Multiphase mass flow meter with variable venturi nozzle

摘要

An insert device for narrowing a throat of a Venturi based multiphase flow meter is shaped to be inserted in the throat. The insert comprises an entrance window and an exit window for a radiation beam generated at a periphery of the throat. The insert allows pressure takeoff to be made in a conventional way. Several examples of insert device are described including a rod, a tubular and a tuning fork insert.