When a process deals with higher-viscosity or high-particulate fluids, such as cement, wastewater or slurries, magnetic flow meters are highly suited to the task because of the absence of internal parts that would otherwise disrupt the flow. This design results in small pressure drops.
Magnetic flowmeters register flow velocity with the aid of coils around either a non-magnetic pipeline or a pipe made of conductive material, such as stainless steel, with an interior lining. Voltage passed through the coils creates a magnetic field inside the pipe. The flow of conductive liquid inside goes through the field at right angles. Electrodes read the voltage level generated at the field, which is proportional to the velocity of the fluid. A typical milliamp DC range of 4 to 20, amplified by a converter or transmitter, corresponds to the flow rate.
Rosemount Magnetic Flow Meter Calibration
Since the minimum fluid conductivity must typically be between 1 to 5 microsiemens/cm, a magnetic flow meter doesn’t register most petroleum products or gasses. Magnetic flow meters often accommodate turndown ratios of 100:1 and 1/8″ to 96″ pipe sizes, yielding accuracy between ± 0.2% and ± 2%. They also require a straight run of approximately 5 diameters upstream and 3 downstream.
The Rosemount Magnetic Flow Meter features a built-in diagnostic to verify whether the meter is correctly calibrated, bypassing the need to shut down the process or remove the meter for a checkup.
An Experienced Control Instrumentation Supply Company
Contact an experienced control system supplier for rosemount magnetic flow meter, pressure and temperature monitors, pressure transmitters, panel meters or any other control instrument.
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