STROEMNINGSMAALER TIL ROER MED LILLE DIAMETER

摘要

A vortex flow meter for pipes of small diameter comprises a small-diameter flow pipe cast integrally with a vortex- shedding bar and an external sensor housing. The outer surface of the housing is formed with an approximately circular recess extending towards the flow pipe and communicating with the interior of the pipe through side- by-side impulse ports located adjacent to one end of the vortex-shedding bar. Inserted into the central region of the recess is a sensor body having diaphragms on both sides to respond to vortex pressure fluctuations transmitted through the impulse ports to chambers along the sides of the sensor body. The sensor body comprises an oil-filled capsule with the diaphragms serving to transmit the pressure fluctuations to a piezo-electric sensor element which produces corresponding electrical signals. <IMAGE>