The Electromagnetic Flow Measuring Principle
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- Опубликовано: 13 июл 2009
- eh.digital/2RiJxpJ - Illustration of the electromagnetic flow measuring principle.
Faraday’s law of induction states that a metal rod moving in a magnetic field induces electrical voltage. This dynamo principle also governs the way electromagnetic flowmeters work. Endress+Hauer's electromagnetic flowmeters are suited to measure all electrically conductive liquids in every industry. 
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Thanks to all these companies trying to explain how their products work. It helps me with finishing the engineering studies
This is great! I love how you guys made the 3D model to show how it works, it makes it so much easier to understand. Thank you so much for making this!
0 ooo 09n9bb9ppp
A very nice and crisp video with good visuals.
To the point. Fit to purpose.
10/10
Amazing description through great animation!
You are extraordinary!!!! I am very very grateful!! Thank you, Sir! Thank you!
Great contribution by EndressHauserAG. I am impressed. Please continue your contributions to the society!
excellent explanations, I like, perfect illustration for clients. Thanks from Kyrgyzstan
A best animation And Instrument video...thanks, to share this Info on Electromagnetic Flow meter.✌️
Such a wonderful animation :)
Thanks EH 🤝
your video make me Understand about electromagnetic flow meter. thanks
Incredible with very good visuals.
Great animation! Should work as the leading example for educational videos!
this is so beautiful, thanks a lot
Thank you so much! Just reading the explanation through words and documents confused me so your RUclips video really helped!
Awesome animation, thanks!
Transcript of the video:
Basic physics of this principle can be traced back to the English physicist Michael Faraday. Two field coil is located in each electro magnetic flow meter. These coils generate a constant magnetic field over the entire cross section of the measuring tube. Two electrode which can pick up electrical voltages are installed at a right angle in the wall of the tube. If there is no gas/liquid flow, no induce electrical voltages measured at first between the two electrodes. The electrically charged particles of the conductive liquids/gas are evenly distributed. Shown here in red and blue particles. However, as soon as the liquid starts to flow in the measuring tube magnetic field applied a force to the charged particles as a results the positively and negatively charged particles in the liquid are separated and collect on the opposite side of the tube wall. Now an electrical voltage forms which is detected and measured by the two electrodes. This voltage is directly proportional to the flow velocity on the pipe line together with the known tube cross section the flow volume can then be calculated. The greater the flow velocity, thus the separations of the charge particles greater the electrical voltage between the electrodes. The electrodes also detects what is called interference voltage. Which has to be separated from the actual measuring signal. One method that has been successfully used for this purposes to create the magnetic field with a pulse direct current, to do so the polarity of the magnetic field is alternately reversed, illustrated here in slow motion. Voltage pick up on the measuring electrode now constantly changes in polarity. As a result all constant interference voltages can be eliminated. For example: electrochemical effect on the liquid or external electromagnetic field. Thus, the size of such interference has no impact whatsoever on the actual measuring signals. The advantages of this are a stable measurements and a stable system zero point.
Thank you for your comment. To see the complete transcript, please enable the subtitles/closed captions function of this video or open the transcript pane by clicking on the three dots and “show transcript”.
thanks from egypt , wonderful explanation
perfeito, excelente explicação. Obrigada pelas informações. sz
Thank you sooo much sir for this extra ordinary effort
Very nice explanation with good animation.
Thank you. Very informative.
Excelente información!
Great explanation!
Awesome presentation
Now i get a concept how flow meter works
Nice Explanation and Nice Animations!
Great effort and explination!
wonderful illustration
this video very nice explanation and good animation and very help full
Great explanation.
very nice explanation with good animation...👍
Amazing explanation
Awesome explaination thank you
very nice explanation with good animation
Thank you additional knowledge
For sure a great effort.
yo youre just straight up awesome
understanding increased by this video.
Thank you Sir for the video. The animation is very good
Amazing!
very informative, nice animation
wonderful animation
Well explained... Thanks
Very good explanation :) I didn't understand though what charged particles would be in water; I'm assuming hydronium and hydroxide ions and we assume they are randomly evenly distributed in the water?
Excellent explanation...
CLEAR VIDEO..THANKS
nice and so informative video
@Jeston: Electromagnetic Flowmeters are absolutely suitable for milk (conductivity of milk 4 to 6 mS/cm). A hygienic version is often required (EHEDG/3A)
excellent video
thanks
Great !
nice explanation..........
great animation ....concept clear in just 4 min..great
Kunjal Brahmbhatt barobar
Instant subscribed
💖 This is an inspiration for ME !! Even I make "INSTRUMENTATION VIDEOS".
I hope I can emulate your presentation skills.
All the best for your future videos ☺
i have experience working with E&H flowmeter.. Great products!!
Could explain me in detail all the process plzz
How we can isolate the electromagnetic Flow Meter ??
I want to stop the count process
Sir can you please tell me from where I can learn animation making just like you did here ??
I am looking for a flow meter in a vacuum sewage system, Since there is Sewage slurry, the conveying air in the pipe i want to determine if there is only air in the system, creating an alarm for a vacuum leak.
Very help full for me
does this work for laminar and turbulent flows?
great!
its good please also make video on electrical instrument please please sir
Good video
thanls for making my life easier
thank u
Thank you sir
fabulous
Nice video
Very good
@David: Faraday’s law of electromagnetic induction is the basic principle of any EMF. A voltage is induced if an electric conductor is moved through a magnetic field.
Instead of a wire moved within a magnetic field formed by a permanent magnet, a conductive liquid passes through an alternating magnetic field generated by coils. If there is no movement, no voltage is induced (this are not particles, this is the induced voltage). The EMF’s is capable to measure the flowrate in both directions. Based on the polarity of the induced voltage one can detect the flow direction.
No, the principle at work here is the Hall effect, not the Faraday effect. There is no electromagnetic induction since the fields are static (except for the reversals).
So the flow rate depends on what substance (liquid) is flowing through the pipe right?
As long as the medium (liquid) is above a minimum conductivity level, the flow rate measured is directly proportional to the velocity of the medium flowing through the meter. There are of course some aspects to be considered when selecting and sizing an electromagnetic flowmeter for a specific measuring purpose including the properties of the medium.
Would you say that the hall effect principle is applied here since a magnetic field is placed perpendicular to flow and charges are displaced sideways
The hall effect is created though a permanent magnet where the measured voltage is proportional to the field strength.
With the magnetic-inductive measurement principle, a constant field strength is created and through the flow velocity (of an conductive liquid) a voltage is induced.
The voltage induced is proportional to the flow velocity and is supplied to the amplifier by means of two measuring electrodes.
Difference is therefore that the inductive measurement principle needs moving charge carriers in the magnetic field.
@@endresshauser thanks for the reply.Much appreciated
Is it safe and reliable install an electromagnetic flow meter,next to one water pump?
Thank you
@Rui Ilhavo - To keep the instrument performance and reliability is recommended to install the flowmeter >5DN inlet and >2DN outlet runs. There is one option for Promag 400 that it's possible to have 0 inlet and outlet runs but only for 90ºangle turns, nevertheless, with this option you have to consider pressure lost in the meter.
Regarding safety depends how you support the instrument mechanically, please be aware of vibrations on the pipe.
The flow meter is mounted 5 pipe diameter from the pump or any bends, 10 pipe diameters downstream of pipe should not have any bends. This to avoid turbulance in the flowing fluid.
This technology is used for all types of water such as fresh, effluent, and (seawater) cooling. But its not suitable for measuring non conductive fluids such as hydrocarbons.
What is used to distribute the magnetic field vertical?? 1:34
The orientation of the magnetic field is defined by the placement of the coils and the electrodes. Normally the electrodes are positioned at a 90° angle to the coils (ringcore coils).
will the electrodes detect induced voltage if they're outside the pipe?
Its depending on the measuring principle. In case of the mentioned System in the movie, electrodes need to be connected with the medium.
thank u....
❤
Study , thanks
can i use this to get measurement from partially filled (pressurized air and liquid) pipe?
@eren ay: as shown on the video, the flowmeter measures the voltage on the electrodes which is linear to the flow velocity. So by knowing the flow velocity and the cross section of the flowmeter, the electronics calculates the flow rate. This measurement is correct as long as the pipe is full. The moment the pipe is not full, the flow rate cannot be calculated accurately anymore, as the meter does not know how much liquid and how much air is in the pipe. As long as the measuring electrodes are in contact with the liquid, the meter will measure the velocity and calculate the volume on full pipe conditions. For this reason, we have implemented in the unit a non-full-pipe detection, i.e. the moment there is air on top of the meter and the so called EPD electrode is no longer in touch with the fluid, the meter will display an alarm so that the user is aware that his measurement will not be correct anymore. The moment the fluid is below the electrodes, there will be no measurement at all anymore.
First of all, thank you for your reply. So, do you have any product to measure partially filled pipe? I saw some ultrasound tech. but they are running at normal pressure such as sanitary systems.
None of the classical flowmeters can be used for partially filled pipes unless they're designed for this typical application and described accordingly. Usually it makes more sense to find a solution in installation to keep the pipe always full rather than to use a flow meter for partially filled pipes. The reason is with the measuring uncertainty. A flow meter for partially filled pipes does always offer an increased uncertainty compared to flow meters for full pipes. That's why only few flow meters for partially filled pipes can be found. Suggestions for modifying installation in order to keep the pipe full can be given if you contact our office/representative in your country.
Again thank you for your kind replies and suggestions.
In case of more bubbles in liquid, Will this flowmeter work correctly?
+Kháng Trương That's why it's installed vertical
Hello, i want ask how is measured the voltage? I particularly understand that positive particles are sent to one electrode and negative particles are sent do another electrode, so electrons are sent to one conductor and to the another conductor is sent what? I don't understand what determines that one electrode is anode and another electrode is cathode. Is there any diode behind the electrode?
Thank you for your question. Generally, the potential difference between the measuring electrodes is evaluated by state of the art electronics and filters in the sensor and transmitter of electromagnetic flowmeters. For further technical details please visit our website: eh.digital/proline-promag.
@@endresshauser thank you for information
thanks for helping me with revision for my exam
SO the electrodes are instales inside?
Yes, you can google.
cable from electrodes mounted inside are taken to the meter box located at certain distance. In side the meter box electronic ciruit takes care of amplification of low level signal and signal conditioning will be done. Later to dispay unit. It can be inside the meter box or a DCS system.
What, if the there is no flow but conductive fluid is still filled in it, will it show the output? if not why?
If the pipe is full with liquid but no flow, the output will show value zero.
Magnetic force is applied to particles to a single electrode, how are the oppositely charged ions goes to opposite side electrode as blue and red opposite charged ions separated ?
A conductive liquid contains positive and negative ions. As soon as the liquid starts to flow, the movement of the ions through the magnetic field results in a force on the ions, this is Faraday's law of induction. The force is proportional to the charge and causes the positive and negative ions to separate, depending on their charge. For illustration purposes, this process is shown strongly exaggerated in the animation.
Como se llama el inventor Suizo? No logro entender bien su nombre, Gracias
Father Bonaventura Thurlemann
Wickid! Almost a kinda Hall sensor
interesting electro flowmeter
We can provide you more regarding electromagnetic flow meter, contact me via tonybae@163.com
please explain why there is no voltage induce if there is no flow?
Thanks
Thank you for your question. An electromagnetic flowmeter operates based on Faraday's law of electromagnetic induction. According to this law, a voltage is induced in a conductor moving through a magnetic field. In the case of an electromagnetic flowmeter, the conductor is the conductive fluid flowing through the pipe, and the magnetic field is generated by coils surrounding the pipe.
When there is no flow, there is no movement of the conductive fluid through the magnetic field. As a result, no voltage is induced in the fluid. In other words, the absence of flow means there is no change in magnetic flux, which is essential for inducing a voltage.
But in this case voltage is also proportional to fluid ph??
There is no reference pH liquid to compare with. So, no.
كنير عم يجنن شرحلك كتير عم احب اشكرك بليز تقبل الشكر بليز فكككك يووووووور قراند فاذر اششششش شارب
What is the out put of flow meter mA/v
Our electromagnetic flowmeters offer a wide selection of output possibilities covering analogue to digital as well as multiple and configurable outputs including 4 to 20mA. Find out more about our flowmeters and their respective outputs here eh.digital/3OnblHA
This is same function as QUADRUPOLE in mass spectrometry
How to troubleshoot if have no reading?
You may contact your local technical support or download manuals on www.endress.com
I always think the measurement will depend on the conductivity of the fluid. cleary not.
Why the particles aren't affected by the magnetic field when there's no flow?
No flow, so where is the particles.
god bless u
por Dios muy buen video pero pongalo en español
Does it also measure air flow ?
Dear Hardik Patel, electromagnetic flowmeters measure conductive fluids. For air flow measurement, feel free to have a look at thermal, vortex, Coriolis or ultrasonic measurement devices.
@@endresshauser Thanks for your suggestion
@@endresshauser in our plant, coriolis flow meter is connected in palm oil and syrup line, so it's not showing accurate results, air flow in before fluids flow due to empty line. And also show reading without fluids flow.
Does it good choice to use electromagnetic flow meter.?
@@hardikpatel8149 for a particular application we'd kindly ask you to contact your local Endress+Hauser support. There you'll find best assistance for the tailored solution. The contact details can be found here: www.endress.com/en/contact
Fabio timbo matando noix
Wondering how many EE/PE engineering students landed here while studying for end sem GTU exams...
I'm studying Instrumentation & Control Engineering and I love these videos! They're so much easier to comprehend compared to the annoying teachers who go on and on ad nauseam without really simplifying the information.