Coriolis mass flow meter

A Coriolis mass flow meter is an instrument that determines flow rate by measuring the vibration frequency of the fluid being measured in the measurement tube. The natural frequency of a measurement tube refers to the frequency at which it vibrates naturally when no fluid is flowing through it; it is influenced by factors such as the elasticity, density, and diameter of the tube itself. Ideally, the natural frequency of the measuring tube should remain constant. However, when the density of the fluid under test changes, it has a certain effect on the natural frequency. This is because changes in density cause the fluid’s resistance to the measuring tube to change, which in turn alters the vibration state of the tube and ultimately affects its natural frequency. Therefore, in practical use, the accuracy of Coriolis mass flow meters is affected by changes in fluid density. To improve the accuracy of measurements, it is necessary to fully consider the density range of the fluid being measured during design, and to employ appropriate measurement methods and algorithms to eliminate the effects of density variations. .

How is the formula for the natural frequency affected by density determined?