Fluid phase (liquid, gas, slurry), viscosity, density, and corrosiveness.
HART remains the most widely deployed automation protocol, supported by virtually every host system and every major manufacturer of process automation instrumentation. HART superimposes a digital communication signal on the standard 4–20 mA analog current loop, enabling backward compatibility with existing analog infrastructure while adding digital capabilities.
Radar technologies have largely replaced older mechanical float systems due to their lack of moving parts and resistance to changes in fluid density.