SONARtrac process monitoring systems are versatile process measurement tools capable of providing multi-variable measurements, such as volumetric flow, speed of sound, and entrained air, in a wide variety of fluid regimes; liquids, gases, slurries and multiphase fluids. SONARtrac flow systems utilize passive sonar techniques, is a robust; full bore clamp-on solution and is scalable to large pipe diameters. This means that there is no restrictions to the flow, no need to cut the pipe and therefore no process downtime or disruptions.