Measuring principle
An electrically conductive fluid flows inside an electrically insulated pipe through a magnetic 
field. This magnetic field is generated by a current, flowing through a pair of field coils.
Inside of the fluid, a voltage U is generated:
U = v * k * B * D
in which:
v = mean flow velocity
k = factor correcting for geometry
B = magnetic field strength
D = inner diameter of flowmeter
The signal voltage U is picked off by electrodes and is proportional to the mean flow velocity v 
and thus the flow rate Q. A signal converter is used to amplify the signal voltage, filter it and 
convert it into signals for totalizing, recording and output processing.
Figure 1-1: Measuring principle
1 Field coils
2 Magnetic field
3 Electrodes
4 Induced voltage (proportional to flow velocity