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September 22, 2022 Flow Meters GPImeters

A magnetic flow meter, also known as a mag meter or electromagnetic meter, is an excellent device for measuring the velocity of fluids in a pipe or tube. Besides their innate durability, magnetic meters offer a wide range of advantages.

This article will review everything you need to know about a magnetic flow meter and the reasons you should use one.

What Are Mag Meters?

Mag meters are volumetric flow meters that measure the velocity of a fluid in pipes or tubes without moving parts. They take measurements using electrodes connected to the flow of the liquid. The lack of moving parts is an essential characteristic of electromagnetic flow meters.

A mag flow meter is consistent and accurate regardless of pressure, temperature, or the liquid's viscosity or density. Our meters with LCD display and pulse out, and our meters with pulse out only can handle up to 20% solids and pressures up to 150 PSI @ 70°F.

magnetic flow meter

How Magnetic Meters Work

Magnetic meters operate based on Faraday's law of electromagnetic induction, which states that when a conductor moves through a magnetic field, it will induce a voltage proportional to the fluid's velocity.

Mag meters measure the speed of the liquid in the tube using the voltage, the distance between the electrodes, and the strength of the emitted magnetic field. Flow measurement with an electromagnetic flow meter is consistent and reliable.

The Components of a Magnetic Flow Meter

A magnetic flow meter has two components:

  • A sensor, which contains the electrodes and is connected to the pipe
  • A transmitter, which sits on top of the sensor and collects the data

Mag meters from GPImeters can be installed vertically or horizontally.

Mag Flow Meter Applications

A mag flow meter is suitable for any application that uses conductive liquids, even those with very low conductivity. Examples include:

  • Wastewater
  • Irrigation systems
  • HVAC
  • Energy management systems
  • Building automation systems
  • Process industries
  • Chilled water
  • Heating/cooling loops
  • Residential/tenant water usage

Magnetic Flow Meter Benefits

The simple construction of a magnetic flow meter makes it durable and reliable. But the advantages of mag meters don't end there. Magnetic meters are also prized for their:


Mag meters are considered the most precise of all volumetric flow meters.

Real-Time Readings

Magnetic meters provide instant readings with no time lag.

Low Maintenance Requirements

The lack of moving parts means very little to maintain on an electromagnetic meter.


With no moving parts, a mag flow meter experiences little wear and tear, contributing to a longer work span.

Cost Savings

Low maintenance requirements, combined with a longer work span and the lack of parts to replace, provide significant cost savings in operating a magnetic flow meter.

Lower Power Usage

Mag meters use little power, further contributing to their cost effectiveness.


An electromagnetic meter can handle many liquids, including those that are dirty, thick, corrosive, or acidic. Mag meters also need no calibration for compatible electrically conductive fluids.

magnetic flow meter

Purchase Magnetic Flow Meters From GPImeters Today

GPImeters is the source for magnetic flow meters you can depend on. Our magnetic meters offer high accuracy with quick response times and can tolerate high flows without damage. Order your mag meter now.

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