Draw the sketch of electromagnetic flow meter and explain it. State advantages, disadvantages and applications of it.

Draw the sketch of electromagnetic flow meter and explain it. State advantages, disadvantages and applications of it.
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1 Answer

Answer :

Diagram: 

image

Explanation:

Electromagnetic flow meters works based on Faraday's Law of Electromagnetic Induction. According to this principle, when a conductive medium passes through a magnetic field B, a voltage E is generated which is proportional to the velocity v of the medium, the density of the magnetic field and the length of the conductor.

In an Electromagnetic flow meter, a current is applied to wire coils mounted within or outside the meter body to generate a magnetic field.

The liquid flowing through the pipe acts as the conductor and this induces a voltage which is proportional to the average flow velocity.

This voltage is detected by sensing electrodes mounted in the Electromagnetic flow meter body and sent to a transmitter which calculates the volumetric flow rate based on the pipe dimensions.

The induced voltage E=B L V

Where B=flux density wb/m2

L=length of Conductor i.e diameter of pipe in meter

v= velocity of Conductor i.e flow m/sec


Advantages: 

It has ability to measure reverse flow.

No additional pressure drops.

No obstruction is created to flow.

It is mainly suitable for hydraulic solid transport.

It is unaffected by changes in temperature, density, viscosity, concentration and electrical conductivity.


Disadvantages: 

It is not suitable for low velocity.

It is more expensive.

It is suitable for fluids having conductivity greater than 20 micro ohm/cm.

Gas inclusion cause errors.


Application: 

It is used for measurement of flow of portable water, raw water, chilled water.

Used for flow measurement of Corrosive liquids, slurries and pastes.

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