ROSEMOUNT (1995) Magnetic Flowmeter Fundamentals
ROSEMOUNT (1995) Magnetic Flowmeter Fundamentals

The magnetic flowmeter is one of the most flexible
and universally applicable flow measurement
systems available. It provides completely
obstructionless flow metering, is nearly insensitive
to fluid properties, and is capable of measuring the
harshest corrosive fluids. It installs like a
conventional segment of process piping and has a
pressure drop similar to an equivalent length of
pipe. Magnetic flowmeters are ideally suited for
measuring harsh chemicals, slurries, fluids with
solids in suspension, and other extremely difficultto-
measure fluids. Their operating principles provide
flow measurement with a signal that is inherently
linear to the average volumetric flow rate—
regardless of fluid temperature, pressure, density,
viscosity, or direction. The only limitation is that the
fluid must be electrically conductive and nonmagnetic.
While magnetic flowmeters may be technically
feasible for most fluids and offer many advantages,
they are not necessarily the most cost-effective. For
many clean, non-corrosive fluids other means of flow
metering may be just as suitable at lower cost.
Magnetic flowmeter accuracy, for example, may not
outweigh the advantage of a simpler device with
tolerable accuracy. Where no other measurement
device will work, or will not work reliably with the
necessary accuracy, the magnetic flowmeter is an
obvious choice. Ideal fluid candidates generally fall
into the categories of corrosive, viscous, or dirty
fluids—particularly slurries. Magnetic flowmeters
are widely used in the water and waste, pulp and
paper, mining, chemical, and food industries.

ROSEMOUNT (1995) Magnetic Flowmeter Fundamentals

ROSEMOUNT (1995) Magnetic Flowmeter Fundamentals
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