Research on expendable seawater conductivity measurement system

A set of microcontroller-based seawater conductivity measurement system is introduced, which is a part of the Expendable Conductivity, Temperature, Depth profile measurement equipment in the domestic research at present. In the hardware and software design, temperature compensation and low temperature drift rectifier filtering techniques are used to overcome the impact on the sensor and circuit, because of 40 degrees temperature changes in seawater. At the same time, under the DDS principle, a configuration is made on the microcontroller to output high-stability sine wave. The experiment proves that the accuracy for the seawater conductivity measurement system reaches ±0.077 mS/cm.