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