Electromagnetic flowmeters By measuring the magnetic flux changes due to the velocity of the current fluid, they can measure the amount of flow with acceptable accuracy. In fact, by creating a magnetic flux in the fluid passing through the flowmeter and measuring it, an electromagnetic flowmeter can be achieved.
Building Magnetic flowmeter Electromagnetic Flow Measurement:
Electronic part or processor
of windings Field creation of
electrodes
Body of
flowmeter Electromagnetic flowmeters usually work at a maximum temperature of 80 ° and according to the light insideFlowmeter It is made in Teflon or Hard Rabro Literaz in various applications.
Electromagnetic Flowmeter According to Faraday’s law of induction If a conductor body moves within a magnetic field, a voltage is induced at both ends. This induction voltage will be proportional to the conductor velocity.
The application of this method is limited to conductive fluids.
In the last few decades, after the invention of technology Electromagnetic flowmeters, Other technologies such as ultrasonic flowmeters, turbine flow-meters and non-turbine flowmeters were invented.
But none of these technologies have ever been able to match the accuracy of the readings of electromagnetic flowmeters. It is clear that since the velocity is different in different parts of the pipe cross section (fluid profile), the actual velocity in each cross section is the average velocity of all its points. The reason for the high accuracy of magnetic meters is that the instantaneous flow is measured, the average instantaneous flow is millions of points inside the meter cylinder that are constantly being measured.
For example, in ultrasonic flowmeters with two sensors, the measured flow is always the average flow of different points on the signal path between the two sensors, not the points inside the total tube volume. (FS: Full Scale). While the accuracy of electromagnetic flowmeters is better than 0.5% to 0.2%.
Principles of measurement in electromagnetic flowmeters:
According to Faraday’s law. Normally, any conductor object that intersects a magnetic field, a voltage will be induced inside the object, which will be proportional to the magnitude of the magnetic field, the angle at which the conductor body collides with the magnetic field, and finally the velo city of that object through thecurrent field. The intensity of the field and the angle of impact in the action of the induced voltage inside the conductor will be proportional to the velocity of the fluid.
u = k * B * D * V
u: moving induced voltage
K: constant value of coefficient
B: magnetic field strength
V: moving velocity within the magnetic field
(V = u / (k * B * D
Therefore, due to the fact that the coefficients D, B, K are constant, the voltage obtained from the probes is measured at velocity V, which with the coefficient of this factor at the cross-sectional area of flowmeter S, the total volume of fluid passage Q is obtained instantaneously.
Q = V * S
Q: The amount of volume transferred
V: Speed
S: The cross section of the meter
assuming that the velocity is in m / s and the cross section is in m2. As a result, according to the above relation, m3 / s = m2 × m / s
, the transfer volume or flow rate (Q) will be in terms of m3 / s. Due to the application of different coefficients, different flow units such as lit / s, lit / min, m3 / h and توان can be received from the flowmeter. In some materials according to the weight and volume coefficients can be one Flowmeter Used as a measure of transient mass. The units used in this case are g / s, kg / s, kg / h, ton / h and..
To measure with this method, the electrical conductivity of the liquid must be more than 5 µs per centimeter. Explain that drinking water, once distilled, has a conductivity of more than 5 microsiemens per square centimeter.
Conductivity> 5 µs / cm
Applications of Electromagnetic flowmeters Flow Measurement:
Sewage facilities, dams, wells, pumping stations, urban and rural water supply lines, as well as measuring raw, drinking or treated water, wastewater, sewage and…
chemical industries, acids, caustic soda, lead,
food industry adhesive, Mineral water, milk, yogurt, buttermilk, molasses, beet juice
Pharmaceutical
industry Metal industry / Mineral
Paper industry / Paper pulp
Marine
industry Water pipe network / Meeting management
Agricultural irrigation
industry Measurement industry / Water sales
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