1.Coriolis mass flowmeter
There are two types of mass flow measurement: direct (direct measurement of fluid mass flow) and indirect (measurement of mass flow through a combination of volume flowmeters and densitometers). Coriolis mass flowmeters are direct type.
2. Working principle
The fluid enters the mass flow meter, and there are two sections of the fluid with countercurrent at both ends. By giving the pipeline a certain frequency of vibration (rotational angular velocity), the Coriolis force generated will form a torque, which is proportional to the passing mass, so the mass flow rate of the fluid through the pipeline can be measured.
The Coriolis force is a hypothetical force generated by inertia in a rotating reference frame, which is used to describe the deviation of an object's motion path. The direction of the Coriolis force is perpendicular to the direction of the object's motion and the direction of the axis of rotation. For example, in a rotating system like Earth, the Coriolis force has a significant effect on atmospheric and ocean flows. The Coriolis force deflects the wind to the right in the northern Hemisphere and to the left in the Southern Hemisphere. This deflection effect plays a key role in the formation of cyclones and anticyclones.
3. Coriolis mass flowmeter characteristics
① High measurement accuracy, direct measurement of mass flow, not affected by temperature, pressure factors.
② Sensitive to external vibration interference, the vibration of the pipeline should be eliminated.
③ The gas-liquid mixture or low-density gaseous fluid can not be measured, so the gas-liquid mixture in the pipe should be avoided during installation. For liquid media, the flow meter should be in the vertical pipe section/low point to avoid back pressure vaporization or pipeline dissatisfaction; For the gas medium, the flowmeter cannot be placed at a local low point to avoid the measurement error caused by the accumulation of liquid in the measuring tube.
④There is no requirement for the front and back straight pipe sections;
⑤ The price is expensive;
⑥Before and after the installation of the globe valve, convenient for zero correction.
