The electro-magnetic flow meter is based on the principle of Faraday’s law of Induction.
To simplify the explanation, if one induces a magnetic field for example across a pipe
and a conductor is moved at right angles through the field, then a voltage proportional to
the velocity of the conductor will be induced. There are many other factors involved in
this law, which I feel would only serve to confuse the reader.
Electro-magnetic flow meters have been in existence for many years and their evolution
has been moving fairly slowly until recently. Many companies manufacture these meters,
but few have been successful in developing a meter that is accurate within very tight
tolerances.
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