Chemical Feed

Download (2.8 MB)


This paper introduces the ADMAG AXR 2-wire magnetic flomwmeter solution for chemical feed application.

Expected benefits

  • Cost reduction of supporting infrastructure by US$1,000 to $2,000 per unit.
  • Lifetime energy savings.
  • 4-wire comparable stable and accurate process control to maximize the productivity.


  • The chemical feed application is one of the common application in various industry, and the accurate and stable flow measurement is the key to optimize the process control, and the performance of plant operation.
  • When the conductivity of the chemicals and main process is different, the injection brings sudden conductivity change and a non-uniform distribution of conductivity in the process.
  • The measurement stability under the fluid condition change is very important factor to be applied in the control loop, and traditionally, 4-wire magnetic flow meter is applied for the flow measurement of control loop.


Yokogawa's improved solution:

  • Newly released 2-wire ADMAG AXR series delivers dual benefits, 4-wire comparable excellent performance and cost reduction of 2-wire system in various applications.

1. Best-in-class performance.

The ADMAG AXR is the world's first 2-wire magnetic flow meter which employs the unique "Dual Frequency Excitation Method*1), "achieving 0.5% of rate of best-in-class accuracy and excellent stability for process measurement. In addition, the newly developed AXR key technologies*2)," achieves the same level of noise immunity as 4-wire type under the fluid condition change and delivers enough performance to meet the requirement to apply in the control loop.

*1) Dual Frequency Method

The dual frequency method successfully combines the best properties of low frequency excitation enabling the stability in measurement, and high frequency excitation delivering excellent noise immunity. As a result, AXR can suppress process- generated noise securing zero stability without sacrificing fast response time.

*2) AXR Key Technologies

AXR Key Technologies(1) Super-high density coil
Yokogawa has developed a perfectly aligned "super high density" coil winding technique to maximize the S/N ratio. This new technology increased the number of coil turns by 1.5 times compared to 4-wire magemeters, and successfully increase the signal portion of S/N ratio.

(2) Mirror finished lining
Rough lining surface is likely to generate turbulent flow near electrodes, which results in larger flow noise. AXR employs a mirror finished lining to ensure a smooth surface. It minimizes flow noise by reducing the flow turbulence.

Evaluation test (Internal Test):

Salt Injection TestApplication: Salt injection
Normal flow velocity: 2 m/s
Damping: 5 sec.
Test Model: AXR080G

The salt injection test was conducted to simulate a chemical feed application. AXR is installed serially with AXF 4 wire-type, and the concentrated salt water was injected in tap water 6 times. Salt injection will bring a sudden conductivity change and a non-uniform distribution of conductivity in the process. The ADMAG dual frequency excitation method filtered out the noise spike generated by the salt injection. As proven in the results of the conductivity and salt injection tests, AXR premium performance has extended the application range of 2-wire mags. AXR can be used in process control loops in the chemical industry.

2. Cost Reduction & ECO Friendly

4-wire (AXF) 2-wire (AXR) 
4-wire (AXF) 2-wire (AXR)

The ADMAG AXR 2-wire magnetic flow meter can be installed in the 2-wire system without any AC power source, thus drastically reducing the initial instrumentation cost, and power consumption. The power consumption of 2-wire type is only 1-4% of that of 4-wire type, and contributes to the operation cost reduction. In addition, over 96% reduced power consumption contribute to the life time energy saving and reduce the carbon foot print.

Estimated cost reduction:
Initial Cost compared to 4-wire (cable length 100m)

Cable: $2 -$3/m
Conduit pipe: $5 -10/m (including construction cost)
Power supply unit: $300

US $1000 - $2000 /unit cost saving

CO2 reduction:
46kg CO2 excretion can be reduced to 1.2kg /year


  • Chemical

    Chemical plants rely on continuous and batch production processes, each posing different requirements for a control system. A continuous process calls for a robust and stable control system that will not fail and cause the shutdown of a production line, whereas the emphasis with a batch process is on having a control system that allows great flexibility in making adjustments to formulas, procedures, and the like. Both kinds of systems need to be managed in available quality history of product, and to be able to execute non-routine operations. With its extensive product portfolio, experienced systems engineers, and global sales and service network, Yokogawa has a solution for every plant process.

    See More
  • Specialty & Fine Chemical

    Yokogawa has long served customers in the specialty and fine chemicals market. With a market leading batch solution that offers the best in class reliability and flexibility as well as industry experts who understand the complex requirements in designing a batch solution, you can be assured that in your partnership with Yokogawa you will have a system that will enable you to produce products that meet your customers’ needs in the future while maintaining safety and regulatory compliance.

    See More
  • Wastewater Treatment

    Wastewater treatment plants involve many pieces of equipment such as motors, pumps and blowers, which makes it important to reduce their electricity consumption and save running costs. Yokogawa provides optimum control solutions with digital technologies to improve energy efficiency.


    See More
  • Water & Wastewater

    Water resources are finite, and therefore contributing to a sustainable water cycle is one of the Sustainable Development Goals (SDGs). Yokogawa has been providing advanced digital control solutions for the stable supply of clean and safe water, wastewater treatment for protecting the water environment, water loss management and optimization of plant operation for reducing CO2 emissions and running costs. With our leading-edge technologies, dependable products and extensive expertise and experience of diverse water projects around the world, we work with you to provide sustainable water solutions that boost your business and add value throughout the plant lifecycle.

    Yokogawa supports a wide range of water control applications in both the municipal and industrial water markets.



    See More
  • Water Treatment

    Yokogawa provides optimum solutions to improve the reliable operation of water treatment plants. These solutions include sophisticated technologies, unsurpassed product quality, and extensive application know-how throughout the lifecycle.

    See More

Related Products & Solutions


    The ADMAG AXR is the world's first two-wire magnetic flow meter which employs the fluid noise free "Dual Frequency Excitation Method," achieving excellent stability for instrumentation.

    See More
  • Magnetic Flowmeters

    Yokogawa's experience with magnetic flowmeters spans decades. Our magnetic flow meters provide flexible configurations for industrial use in most areas.

    See More