Magnetic Flow Meters

What Are Magnetic Flow Meters?

Magnetic flow meters, also known as magmeters, are widely used in a variety of industrial field applications due to their reliable flow rate measurements and features such as low-pressure loss and maintenance-free operation.

Yokogawa’s ADMAG series magnetic flow meters are designed with dual-frequency excitation to achieve stable measurement, zero stability, and quick response times.

Learn more about how magnetic flow meters work and the technology behind Yokogawa's ADMAG flow meters.

Details

Magnetic Flow Meters Mag MeterADMAG Total Insight Electromagnetic Flow Meters

Total Insight is a Yokogawa concept for optimizing operations and reducing maintenance costs through every phase of the product lifecycle. The ADMAG TI magnetic flow measurement series consists of the ADMAG AXG and the ADMAG AXW electromagnetic flow meters. For industries such as pulp & paper and more, ADMAG TI series magnetic flow meters have digesters that are reinforced and protections to resist wear and deformation and extend service life, even under harsh high-pressure and high-temperature conditions. The ADMAG AXG is a complete redesign of the ADMAG AXF and will accommodate bore diameters from 2.5 mm up to 500 mm, while the revamped ADMAG AXW will accommodate bore diameters ranging from 25 mm to 1800 mm.

What Are the Benefits of Magnetic Flow Meters?

All Yokogawa magnetic flow meters are engineered with dual-frequency excitation, an innovative method that superimposes high frequencies on low frequencies, providing the best of AC and pulsed DC excitation. This technology ensures excellent flow noise immunity, fast response times, and excellent stability by utilizing the low-frequency spectrum while maintaining high accuracy and high zero stability.

How Does a Magnetic Flow Meter Work?

 

Magnetic Flow Meter Principle: Faraday's Law

Magnetic Flow Meters Mag Meter

Flow Measurement

Magnetic flow meters consist of a detector and a converter, with the principle of the detector adopting Faraday's electromagnetic induction law. Faraday's Law states that if conductive fluid flows in a magnetic field, an electromagnetic force is generated in proportion to the fluid's flow velocity. Generally, the inner walls of a detector's measurement tube (metal pipe made of SUS, etc.) are lined with a relatively thick insulating layer to prevent the shorting of the generated electromotive force. This insulating layer is referred to as "lining." There are many kinds of lining materials available that provide corrosion and abrasion resistance to the fluids being measured.

Resources

Overview:
  • To bring the customer a real-time monitoring and management capability, Yokogawa installed STARDOM (FCJ), flow meters, and transmitters at key points throughout the distribution network.
  • The STARDOM FCJ controllers achieved an accurate water loss management system while keeping the running costs to a minimum.
Overview:

Water Supply Treatment
FAST/TOOLS, STARDOM, Flowmeters, Liquid Analyzers

  • Bali's water treatment plant decided to employ the latest reliable control system in order to increase availability and quality of operation.
  • Centralized control system using FAST/TOOLS provides the sophisticated and flexible operation.
Application Note
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With the high temperatures, pressures, and levels of dissolved organics that are encountered, the ADMAG AXG flow meter design is ideal for use in all phases of the chemical recovery process.

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Boosting efficiency in Chlor-Alkali Plants with the ADMAG Magnetic Flowmeter provides accurate, stable flow measurement for Brine and Caustic in Chlor-Alkali electrolyzer cells, improving production efficiency and reducing energy consumption.

Application Note
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Challenge: The customer's existing measurement device was disturbed by vibration and could not be compensated or corrected by the product that was installed.

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Angel Yeast Co., Ltd. is a leading global player in the yeast and deep-processed products industry, with production bases in 13 cities worldwide. Their yeast series products account for over 17% of the global market, ranking second globally.
In their production process, additives like nitrogen, phosphorus, and potassium are crucial, requiring accurate measurement and stabilization to ensure the final product meets specifications. Yokogawa proposed the AXG electromagnetic flowmeter as a solution, providing dual-frequency excitation for both rapid response and reduced noise.

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Yokogawa’s latest generation of ADMAG AXG Series is the most suitable magnetic flowmeter with adhesion level diagnosis and dual-frequency excitation method provides stable flow measurement even under high flow noise in the severe applications like the flow of aluminum slurries.

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Questionable flow and conductivity measurements during CIP could raise questions about food quality and safety.

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Flow performance extends cell membrane life with accurate, reliable, and stable performance - saving millions of dollars in membrane repair costs, reducing instrument maintenance costs and production downtime, and production loss.

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The ADMAG AXR employs the patented “Dual Frequency Excitation Method.” This unique technology combines the best properties of low-frequency excitation to enable a stable measurement and high-frequency excitation to deliver excellent noise immunity. As a result, the AXR can suppress process-generated noise to secure zero stability without sacrificing fast response time. In addition, the AXR achieves the same level of noise immunity as a 4-wire circuit under varying fluid conditions and delivers the performance necessary to meet the requirements for control loop applications.

Overview:

The condiment facility staff had success with Yokogawa’s ADMAG TI AXG magnetic flowmeters in other applications. When they learned EtherNet/IP communication was now offered on the ADMAG TI - AXG, they chose to use the Yokogawa magmeter solution on the mustard grinding lines.

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Application Note
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Yokogawa's ceramic liner can offer the customer superior resistance to thermal shock and the failure that can occur due to liner cracking. This is due to Yokogawa's use of 99.9% pure Al2O3 for the liner.

Industries:
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Accurate and durable magnetic flow meters (magmeters) were difficult to maintain in the process as the corrosive and abrasive nature of the process degraded their operation. That led to leaks that not only reduced the flow but also contaminated the product and the magmeters. Since Sigura maintained strong vigilance, the company needed to replace some magmeters monthly...

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Application Note
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In order to reduce emissions of air pollutants such as sulfur oxides (SOx) and nitrogen oxides (NOx), power plants have installed flue gas desulfurization systems known as scrubbers.

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Yokogawa’s ADMAG TI - AXG magnetic flowmeter (magmeter) with EtherNet/IP is used to measure the water moving from the pump to the snow cannons. The accurate measurement allows the operator to monitor and control the water in the mixture to produce artificial snow with the perfect consistency.

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Using recycled oil as an energy source poses a challenge due to its inconsistent composition and potential impurities. Conventional flowmeter technologies are impractical in such cases. The CA Series, however, reliably and stably measures the flow of recycled oil mixed with water.

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Read this eBook to learn how to best leverage the latest measurement instrumentation to avoid incidents and improve productivity. You will also find valuable information about overcoming common CIP challenges and stories of success.

Industries:
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Smart devices, like Yokogawa’s line of Total Insight transmitters and flowmeters contribute to Digital Transformation during operations and throughout the lifecycle of the instrument.

Yokogawa Technical Report
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After having undergone several improvements, magnetic flow meters have become highly accurate and reliable and are widely used in the industrial instrument field today. Magnetic flow meters consist of a detector and a converter, with the principle of the detector adopting Faraday's electromagnetic induction law.

Overview:

Recent or pending air pollution legislation to reduce the amount of air pollutants is increasing worldwide. In the U.S., The Clean Air Act address numerous air quality problems. One of these problems is acid rain (much of which falls in Canada) caused by sulfur dioxide and nitrogen oxide emissions from fossil-fueled power plants and other industrial and transportation sources.

They help remove stray energy or noise as it builds up in the flow process by grounding it. They can even help protect the magmeter liner from damage in harsher processes.
Edition 1
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They help remove stray energy or noise as it builds up in the flow process by grounding it. They can even help protect the magmeter liner from damage in harsher processes.

Downloads

Videos

Overview:

This video explains how to open .eds files in Studio 5000. The Yokogawa Magnetic Flow Meter ADMAG TI - AXG with EtherNet/IP is used as an example.

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This video shows steps to bring the Studio 5000 Data Points into the FactoryTalk View Studio. The Yokogawa Magnetic Flow Meter ADMAG IT - AXG with EtherNet/IP is shown as an example.

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This video describes the process of connecting the Yokogawa Magnetic Flow Meter ADMAG TI - AXG with EtherNet/IP to a webserver

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In the digester process, high temperature and pressure, along with the slurry pulp, can cause extreme damage to traditional meters.

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Our experts review the theory behind flow measurement technologies. Discuss common flow application challenges and evaluate the different technologies when selecting a flow meter. They also give examples of best installation practices for successful measurements.

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What about other instrumentation pain-points in the blow tank, washing, or bleaching process?

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To effectively control and optimize industrial processes, trusting measurements from flowmeters is vital.

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