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Electromagnetic Flow Meter

Objectives

  • Recognize the electromagnetic (mag) flow meter
  • Explain the function of the mag flow meter

What's a Flow Meter?

A flow meter is used to measure flow rate through a fixed area, like a pipe.

This measurement is usually expressed in terms of volume/time for a volumetric flow rate measurement (such as gpm, or m3/minute).

Types of Flow Meters

Industrial settings have a wide range of fluids with very different properties.

There are several different methods available to measure the flow rate of these fluids.

For example, some flow meters are:

  • Mechanical (a physical component is moved by the flow)
  • Pressure-based (uses principles to infer flow rate from pressure differential)
  • Electromagnetic (a magnetic field is used to determine flow rate)

The properties of the fluid, along with environmental conditions will determine which flow meter is the best choice to measure a given fluid’s flow rate.

Electromagnetic Flow Meters (AKA Mag Flow Meters)

Electromagnetic flow meters have a couple of advantages over mechanical and pressure-based flow meters.

  • They don't restrict flow in any way.
  • They can measure dirty fluid containing large particles or thick slurry-type fluids.

But...

The fluid must be conductive!

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Atmospheric Pressure
Low Pressure
Medium Pressure
High Pressure
Ground/Common
Lowest Voltage
Medium Voltage
Highest Voltage
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