CALDON LEFM 280CiRN Ultrasonic Flow Meter DatasheetSource: Cameron
Measuring oils having high viscosity and/or low flow conditions may involve operating at Reynolds numbers below 8,000, in the laminar and transition flow regimes. Full bore ultrasonic flow meter performance has traditionally degraded for Reynolds numbers below 8,000 because the liquid velocity profile erratically switches between laminar and turbulent characteristics. Cameron has developed the LEFM 280CiRN ultrasonic flow meter with a reduced bore, modeled after flow nozzle technology, in which the liquid velocity profile is stabilized in the throat by forces much larger than the forces imposed by fluid viscosity. The meter design stabilizes the flow profile while preventing boundary layer separation under all operating conditions, greatly improving performance.