Industrial Demagnetizers & Demagnetization Systems

Promag

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Demagnetization Systems

High-Performance Magnetic Particle Inspection (MPI) Systems

Streamlining NDT Workflows with Custom Automation & AI Defect Recognition.

Every magnetizing cycle leaves ferromagnetic parts with residual charge — and that charge has to come out cleanly before the part ships, welds, or passes final MPI sign-off. PROMAG demagnetization systems deliver controlled, repeatable field decay across pulse and continuous methods, engineered for automotive technical cleanliness, welding pretreatment, rotating equipment, and post-inspection background control.

Built on 30+ years of demagnetization R&D and field service experience, PROMAG units reduce residual fields below 2 Gauss with 99.5%+ current repeatability accuracy — meeting the toughest automotive, aerospace, power generation, and railway audit thresholds.

Explore Product Lines Demagnetization Methods

0+ Years

Demag R&D & Service

<0 Gauss

Cleanliness

0%+

Repeatability

0 Awdg

Max. Flux

Quality System ISO 9001:2015

Test Method ASTM E1444

Field Standard ISO 9934

Residual Limit < 2 Gauss

Tunnel Demagnetizer

Portable Demagnetizer

Demagnetization Methods

Pulse vs. Continuous Demagnetization

Demagnetization is achieved by applying an alternating magnetic field that starts with an intensity greater than the initial magnetism and gradually decays to zero, bringing the magnetic domains back to a randomized state.

Part Stationary Field decays over time

Method 01 · Stationary Coil

Pulse Decaying Demagnetization

The workpiece remains stationary inside the coil. An alternating magnetic field rises instantly to a peak value, then smooths down to zero under precise microprocessor control of the current, frequency, and waveform.

Penetration: Supports ultra-low frequencies (down to 1 Hz) to mitigate heavy eddy currents in thick-walled parts.

Application: Perfect for deep, thorough demagnetization of heavy, complex geometries without disassembly.

Part Moving Field decays over distance

Method 02 · Conveyor Pass

Continuous Pass Demagnetization

The alternating magnetic field inside the coil remains constant at mains frequency. Demagnetization is achieved by physically pulling the workpiece out of the coil or sliding it away on a conveyor belt.

High Throughput: Extremely effective for mass production lines, automated tracks, and thin-walled parts.

Simpler Utility: Requires lower instantaneous power input compared to deep-pulse structures.

Product Type

Tunnel Demagnetizer Portable Demagnetizer

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Tunnel Demagnetizer

High-power modular generator units coupled with robust tunnel coils (SSM loops) or proprietary rotating fields. Engineered for heavy industrial production runs, bulk materials, inline operations, and complete integration.

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Portable Demagnetizer

An integrated mobile demagnetizer that can be flexibly wrapped around thick-walled pipelines, large bearing shells, and steam turbine rotors, enabling in-situ demagnetization without requiring major component disassembly.

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Accessories, Consumables & More

Beyond our core product lines, explore PROMAG's full range of MPI accessories, consumables, and system components — engineered to work seamlessly with every inspection system we build.

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