A wired CTD consists of a receiver (onboard station) and a sensor (submersible station) connected by a coaxial cable, allowing real-time monitoring of measurements onboard the vessel. Although the sensor is sometimes used alone, it is often used in combination with a water sampling device as a "CTD water sampling system" to accurately collect seawater at the desired depth while checking the CTD's pressure sensor values. In addition, by comparing the measured values obtained by the sensor with the analyzed values of the collected seawater, it is possible to correct the sensor output values and confirm that there are no water sampling malfunctions or analysis errors.
The size of a CTD water sampling system varies depending on the number and capacity of water samplers. The larger the system, the more personnel are required for observation work, and the more difficult it is to work safely in rough weather.
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