It is used to measure the volumetric flow rate of conductive fluids. Below is a detailed introduction to the Magnetic Flowmeter:
Working Principle
- According to Faraday’s law of electromagnetic induction, when a conductive fluid flows through a magnetic field that is perpendicular to the direction of flow, the free charges in the fluid are deflected by the Lorentz force, creating a potential difference, or induced electromotive force (emf), across the fluid.
- The magnitude of the induced emf is directly proportional to the fluid velocity. By measuring the induced emf and combining it with the known pipe diameter and magnetic flux density, the volumetric flow rate of the fluid can be calculated.
Main Components
- Measurement Tube: Typically made of non-magnetic materials, with an insulating lining on the inner wall.
- Magnetic Circuit System: Generates a stable magnetic field, which can be an electromagnet or a permanent magnet.
- Electrodes: Located on the inner wall of the measurement tube, used to detect the induced emf.
- Signal Processing Unit: Amplifies and filters the weak signals detected by the electrodes and calculates the flow rate.
- Display and Output Unit: Displays instantaneous flow rate and cumulative flow rate, and can output through analog or digital signals.
Advantages
- No Moving Parts: Reduces mechanical wear, increases reliability, and lowers maintenance costs.
- High Accuracy: Typical accuracy can reach ±0.5% R.
- Wide Application Range: Suitable for corrosive and high-viscosity fluids, unaffected by fluid viscosity and density.
- Low Pressure Loss: Minimal resistance to fluid flow.
Limitations
- The fluid must have a certain level of electrical conductivity, typically greater than 5μS/cm.
- Requires a full pipe condition; otherwise, measurement accuracy will be affected.
Application Fields
The Magnetic Flowmeter is widely used in water treatment, chemical, food, and pharmaceutical industries, especially for measuring conductive liquids such as wastewater, sewage, acid and alkali solutions, and slurries.
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