Mark I Accelerator Magnetic Leak Detector

SKU: 44701

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Ultra-high sensitivity 3-axis passive magnetic leak detector (0.3 Gauss / 30µT) Mark I Magnaprobe. Ideal for particle accelerator diagnostics, mu-metal shielding verification, and beamline stray-field mapping.

Magnaprobe Mark I Ultra-High Sensitivity Magnetic Leak Detector

The Magnaprobe Mark I is an ultra-high sensitivity, passive 3-axis mechanical magnetic field detector engineered to identify microscopic flux leakage and validate magnetic shielding integrity. Responding instantly to localized fields as low as 0.3 Gauss (30 µT), this non-contact diagnostic tool isolates structural weak points without the risk of electronic saturation or RF interference.

Key Accelerator & High-Precision Applications:

  1. Shielding Integrity: Detects localized leakage zones caused by mechanical welding, custom cuts, or cable routing slots in mu-metal enclosures.
  2. Stray-Field Mapping: Tracks real-time 3D vector alignments and fringe field paths across physical containment boundaries.
  3. Zero-Biasing Diagnostic: Provides zero-power mechanical tracking, trusted by institutions like CERN for sub-Gauss environment troubleshooting.
Details Specs Reviews
Details

High-energy physics institutions like CERN have utilized the Mark I precisely because no other handheld device provides instantaneous, mechanical 3D vector alignment at sub-Gauss thresholds1.

1) Personal communication, Malcolm Cochrane, Cochranes of Oxford, 1995.

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Specifications

Particle Accelerator Specifications Table

Feature / Metric Optimized Specification Text Technical Context for Accelerator Use
Sensitivity Threshold 0.3 Gauss (30 µT / 0.03 mT) Detects weak stray fields outside containment boundaries.
Measurement Axes Fully decoupled 3-Axis (X, Y, Z) gimbal alignment Pinpoints the exact 3D exit vector of a structural magnetic field leak.
Operating Principle Passive Mechanical (No power or batteries required) 100% immune to high RF interference, electrical noise, and radiation fields.
Magnet Composition High-coercivity Alnico tipped indicator pointer Resists environmental demagnetization when clearing strong field zones.
Primary Utility Mu-metal shielding & cryostat boundary validation Identifies microstructural shield degradation from stress, cuts, or welds.
Reviews (1)
2018-01-30

I have bought several of these over the years, originally from the British company that makes them, and more recently from this company. I have trouble keeping them because everyone seems to want one. They are indispensable for showing the angle of the magnetic field in three dimensions. It is like a 3 dimensional compass, and very sensitive too. It will even show the vertical angle of the Earth's magnetic field! If your business is magnets, you need one of these.

— Mark
— Indigo:

Thanks for the feedback. This version, the Mark I is incredibly sensitive as you noted. We had them tested once & the will respond to a field as weak as 0.3 gauss. Besides declination they are great for detecting magnetic leakage in NMR/MRI labs. Overkill for Q/A though, use the Mark II instead.

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