Ninety Days of Observation on The Metal Electrodes of a Salinity Sensor for Vannamei Shrimp Farming Purposes

Indonesia is one of the world's largest shrimp producers. As much as 70% of the farmland is still cultivated using traditional concepts, most of which are small-scale farmers with weak economies. Therefore, an affordable water quality sensor for shrimp farming is an absolute necessity for these farmers. This study deals with building a salinity sensor which is one of the water quality parameters. The salinity sensor was constructed using iron as electrodes, which were then used in 3 types of circuit model i.e.: voltage divider, capacitive and Wheatstone using water with 3 different salinity levels. Observations were done for 90 days as the harvest time of Vanamei shrimp. The objective was to identify the best circuit model for accurate salinity measurement using iron electrodes. Among the configurations tested, the voltage divider model gave the most consistent and precise sensing with a highest F-value of 13.25102 and the lowest P-value of 9.78E-05. These findings highlight that iron electrodes, when used with proper circuit design, offer a cost-effective and practical solution for DIY salinity sensors and improving the sustainability of shrimp farming especially farmers with weak economies.