From Flow Measurement
|Magnetic flowmeters (magmeters) are designed to measure the flow of electrically|
conductive liquids in a closed pipe. They are volumetric flow-measuring
devices and have been commercially available since the mid-1950s. Sizes range
from 1/25 inch to about 120 inches from most manufacturers. This covers a flow
range of about 0.003 gallon per minute to about 1,100,000 gallons per minute.
Early units were flanged devices that bolted to adjacent pipe flanges in much the
same way as an ordinary section of flanged pipe. They were large, heavy, and
expensive, but they offered several advantages over other flowmeters available at
With the obstructionless design, there are no moving parts to wear and no pressure
drop other than that offered by a section of pipe with equal length and inside
diameter. The only wetted parts are the electrodes and an insulating liner. These
can be selected for compatibility with the most corrosive of chemicals as well as
to meet sanitary requirements for food applications such as milk and other liquid
dairy products. The output signal is linear and directly proportional to the flow
velocity. Accuracy over a wide range (typically 30...
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Flowmeters that measure mass directly using the properties of mass, as opposed to those that measure volume or velocity, were developed and commercialized in the 1980s. Meters of this type have found...
Magnetic Flowmeters Magnetic flowmeters (magmeters) are designed to measure the flow of electrically conductive liquids in a close pipe. With the obstructionless design, there are no moving parts to...
Velocity Methods Magnetic Flowmeters Magnetic flowmeters depend on the principle that motion between a conductor (the flowing fluid) and a magnetic field develops a voltage in the conductor...
For many years differential pressure types of flowmeters have been the most widely applied flow rate measuring device for fluid flows in pipes that require accurate measurement at reasonable cost.
Faraday's law of induction states that a conductor moving through magnetic flux induces an electromotive force in the conductor. In layman's terms, a wire generates a voltage as it moves through a...