An electromagnetic flowmeter is an instrument commonly used to measure the flow of fluids, and its working principle is based on the phenomenon of electromagnetic induction.
Through the use of electromagnetic induction, electromagnetic flowmeters can measure the flow of conductive substances (such as water, solutions) in fluids, and are widely used in industrial production and municipal engineering.
1. Principle of electromagnetic inductionElectromagnetic flowmeters work based on Faraday's law and the principle of action of Lorentz force.
According to Faraday's law, a conductive body moving in a magnetic field creates an induced electromotive force, i.e., when a conductive liquid flows through a magnetic field, it creates an induced electromotive force on both sides of the fluid.
According to the mechanism of action of the Lorentz force, the induced electromotive force generated by the conductive liquid in the magnetic field will be affected by the Lorentz force, resulting in a deflection of the fluid perpendicular to the magnetic field and the direction of fluid motion.
Second, the working principle 1Magnetic field generated:
An electromagnetic flowmeter usually consists of two pairs of coils perpendicular to each other at 90 degrees.
One of these coils, called the excitation coil, generates a stable magnetic field by applying electricity;
The other pair of coils is called a detection coil and is used to detect electromotive force in a fluid.
2.Fluid ingress:
The fluid to be measured enters through the pipe of the electromagnetic flowmeter and is subjected to a magnetic field.
3.Induced EMF:
When a conductive substance in a fluid moves in a magnetic field, it generates an induced electromotive force.
Since the electromagnetic flowmeter's detection coil is located upstream and downstream of the fluid pipeline, it can detect this induced EMF.
4.Signal Output:
Due to the presence of induced electromotive force, a voltage signal is induced in the detection coil.
This signal is directly proportional to the fluid flow velocity.
By processing the voltage signal, the flow rate and magnitude of the fluid can be obtained.
3. Advantages and applications1No pressure loss:
The electromagnetic flowmeter has a non-intrusive design, and the fluid will not encounter any resistance when passing through the pipe, which will not affect the normal operation of the fluid.
2.High-precision measurement:
The electromagnetic flowmeter has high measurement accuracy, which can meet various flow rate ranges and accuracy requirements, and is widely used in industrial fields that need to accurately measure the flow rate.
3.Wide applicability:
The electromagnetic flowmeter can measure liquids with various conductive properties, such as water, solutions, etc., and is suitable for chemical industry, water treatment, petrochemical industry, food and beverage and other fields.
4.Good long-term stability:
Electromagnetic flowmeters use electronic components that have a long service life and can maintain measurement stability for a long time.
Electromagnetic flowmeters work by measuring the flow rate and flow rate in conductive liquids using the phenomenon of electromagnetic induction.
By generating a magnetic field and detecting the induced electromotive force in a conductive liquid, the flow rate and magnitude of the fluid can be obtained.
Electromagnetic flowmeters have the advantages of no pressure loss, high-precision measurement, wide applicability and good long-term stability, and are widely used in industrial production and municipal engineering.