How does Coriolis mass flow meter work?

2022-02-22
 How does Coriolis mass flow meter work?

Coriolis flow meter working principle is based on the Coriolis Effect. In nutshell, the Coriolis force is one of the forces of inertia that affect tube oscillations. It wriggles like a snake when water flows through it.

When work starts the drive begins to push the tube. Hence, it starts to fluctuate with a certain frequency. The sensors are located on the two sides and record current vibration parameters (without flow).

When the tube is not filled, both ends oscillate in the same phase. On the graph of frequency oscillations, the sinusoidal at the input will be equal to the parameters at the output. 

Tracking the fluctuation's frequency is the main part of the measurement. When a substance, such as a liquid, begins to move through the pipes, the tube experiences additional distortions in frequency due to the inertia of the flow. It happens because the flow interacts with pipe walls. The results may be strongly affected by external vibration. If it cannot be avoided you can use ultrasonic flow meter.

Due to the appearance of additional effects on the walls, the inlet and outlet of the tube starts to vibrate in different phases. Now their sinusoidal oscillations will have a difference in the form of a small shift between them.

Such a difference is called a shift phase and is often referred to as ∆t. The consumption directly depends on this indicator.

 

 


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