Magnetic Particle Inspection Field Strength Calculator
Calculate required magnetizing current and field strength for magnetic particle inspection using yoke, prod, or coil methods
Input Parameters
Results
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Field Strength Assessment
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Min Required Current
A
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Est. Field Intensity
A/in
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Recommendation
Note: Per ASTM E709 and ASME Section V Article 7. Prod spacing 3-8 inches. Yoke pole spacing 3-6 inches for best sensitivity. Always verify with pie gauge or Burmah-Castrol strip.
Reference
Yoke: AC lift >= 10 lbs, DC lift >= 40 lbs (ASTM E709)
Prods: 100-125 A/in spacing (ASME V Art. 7)
Coil: L/D <= 3: NI = 35000/(L/D); L/D > 3: NI = 45000/(L/D)
Field intensity H = NI/L (amp-turns per inch)