoring for river mouth weirs and rivers. It automatically measures the changes in river salinity caused by seawater. They can be installed in measurement stations or on floats to measure upstream salinity intrusion at various depths in multiple measurement stations. The data acquired from the meter can be transmitted over wires (such as optical fiber cables) or wirelessly (using industrial telemeters, specified low power radio transmission, Wi-Fi, etc.) to management facilities, where it can be used in various systems.

  • Unlike typical electrode-based designs, it uses electromagnetic induction to perform measurement, so it can produce stable results even in rivers where there are issues with biofouling, etc.
  • Multiple units can be connected to perform measurement over a broad range of layers, from lower to upper river layers.

monitoring device

Measurement Accuracy

Item Practical salinity Electrical conductivity Water Temperature Chlorine content(cl)
Range 2~42 PSU 0~60 mS/cm -10~40 °C 1200~23000 ppm By calibration curve
Accuracy ±0.3 PSU
  • ±0.03 mS/cm (0~1 mS/cm)
  • ±0.30 mS/cm (1~60 mS/cm)
±0.1 °C
±200 ppm
By calibration curve
Method Calculated from electrical conductivity and water temperature Electromagnetic induction method Thermistor Conversion from practical salt Low concentration range is converted by calibration curve
  • The above specification values are reference values, and are subject to change without prior notice.