The ADMAG AXR two-wire magnetic flow meter can be installed in the two-wire system without any AC power source, thus drastically reducing the initial instrumentation cost. 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. Like the AXF four-wire magnetic flow meter series, the ADMAG AXR has user-friendly functions such as a full dot-matrix LCD indicator, electrode adhesion level diagnosis function, and a multi-lingual display. The magnet switches can be used for checking and setting parameters without opening the case cover.

Note: The "Dual Frequency Excitation Method" is a Yokogawa's innovation.


2-Wire Benefit

An Extra AC power supply is not necessary. 2-wire loop powered performance allows direct connection to DCS I/O card possible - allowing for real cost reductions.

  • Reduce the CAPEX and OPEX on your site.
  • Power saving : 1 to 4% power consumption of typical 4-wire magnetic flowmeter.
  • Annual CO2 emissions can be reduced from approximately 73kg to 1.4kg (compared to a standard 4-wire magnetic flowmeter).


Dual Frequency Performance

Only YOKOGAWA can provide unique and advanced excitation method.
"Dual Frequency Excitation" achieves stable measurement, zero stability and quick response times. The exclusive technology for stable and reliable measurement on your site.

Noise reduction technology

Flow noise reduction is further achieved by incorporating smooth mirror finished PFA liners and special surface finished electrodes. This is further enhanced with aligned super high density coils that generate a stronger magnetic field.



YOKOGAWA believes safety should not be an option, it should be standard in all modern products. AXR is the first 2-Wire Magmeter of SIL2 Safety Integrity Level (IEC 61508) certified. AXR is capable of SIL2 single use and SIL3 redundant use, as standard.

Parameter Operation

AXR has magnet switches for parameter setting. Users can access the functions without removing the case cover in hazardous, humid, and dusty environment.


HART 7 support

In addition to HART 5, the new ADMAG AXR supports HART 7, the latest HART protocol, eliminating the need for convertors to connect with HART-compliant control systems. HART 7 also supports and enables the automatic issuance of alarms when the device's settings are modified or a problem is detected by self-diagnostics.

Adhesion Diagnostic Level Function

The electrode is one of the most important parts of a Magnetic flow meter. Only YOKOGAWA has "Adhesion Diagnostic Level Function". It diagnoses the condition of electrode surface and indicates the adhesion/coating in 4 levels. Users can change the detection level (threshold) depending on each individual process condition. This allows for predictive maintenance and reduced operating costs.

Alarm Indication

YOKOGAWA employs Full-dot matrix LCD indicator. It can display up to 3 lines as required by the user and is available in multiple languages. Under the unit has an alarm, a clear message is displayed along with a solution.


About OpreX

OpreX is the comprehensive brand for Yokogawa’s industrial automation (IA) and control business and stands for excellence in the related technology and solutions. It consists of categories and families under each category. This product belongs to the OpreX Field Instruments family that is aligned under the OpreX Measurement category.  


High Performance and Excellent Functionality

Field-proven dual frequency, now by 2-wire magmeter
The "Dual Frequency Excitation Method" combines two strengths: stability in flow measurement due to low frequency excitation and high noise resistance due to high frequency excitation. Therefore, the method is strong against fluctuations of fluid condition and is ideal for stable measurement.

High Accuracy 

The ADMAG AXR performs 0.5% of rate under normal flowrate conditions.   

Reducing the Instrumentation Cost

Direct Connection with the DCS
AC power sources are not necessary. The ADMAG AXR can be connected with almost all distributors, signal conditioner cards, and input modules.

Energy Saving
Compared with four-wire magnetic flow meters, the ADMAG AXR can drastically decrease power consumption (1 to 4%).

User-friendly Functionality 

Enhanced Diagnostic Function
By checking the level of the insulating substance on the electrodes, it is possible to determine when maintenance is required.

Clear and Versatile Indications 

The full dot-matrix LCD indicator facilitates various displays such as one to three lines and multi-lingual display.  In an alarm condition, a full description of the countermeasure is indicated.

Parameter Setting 

Magnet switches and push switches are employed.
Magnet switches enable parameters to be set without opening the case cover in the hazardous area.

Structure Integral flow meter
Excitation Method Dual frequency excitation
Nominal Pipe Size
[Unit : mm (approx. inch)]
General-purpose use: 25 (1.0) to 200 (8.0)
Explosion proof Type: 25 (1.0) to 100 (4.0)
Supply Voltage Operating voltage range 14.7 to 35 V DC Two-wire system
Output Signals Current output
Digital output (One output can be selected from pulse, alarm or status outputs.)
Electrode Material Stainless steel-JIS SUS316L (AISI 316L SS/EN 1.4404 equivalent), Hastelloy C276 equivalent, Tantalum, Platinum-iridium
Fluid Temp. - 40 to 130 deg.C (-40 to 266 deg.F) [ depends on model type ]
Ambient Temp. - 40 to 55 deg.C (-40 to 131 deg.F)
Accuracy 0.5% of rate (Note 1)
[ depends on nominal pipe size and fluid condition ]
Fluid Conductivity 10 micro-S/cm or larger
[ depends on nominal pipe size and fluid condition ]
Lining Fluorocarbon PFA (Mirror-finished lining surface) (Note 2)
Lay Length
[Unit : mm (approx. inch)]
Lay length code 1: Wafer ; size 80 (3.0) to 200 (8.0), Flange ; size 25 (1.0) to 200 (8.0)
Lay length code 2: Wafer ; size 25 (1.0) to 200 (8.0)
Indicator Full dot-matrix LCD
Operational Switch 4 magnet switches (including push switches)
Self Diagnosis Electrode adhesion diagnosis, Coil open, etc.
Alarm Message Alarm message with countermeasure is indicated
( English, German, French, Italian, Spanish, Japanese )
Options Direction change of the electrical connection, Special Gaskets,

* Please refer to General Specifications in detail.

Note 1: The accuracy of a product before shipment is defined as totalized value at the result of calibration test in our water actual flow test facility.

Note 2: Mirror finished PFA lining is standard for size 25 to 100 mm (1 to 4 in.) and optional for size 150 to 200 mm (6 to 8 in.) specified by optional code PM.


Application Note

The ADMAG AXR is the world's first 2-wire magnetic flow meter which employs the unique "Dual Frequency Excitation Method," achieving 0.5% of rate of best-in-class accuracy and excellent stability for process measurement. In addition, the newly developed AXR key technologies," 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.


This paper introduces the ADMAG AXR 2-wire magnetic flomwmeter solution for chilled water application in air conditioning unit.


This paper introduces the ADMAG AXR 2-wire magnetic flomwmeter solution for dust collection water application of steel converter.


The new digester magmeter enabled accurate and stable flow measurement of the black liquor circulation line, helping the user to stabilize the cooking degree that determines the quality of the chip digesting process.

Yokogawa Technical Report

More than half a century has passed since Yokogawa developed Japan's first magnetic flow meter for industrial use in 1955, and today, Yokogawa's magnetic flow meters are widely used in a variety of applications thanks to features such as low pressure loss and maintenance-free operation due to no obstacles and moving parts in the fluid flowing pipeline.


Control Engineering Asia, March 2012

Enabling the operational benefits of two-wire magnetic flow meters while maintaining the performance levels associated with traditional four-wire devices.


Technical Information

2D/3D Configurator


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