The Prisma Instruments DUS-D doppler ultrasonic flowmeter has been designed to measure the volumetric flow rate of liquids loaded with particles or air bubbles in suspension (minimum 100 μm and concentration greater than 75 ppm), as well as two-phase liquids causing an emulsion. The measurement is non-intrusive thanks to transducers that can measure in closed conduits ranging from DN40 to DN4000, The ultrasonic flowmeter with doppler effect displays flow and totalization measurements. It can be equipped with 4-20mA outputs, totalization or alarm relays.