Introduction: This paper describes the working principle of electromagnetic flowmeter, electromagnetic flowmeter hear is not first think of the flow of it, and this "flow" nor "Traffic." Come and find out what this "flow" is~~~
1. The working principle of electromagnetic flowmeter - concept
Electromagnetic flowmeter--a meter that measures the volumetric flow rate of conductive liquids by using Faraday's law of electromagnetic induction. Electromagnetic flowmeter has many years of experience in the field of flow metering. Its design and quality control system ensure high precision and high reliability of the product, with fast response and elimination of output noise, and can be lined to make the electromagnetic flowmeter The application is more extensive.
2. The working principle of electromagnetic flowmeter--structure and function
The structure of the electromagnetic flowmeter is mainly composed of a magnetic circuit system, a measuring conduit, an electrode, a casing, a lining and a converter.
Magnetic circuit system - produces a uniform DC or AC magnetic field.
Measuring the catheter - let the conductive liquid being tested pass.
Electrode - an induced potential signal that is proportional to and measured.
The outer casing - made of ferromagnetic material, is the outer cover of the distribution system excitation coil and isolates the interference of the external magnetic field.
Lining - Increases the corrosion resistance of the measuring tube and prevents the induced potential from being shorted by the metal measuring tube wall.
Converter - Amplifies and converts the induced potential signal into a uniform standard signal and suppresses the dominant interfering signal.
3. The working principle of electromagnetic flowmeter
The basic principle of the electromagnetic flowmeter is Faraday's law of electromagnetic induction, that is, the conductive medium in the measuring tube is equivalent to the conductive metal rod in the Faraday test, and the two electromagnetic coils at the upper and lower ends generate a constant magnetic field. When a conductive medium flows, an induced electromotive force is generated. The direction of the electromotive force is in accordance with the "Fleming right-hand rule", and the magnitude of the induced potential is determined by the following formula:
Ex=BDv
Where Ex - induced potential, V;
B—magnetic induction, T
D—pipe inner diameter, m
V—the average flow rate of the liquid, m/s
The measuring tube is electromagnetically isolated from the fluid and the measuring electrode by a non-conductive inner liner (rubber, Teflon, etc.). An excitation coil is arranged above and below the measuring tube, and a magnetic field is passed through the measuring tube after the exciting current is applied, and a pair of electrodes are mounted on the inner wall of the measuring tube to contact the liquid, and the induced potential is extracted and sent to the converter.
Well, the working principle of electromagnetic flowmeter is introduced to this, pro, have you learned? Here are a few articles related to this, interested to pay attention to it~~~
1. Influencing factors and selection and installation of electromagnetic flowmeter
2. Talking about the use and measurement management of electromagnetic flowmeter
3. How to solve the problem that the electromagnetic flowmeter signal is too weak
Electromagnetic Flowmeter
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