Coriolis Flow Meter Principle
firstname.lastname@example.org Coriolis mass flow meters can directly measure the mass flow of fluids, and the measurement results are less affected by the characteristics of medium density, temperature, pressure, and flow rate distribution.
It has high measurement accuracy, good stability, easy use, and low maintenance. It has strong communication function and can realize multi-parameter measurement. It has been widely used in production process control and other fields.
Today Shanghai Cixi Instrument Co., Ltd. will introduce you to the principle and composition of Coriolis mass flow meter.
1 The principle and composition of mass flow meters
1.1 Principle of mass flow meter
The principle of Coriolis mass flow meter mass measurement is Newton's second law F=Ma. When the fluid flows in the vibrating tube, it will produce Coriolis force proportional to the mass flow . When there
is no fluid flowing, the vibrating tube will not be twisted, and the signals detected by the electromagnetic signal detectors on both sides of the vibrating tube are in the same phase; when there is fluid passing,
the vibrating tube will be twisted under the action of torque, and there will be a presence between the two detectors Phase difference. The transmitter measures the lag time between the left and right detection signals.
This time difference is multiplied by the flow calibration coefficient to determine the mass flow.
The density measurement principle of the Coriolis mass flowmeter is that the vibration frequency is inversely proportional to the square root of the fluid density, and the fluid density is determined by measuring the vibration
frequency. Therefore, the mass flow meter can realize the measurement of the fluid mass flow rate and the density of the fluid.
1.2 The composition of mass flow meters
The Coriolis mass flowmeter consists of a sensor and a transmitter. The transmitter is used for signal processing, and the two are connected by a dedicated 9-core cable.
The composition of the mass ﬂow meter
The structure of the sensor has various forms such as straight tube, U-shaped tube, Ω type, etc.
The U-shaped tube sensor is selected for the feed control of the cracking furnace. The two open ends of the U-shaped tube are connected with the pipeline, and the fluid flows in from one port and flows out from the other port.
An electromagnetic device is installed on the top of the U-shaped tube to excite the U-shaped tube to vibrate at the natural natural frequency with the center as the axis, and the natural vibration direction is perpendicular to the
plane where the U-shaped tube is located; after the fluid flows into the U-shaped tube, And move vertically with the pipeline when flowing along the pipeline. In addition, when the fluid flows through the U-shaped tube, a Coriolis
acceleration will be generated, and it will react to the U-shaped tube in the form of Coriolis force. The flow direction of the fluid at the inlet and outlet of the U-shaped tube is opposite, forming a moment of force, which causes the
U-shaped tube to be twisted . The torsion angle is related to the mass flo w of the fluid passing through the U-shaped tube. The measuring tube is measured by an electromagnetic detector. The distortion becomes an electrical signal,
which is sent to the transmitter for further processing.
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