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Ellipse® AF Annular Flanged Flow Meter

Ellipse® AF Annular Flanged Flow Meter

The Ellipse® Model AF annular flanged flow device is a multi-ported, self-averaging differential pressure flow element. Its innovative elliptical shape provides the lowest permanent pressure loss in the industry. The Ellipse flow meter is designed with a series of ports facing the upstream velocity pressures and flow sensing ports strategically located ahead of the trailing edge flow separation.


  • Elliptical design outperforms traditional devices
  • Turndown Ratio: 17:1; no vacuum effects
  • No moving parts equals long, trouble-free service life
  • True static pressure measurement rather than a calculated value
  • Overcomes loss of accuracy caused by fluid separation at the sensor body


  • T-Type head, 316 SS 1/4" or 1/2" FNPT connection
  • 150 lb 316 SS sensor flange
  • CS gasket with SS spiral wound ring
  • CS mounting flange, 150 lb ASTM A105 with nuts and bolts
  • CS 3000 lb weld fitting - ASTM A105
  • 316 SS Ellipse® sensor
  • Instrument valves (2 per sensor) - 1/2", CS
  • 316 SS ID tag with wire
  • Optional: Double support, CS or 316 SS
  • Optional: Spiral wound gasket, 316 SS
  • Optional: 300 lb, 600 lb, and higher flange rating, CS or 316 SS ANSI B16.5
  • Optional: Temperature port with RTD output
  • Optional: Static pressure port with SS plug



2…120 in.
Temperature Range
Up to 800 °F
Flow Range
5.3…34,340 gpm
Pressure Range
Up to 800 PSI
±0.75 %

Additional Specifications

Application Examples


Building Automation / HVAC
Petrochemical, Refining & Chemical Metering
Oil & Gas
Process or Industrial

Product Resources

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