High salinity is a risk factor for the development of AGD (amoebic gill disease). Thus it is important to monitor the salinity levels on site.
The AOS conductivity/salinity sensor utilizes the so-called inductive method, where a ring-type coil is excited at fixed intervals and the response is retrieved on a second coil, which is linked to the excited coil. The connectivity between the coils (determined by the degree of conductivity) takes place via the conducting solution, which is the water. The huge advantage of this method is that it requires less maintenance than traditional conductivity sensors. It is also more robust to biofouling, and it always returns back to its original calibration once it is cleaned.
Another advantage with the AOS conductivity/salinity sensor is that the opening is larger in diameter than with most other sensors of the same type. This facilitates easier and faster cleaning routines.
The calibration and history data are stored within the sensor, and this allows for “plug and play” use, without any re-calibration. The AOS conductivity/salinity sensor connects to the Autonomous Online System (AOS). Through this the operators on the barges, as well as those monitoring the conditions on shore will get immediate information about trends and sudden changes in the salinity levels in the cages.