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Mass Flow Sensor

Mass Flow Sensor


Ultimate real world performance

 Unchallengeable ELITE performance on liquid
 mass flow, volume flow, and density
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
Intelligent sensor design mitigates the need for
zero calibration in the fiel

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.


Density measurement

The measuring tubes are vibrated at their natural frequency. A change in the mass of the fluid contained inside the tubes causes a
corresponding change to the tube natural frequency. The frequency change of the tube is used to calculate density.


Temperature measurement
Temperature is a measured variable that is available as an output. The temperature is also used internal to the sensor to compensate
for temperature influences on Young’s Modulus of Elasticity.


Meter characteristics


Measurement accuracy is a function of fluid mass flow rate independent of operating temperature, pressure, or composition.
However, pressure drop through the sensor is dependent upon operating temperature, pressure, and fluid composition.
Specifications and capabilities vary by model and certain models may have fewer available options. Please refer to the Online
Store Sizing and Selection Tool at the Micro Motion web site (
www.micromotion.com/onlinestore) for detailed information
regarding performance and capabilities.

All meters with the CMF designation (CMF, CMFHC, CMFS) are members of the ELITE meter family and should be considered to
possess the same qualities and specifications as other ELITE family meters unless specifically noted.
The letter at the end of the base model code (for example, CMF100M) represents wetted part material and/or application
designation: M = 316L stainless steel, L = 304L stainless steel, H = nickel alloy C22, P = high pressure, A = high temperature 316L
stainless steel, B = high temperature nickel alloy C22, Y = Super Duplex (UNS S32750). Detailed information about the complete
product model codes begins on page 25.