Rosemount CMF Mass Flow Sensor

Rosemount CMF Mass Flow Sensor


Ultimate real world performance

Unchallengeable ELITE performance on liquidmass flow, volume flow, and density measurements

Best-in-class gas mass flow measurement
Reliable two-phase flow measurement for the most challenging applications
Designed to minimize process, mounting, and environmental effects

Best fit-for-application
Scalable platform for the widest range of line size and application coverage including hygienic,
cryogenic, high pressure, and high temperature Available with the broadest range of I/O offerings
highlighted by expansive digital protocol support

Superior measurement confidence
Smart Meter Verification delivers complete, online verification of device health and performance, continuously or on-demand at the press of a button
Globally leading ISO/IEC 17025 calibration facilities offers best in class uncertainty of ±0.014%
Intelligent sensor design mitigates the need for zero calibration in the field


Measurement principles
As a practical application of the Coriolis effect, the Coriolis mass flow meter operating principle involves inducing a vibration of the flow tube through which the fluid passes. The vibration, though it is not completely circular, provides the rotating reference frame which gives rise to the Coriolis effect. While specific methods vary according to the design of the flow meter, sensors monitor and analyze changes in frequency, phase shift, and amplitude of the vibrating flow tubes. The changes observed represent the mass flow rate and density of the fluid.

Mass flow measurement
The measuring tubes are forced to oscillate producing a sine wave. At zero flow, the two tubes vibrate in phase with each other.
When flow is introduced, the Coriolis forces cause the tubes to twist resulting in a phase shift. The time difference between the waves is measured and is directly proportional to the mass flow rate.


Performance specifications

Reference operating conditions
For determining the performance capabilities of our meters, the following conditions were observed/utilized:
Water at 68 to 77 °F and 14.5 to 29 psig (20 to 25 °C and 1 to 2 barg)
Accuracy based on industry leading accredited calibration stands according to ISO 17025
All models have a density range up to 5 g/cm3 (5000 kg/m3)

Accuracy and repeatability on liquids and slurries

Liquid flow rates
Nominal flow rate
Micro Motion has adopted the term nominal flow rate, which is the flow rate at which water at reference conditions causes approximately 14.5 psig (1 barg) of pressure drop across the meter.