Total dissolved solids (TDS) measurements are crucial for desalination processes, as they affect water quality, operational efficiency, and environmental sustainability. This paper presents a novel solution that uses a differential pressure (DP) transmitter to measure TDS in desalination plants. The proposed method uses a dual-leg setup, with one leg filled with distilled water as a reference and the other with saline water (sample). The DP transmitter measures the pressure difference between th