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Rosemount™ 2051CFA Annubar™ Flow Meter
rosemount 2051cfa annubar flow meter
Featuring industry-standard performance, the Rosemount 2051CFA Annubar Flow Meter provides dependable flow measurements via mulitple communication protocols including WirelessHART® technology.
The patented Annubar sensor design is able to deliver accuracy over a wide flow range, maintain a small profile in the pipe, and provide flow and pressure measurements via a signal pipe penetration. This safety-certified flow meter is engineered with a local operator interface (LOI) for field commissioning.
Rosemount™ 2051CFA Annubar™ Flow Meter


5-year limited warranty
Up to 100:1 (5:1 flow turndown)
Measurement Range
Up to 1000 inH2O (2,48 bar) differential
Line Size
2 to 12 in. (50 to 300 mm)
Differential pressure, scaled variable
Communication Protocol
4-20 mA HART®, WirelessHART®, FOUNDATION™ Fieldbus, PROFIBUS®, 1-5 V Low Power HART®
Process Wetted Material
316 SST
Basic Diagnostics
SIL 2/3 certified to IEC 61508 by an independent 3rd party, NACE®, hazardous location, see full specs for complete list of certifications


  • Patented T-shape Annubar creates a fixed separation point for DP signal improvement over a wider flow rate
  • Complete flow assemblies are leak-tested and calibrated to reduce leak points up to 70% and simplify installation
  • T-shape design of averaging pitot tube ensures very low permanent pressure loss
  • Local operator interface offers easy-to-use menus and built-in configuration buttons for streamlined commissioning
  • Sensor stagnation zone positioned to reduce noise, measurement inaccuracies and keeps particulates from clogging
  • SIL 2/3 certified to IEC 61508 (via 3rd party) and prior-use certificate of FMEDA data for safety installations