Explain the electro-magnetic flow meter with neat sketch and write it’s application.

Explain the electro-magnetic flow meter with neat sketch and write it’s application. 
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1 Answer

Answer :

Electromagnetic flow meter:

Principle of Operation:

1. The operation of an Electro-magnetic flow meter is based upon Faraday's Law, which states that the voltage induced across any conductor as it moves at right angles through a  magnetic field is proportional to the velocity of that conductor.

2. E is proportional to B x L x V where: E = B x L x V E = The voltage generated in a conductor B = The magnetic field strength L = The length of the conductor V = The velocity of the conductor.

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Construction & Working:

1. It consists of a pair of Electrodes mounted in opposite direction of a non-conducting, nonmagnetic pipe carrying liquid whose flow is to be measured.

2. It is surrounded by an electromagnet which produces a magnetic field.

3. The conductive fluid is passed through the pipe.

4. As the fluid passes, its motion relative to field produces an e.m.f. proportional to velocity according to Faradays law. 

5. This output e.m.f. is collected by the electrodes and is given to external circuit.

6. The e.m.f. or voltages produced are small especially at low flow rates.

7. The pipe must be non-conductive, non-magnetic.

Application:-

They can usually measure multidirectional flow, either upstream or downstream.

It used for measurement extremely low flow rates.

It can be also used for measurement of flow rate of slurries, greasy materials.

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