ZC-9D AC/HWDC Electromagnetic Yoke


The lightweight electromagnetic yoke is the ideal tool for the detection of surface or sub-surface cracks and flaws in any ferromagnetic material. No other low-cost, portable equipment offers such versatility in Magnetic Particle Inspection.

Fast and simple to operate, it is widely used with either dry or wet method fluorescent or non – fluorescent magnetic powders, in the testing of welds, automotive or railroad components, machine parts, steel and grey iron castings, forgings, and in plan inspection, maintenance, and repair.


Replaceable Cord         Replaceable Switch

Water  Resistant            Flexible Grip

DC Convertible ZC-90       Test Result in DC

Technical Specification

  • Input supply – 220V, 50Hz, 1 Ph
  • Input current – 2 Amps
  • The distance across poles – 0 to 300 mm
  • Magnetic field AC – Constant level, DC-Pulsed, infinitely variable.
  • Lifting power Approx. 27 Kg. at 100mm spacing HWDC mode.
  • Yoke Weight 3.5 Kgs approx.
  • Controls On/Off Switch, AC/DC Switch, DC Field intensity potentiometer

AC Electromagnetic Yoke

  • Choice of constant level AC or variable intensity, pulsed HWDC for surface or sub-surface flaw detectability.
  • Solid state circuity for infinitely variable (step less) potentiometric adjustment of DC magnetic field.
  • Articulated legs to suit differing component contours.
  • Interpol distance adjustable from 0 to 300 mm.
  • Low power consumption. Current draw at 220V, 1 Phase supply – only 2Amps.
  • Extremely strong and intense magnetic field for superior sensitivity.
  • Portable & light weight – only 3.5 Kgs.
  • Can be used for AC Demagnetization too.
  • No risk of sparking or ‘hot spots’ on the job.
  • No current flows through the component being tested.
A.C. Magnetisation D.C. (Pulsed) Magnetisation
  • Creates a surface field which only detects surface cracks.
  • Particularly useful for inspecting thick and irregular sections for surface defects such as fatigue cracks.
Use of Half Wave D.C. Magnetisation creates a pulsing magnetic field with penetrates the work piece and detects surface and subsurface (Slightly) cracks. Pulsing improves particle mobility and sensitivity. Can be used for dry and even wet method.


Product Properties Application Aprovals/Confirms
  • NDT Type: Fluorescent Magnetic Particle Testing


Ideal Application: Infrequently used systems, Inspections where corrosion protection is vital, On high strength alloys, When maintaining particle concentration is critical, When water might pose an electrical hazard
  • ASTM E-I444
  • ENISO 9934-1, ASTM E709
  • ASME Boiler & Pressure Vessel. Section V, Art 7




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