Proper grounding of the flowtube is very important for magnetic flowmeters. The motional EMF
generated by most liquid flowstreams is very weak (1 millivolt or less!), and therefore may be easily
overshadowed by noise voltage present as a result of stray electric currents in the piping and/or liquid.
To combat this problem, magnetic flowmeters are usually equipped with grounding conductors placed
to shunt (bypass) stray electric currents around the flowtube so the only voltage intercepted by the
electrodes will be the motional EMF produced by liquid flow, and not voltage drops created by stray
currents through the resistance of the liquid. The following photograph shows a Rosemount model
8700 magnetic flowtube, with two braided-wire grounding straps clearly visible