MASS FLOWMETER / CORIOLIS FLOWMETER
Coriolis Mass Flowmeters Overview
Coriolis Flowmeters
Coriolis Flow Meter Overview: Coriolis flow meters rely on the Earth’s coriolis effect to measure fluid mass flow rates. Inside of the Coriolis Flowmeter’s flow-body, flow is diverted into two parallel sensor flow tubes which are vibrated in opposition to one another by energizing a drive coil. The phase shift, which is measured by Hall Effect sensors mounted at the sensor tubes’ inlet and outlets, is caused by the Coriolis Effect and is directly proportional to the mass of the media flowing through the tubes. Thus, the Coriolis Flowmeter is a true Mass Flowmeter. For a more detailed discussion of the principle of operation, please go to: http://www.smartmeasurement.com/flow-meters/coriolis/measuring-principle
In addition to providing a direct mass flow reading, the Coriolis Flowmeter offers a number of other advantages. Perhaps the biggest advantage is its’ multi-parameter measurement capability – the Coriolis Meter provides direct mass and volumetric flow rate, process temperature and density readings. It can also provide inferred readings for density dependent parameters such as % water-in-oil, degrees Brix and degrees Baume. Another advantage of the Coriolis Flow is that there is no requirement for pipe straight runs upstream and downstream of the meter.
Smartmeasurement offers Coriolis Mass flowmeters with several unique tube arrangements including U-Shaped Flow Meters, Micro Bend Tube (MB) or Delta Tube (DT) to provide a best fit mass flow meter for our customers’ unique applications. With this combination of product offerings, pipe diameters from ¼” to 8” and flow rates ranging from as low as 25 kg/hr up to 1,000,000 kg/hr can be accommodated. The unique combination of features and benefits offered by the ALCM family of Coriolis Flowmeters makes it an ideal choice for applications that are found in a variety of industries including Food & Beverage Industry Flow Meters, Petrochem, Oil & Gas Industry Flow Meters, Paint, and Industrial Process Control.
A mass flow meter, also known as an inertial flow meter is a device that measures mass flow rate of a fluid traveling through a tube. The mass flow rate is the mass of the fluid traveling past a fixed point per unit time.
The mass flow meter does not measure the volume per unit time (e.g., cubic meters per second) passing through the device; it measures the mass per unit time (e.g., kilograms per second) flowing through the device. Volumetric flow rate is the mass flow rate divided by the fluid density. If the density is constant, then the relationship is simple. If the fluid has varying density, then the relationship is not simple. The density of the fluid may change with temperature, pressure, or composition, for example. The fluid may also be a combination of phases such as a fluid with entrained bubbles.
Operating principle of a coriolis flow meter
There are two basic configurations of coriolis flow meter: the curved tube flow meter and the straight tube flow meter. This article discusses the curved tube design.
A rotating mass flow meter to illustrate the operating principle of the vibrating mass flow meter.
double sized version
When fluid is flowing through the tubes, the tubes twist slightly.
double sized version
The animations on the right do not represent an actually existing coriolis flow meter design. The purpose of the animations is to illustrate the operating principle, and to show the connection with rotation.
Fluid is being pumped through the mass flow meter. When there is mass flow, the tube twists slightly. The arm through which fluid flows away from the axis of rotation must exert a force on the fluid, to increase its angular momentum, so it bends backwards. The arm through which fluid is pushed back to the axis of rotation must exert a force on the fluid to decrease the fluid's angular momentum again, hence that arm will bend forward.
In other words, the inlet arm is lagging behind the overall rotation, and the outlet arm leads the overall rotation.
MASS FLOWMETER / CORIOLIS FLOWMETER
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