Pressure instrument|Flow instrument|Level instrument
BINGO SENSOR
Professional pressure, flow, level controlling products supplier!
Coriolis Mass Flowmeter
|
Coriolis Mass Flowmeter
How Coriolis Mass Flowmeter Work
Coriolis mass flowmeter measure the force resulting from the acceleration
caused by mass moving toward (or away from) a center of rotation. This effect can be experienced when riding a merry-go-round, where moving toward the center will cause a person to have to “lean into” the rotation so as to maintain balance. As related to flowmeters, the effect can be demonstrated by flowing water in a loop of flexible hose that is “swung” back and forth in front of the body with both hands. Because the water is flowing toward and away from the hands, opposite forces are generated and cause the hose to twist.
In a Coriolis mass flowmeter, the “swinging” is generated by vibrating the tube(s) in which the fluid flows. The amount of twist is proportional to the mass flow rate of fluid passing through the tube(s). Sensors and a Coriolis mass flowmeter transmitter are used to measure the twist and generate a linear flow signal.
Early Coriolis mass flowmeters were single-tube designs with a U-tube shape similar to the garden hose (described above). These flowmeters could be significantly affected by vibration in all but the smallest sizes. Subsequent designs split the flow into two flow streams and measured the relative twist between the two tubes. These designs were much less susceptible to vibration and allowed Coriolis mass flowmeters to be installed in “normal” piping systems without extensive mechanical supports. Electronic and mechanical improvements allow more recent designs to include single-tube Coriolis mass flowmeters with straight tubes that reduce pressure drop and reduce the probability of plugging.
Most Coriolis mass flowmeters can measure fluid flow, fluid density, and the temperature of the outside wall of the pipe in the flowmeter. Some Coriolis mass flowmeters can also measure the fluid viscosity in some applications while otherCoriolis mass flowmeters can measure two-phase flow accurately.
|
