Main Article Content
Online salinity meter for water environment is one of the most important equipment in monitoring and managing the water environment for aquaculture farms. The weakness of salinity meters currently used in the market is the use of direct contact via ion exchange membranes to the water environment through sensor electrodes. With this method, over time, the electrodes will become dirty and corroded the electrode causing a large measurement error. To overcome this drawback, we propose a more efficient method to measure water salinity. The proposed method uses an ultrasonic sensor to measure the height of the buoy that floats to the surface of the water, thereby using Archimes's law to interpolate the water salinity. This method has a characteritic that the sensor electrode does not contact directly with the water environment. Therefor, designed salinilty sensor will not be corroded the electrode, unaffected by frowning from water environmental, so it has high durability and accuracy.