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Magnetic Flowmeter Technology

Even though there are plenty of kinds of magnetic flow meters available in the market today for gauging liquid flow rates, they all have the same function. And that is according to the radical principles of Faraday’s law, dictating the connection between a moving conductor and the electromotive force it makes within a magnetic field. 

However, in spite of their similarities and resemblance, some magnetic flow meters are, for the most part, best applied to particular tasks than others. Therefore, proper application and, most especially, flow meter selection are both crucial matters in a fluid measurement task.

Issues of ease of use, reliability, accuracy, and cost are some of the critical factors included in selecting a flow meter. For more information about magnetic flow meter technologies, read on!

Capacity and Size Factors

The substantial characteristics and features of a magnetic flow meter, specifically in size, influence its processing capabilities and how it can effectively manage the velocity range. Most magnetic flow meters have or possess a meter size of approximately 15 to 200 millimeters (0.6 to 7.9 inches) and a velocity range of roughly 0.3 to 10 meters per second (.98 and 32.feet per second).

The bigger the size of the flow meter and the higher its velocity capability, the greater the flow rate it can, for the most part, gauge. Some electromagnetic flow meters can, more often than not, dispense measurements of velocities below the normal range. However, the preciseness downgrades to some degree.

Similarly, having flow meters deal with velocities higher than 5 meters per second (16 feet per second) escalates the risk of pipe damage and deterioration. Electromagnetic flow meters can be, for the most part, very effective for applications including corrosive conditions and for gauging or calculating the flow rate of harmful materials, for example, slurries or abrasives. 

Moreover, magnetic flow meters, such as Smart Measurement Magnetic Flow Meters, are generally used in gauging pulp or paper stock, and the pipe networks and low flow rates with somewhat short inside diameters. A lot of electromagnetic flow meters boost their performance by swapping between two different range capabilities, enabling them to reset their features according to the adjustments in the operating conditions. 

Piping System Design

Circular designs are, for the most part, common in most piping systems as they provide a relatively simple and straightforward construction configuration. Electromagnetic flow meters are, believe it or not, more applied easily to a circular pipe network compared to a rectangular pipe network, and typically offer more productive measurements.

Although fluid velocity is normally unaffected or shows no effects and changes by the pipe conformity in this kind of network, the circular configuration can, more often than not, pull or twist the magnetic field out of shape, calling a need for recalibration.

Furthermore, in straight piping configurations, the downstream and upstream requirements are, for the most part, different for each kind of flow meter. In many instances, the straight design of a pipe needs to have a particular distance from the flow meter face and the electrodes in both downstream and upstream flow. Also, the electromagnetic coils can be arranged in a flow meter to lessen piping effects throughout the magnetic field distribution. 

Dangerous Environments

Electromagnetic flow meters can be utilized to gauge or calculate flow rates for explosive or combustible liquids, usually under peril conditions and environments. Such environments require explosion-resistant flow meter as the safety parameters, and design specification is regulated or managed by presiding authorities.

Remote controls might be, more often than not, utilized to boost flow meter reliability in peril conditions, and important controls are available as well. Some electromagnetic flow meters are furnished with a dividing housing that splits field wiring away from electronic circuitry. 

Pros and Cons

There are plenty of benefits to using magnetic flow meters to carry out fluid flow measurements. They commonly have no moving components and non-invasive, minimizing the frequency of repairs and risk of breakdowns. Here are some of the advantages provided by electromagnetic flow meters:

  • Magnetic flow meters can calculate multidirectional flow.
  • Magnetic flow meters can calculate both very high and very low volume flow rates, with a maximum volume of at least 10 cubic feet and a minimum diameter of approximately 0.125 inches.
  • Small quantities of electrode metals are required.
  • Magnetic flow meters are able to deal with various kinds of bases and acids, as well as water-based solutions.
  • Magnetic flows are mechanically obstruction-less.
  • Magnetic flows use low electrical power. 

In spite of these advantages, electromagnetic flow meters also showcase certain disadvantages in terms of flow rate measurement. Magnetic flow meters are only, like it or not, effective and productive on conductive fluids, and gases and unmixed hydrocarbons can’t be calculated. Also, hydrodynamic effects can change the flow pattern and distort the velocity rate that can impede with the operations. 


Magnetic flow meters can be, for the most part, heavy, depending on their capacity and size. Also, those with higher abrasion and corrosion resistance can be, believe it or not, expensive. Keep in mind, to ensure well-grounded performance, consider velocity and size limits.

Author’s bio: Sylvia Hopkins is a writer and a blogger who specializes in email marketing campaigns and ghost blogging. She writes about flow measurement instrumentation, flow measurement application, and technology. When not working, Sylvia spends some quality time with her family and friends.