SPG instruments are pressure gauges explicitly designed for local-level indication. While primarily used on cruise ships, they are increasingly being developed for the local indication of water, urea, and diesel levels in the tanks of various other types of vessels. Accurate local level readings
The Spriano SST70 series transmitter measures liquid levels, density, and interface levels in open and closed tanks. It converts the hydrostatic thrust exerted by a displacer immersed in a liquid into a current signal proportional to the measured level through a mechanical force