Bidirectional electromagnetic flowmeter

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1. Working principle of electromagnetic flowmeter

The working principle of electromagnetic flowmeter is based on Faradays law of electromagnetic induction, and its core is to calculate the flow rate by measuring the induced electromotive force generated by the movement of conductive fluid in a magnetic field. The following is the specific principle and characteristic analysis:

First, the core working principle is that when a conductive body flows through the measuring tube of an electromagnetic flowmeter at an average flow velocity v, a constant magnetic field (magnetic flux density B) perpendicular to the fluid direction is applied inside the measuring tube. According to Faradays law, positive and negative ions in a fluid undergo deflection under the action of Lorentz force, forming an induced electromotive force E between the electrodes on both sides of the measuring tube that is proportional to the fluid flow velocity. Its mathematical expression is: E=K × B × D × vE: Induced electromotive force (unit: Hertz volts, V) K: Instrument constant (related to structural parameters such as electrode shape and magnetic field distribution) B: Magnetic flux density (unit: Tesla, T) D: Inner diameter of the measuring tube (unit: meter, m) v: Average flow velocity of the fluid in the axial direction of the electrode section (unit: meter/second, m/s). By measuring the electromotive force E and combining known B, D, and K, the volumetric flow rate Q (Q) of the fluid can be calculated.=π D2v/4). Figure: Schematic diagram of the structure of an electromagnetic flowmeter (magnetic field direction perpendicular to the paper, fluid flows from left to right, electrodes are located on both sides of the measuring tube). Str

ong anti-interference ability, independent of fluid parameters: measurement results are not affected by fluid density, temperature, pressure, and viscosity. For example, instruments calibrated with water can be directly used to measure other conductive fluids without the need for recalibration. Conductivity requirement: Only the fluid conductivity needs to be ≥ 5 μ S/cm (the conductivity of ordinary tap water is about 300-800 μ S/cm), suitable for most water-based solutions and ionic liquids. Suitable for measuring solid-liquid two-phase flow in complex media: It can measure fluids containing suspended solid particles (such as mud, slurry), fibers (such as pulp), or high viscosity substances. The smooth design of the electrode surface can reduce particle adhesion. Corrosive medium: The inner lining of the measuring tube can be made of corrosion-resistant materials such as polytetrafluoroethylene (PTFE) and rubber, and the electrode can be made of Hastelloy alloy, titanium alloy, etc. It is suitable for highly corrosive liquids in industries such as chemical and pharmaceutical. The bidirectional measurement and wide range ratio of electromotive force direction are related to the fluid flow direction, and the flow direction can be determined through electrode signals to achieve bidirectional flow measurement. The range ratio can reach 1:100 or more, meeting the needs of different flow scenarios.

III. Typical Application Scenarios: Municipal and Environmental Protection, Sewage and Rainwater Discharge Monitoring, Water Reuse System, Flow Measurement, Industrial Process Control, Chemical Industry: Acid and Alkali Solution, Electrolyte Solution Transportation, Food Industry: Juice, Syrup, Alcohol Production Process Mon

1. Working principle of electromagnetic flowmeter

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