explain how magnetic flowmeter works

Question Posted / guest

1 Answers
5495 Views
I also Faced
E-Mail Answers

explain how magnetic flowmeter works..

The third most common flowmeter behind differential pressure
and positive displacement flow meters, is the magnetic flow
meter, also technically an electromagnetic flow meter or
more commonly just called a mag meter. A magnetic field is
applied to the metering tube, which results in a potential
difference proportional to the flow velocity perpendicular
to the flux lines. The physical principle at work is
electromagnetic induction. The magnetic flow meter requires
a conducting fluid, for example, water that contains ions,
and an electrical insulating pipe surface, for example, a
rubber-lined steel tube.
Usually electrochemical and other effects at the electrodes
make the potential difference drift up and down, making it
hard to determine the fluid flow induced potential
difference. To mitigate this, the magnetic field is
constantly reversed, cancelling out the static potential
difference. This however impedes the use of permanent
magnets for magnetic flowmeters.

Is This Answer Correct ?

0 Yes

1 No

Post New Answer

More Instrumentation Interview Questions

Technician A says that a fuel tank sending unit will have a high resistance only when the tank is full. Technician B says that its resistance when the tank is full depends on whether the sending unit is designed for use with a bimetallic gauge or with a magnetic gauge. Who is correct?

3 Answers

what is linerity and non-linearity?

2 Answers

How to change dcs card in online. (Dsc is maxdna)

0 Answers

how to calculate control valve bonnet size?? or how to select its material?

0 Answers Jacobs,

What materials are used in thermo wells?

0 Answers

Pressure tx shows 1 mbar but we need 1000 mbar at this process condition .. how can we sort it out .

0 Answers

What are different type of instrument cable