Bronkhorst

Coriolis mass flow measuring principle

A Mass Flow Meter operating on the "Coriolis principle" contains a vibrating tube in which a fluid flow causes changes in frequency, phase shift or amplitude. The sensor signal is fed into the integrally mounted pc-board. The resulting output signal is strictly proportional to the real mass flow rate, whereas thermal mass flow meters are dependent of the physical properties of the fluid. Coriolis mass flow measurement is fast and very accurate.

Schematic of a Coriolis flow sensor
Schematic of a Coriolis flow sensor

Video: Principle of operation of mini CORI-FLOW Coriolis Mass Flow Meter for GAS and LIQUID

In this video Bronkhorst, manufacturer of the world's smallest Coriolis flow meters, presents the mechanism of a Coriolis mass flow meter from the mini CORI-FLOW series. The video also explains how the flow can be adjusted quickly and precisely through the combined use of a Coriolis mass flow meter and a gear pump.


Coriolis versus Thermal Mass Flow for Gases and Liquids

  • Fluid independent flow measurement and control - no need for recalibration
  • Gas and liquid can be measured with the same sensor
  • Ability to measure undefined or variable mixtures
  • Suitable for supercritical fluids (e.g. CO2, C2H4)
  • Same compact footprint
  • High accuracy ± 0.2% of rate ± zero stability for liquids ± 0.5% of rate ± zero stability for gases
  • Large turndown range of up to 1:2000
  • Fast sensor response time: down to 50...100 msec


Selection of Bronkhorst Coriolis Mass Flow Meters & Controllers for GAS and LIQUID:


Bronkhorst High-Tech B.V.

Nijverheidsstraat 1A
NL-7261 AK Ruurlo (NL)
Tel. +31 573 45 88 00
[email protected]

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