Hirsch Multipuls MPI and Demag

Specialists in MT Particle Testing and Demagnetization

Hirsch Prueftechnik is a German based manufacturer specializing in the manufacture of Pulsed, Multi-direction, mobile magnetic particle testing machines. Dr. Peter Hirsch developed his first machine to enable safe testing of seam welds in submarines even in wet conditions. Multipuls machines use capacitor discharge to create a high power, short duration DC pulse of only a few milliseconds. Testing can be performed with fluorescent, visible, wet, or dry particles. Indications are sharp and clear. Even with their compact and mobile design, these units facilitate the testing of large surfaces.

Key Features

• Pulsed AC/DC
  • Test large finished parts without fear of arcing
• Multi-directional
  • Detects longitudinal and Transverse flaw at the same time
• Two Magnetizing Circuits
  • Use current flow or Induction in any combination
• Large Area of Coverage
  • Up to ~18 x 18 ft. (6m x 6m)
• Light Weight
  • As light as 33lbs. (15 kg.) (each box)
• Mobile
  • Fits through a hatch or man-hole (Multipuls C-1)
• High Amperage
  • 8,000 to 30,000 Amps
• Demagnetizing
  • Low frequency DC pulses penetrate deeply into the material for a thorough demagnetization
• Low Power Consumption
  • 8,000 Amp machine runs from 220 V/50/60Hz, 18 Amps
  • Larger machines run from 480 V/50/60 Hz, 32 Amps
• Low Operating Expense

Magnetic Poles

Connect cables to the part.
Benefits include:

• High adhesion to the part
• No sparks

The 4 Pole Method is most suitable for planar components (left image) and is used for MT testing as well as demagnetization.

DC Pulse Technology

Perfect for magnetic particle testing and demagnetization. Benefits include:

• Sharp indications
• No false indications
• No arc strikes
• 100% coverage
• Short inspection time
• Lower weight equipment

Magnetizing Methods

• 2 x current flow
• 1 x current flow, 1 induction
• 2 x induction

Device Models

Measuring Equipment & Accessories

Pulse Test Currents, Pulse Test Field Strength and Residual Field Strength

HPT Hirsch Prüftechnik gauge makes relevant measurements for magnetic particle testing and demagnetization. This device is used for inertia-free and non-inductive measurement of pulse test current strength, pulse field strength, and residual field strength.

Measuring device for:

• DC-Pulse current; 0-30,000 Amps
• DC-Pulse field strength; 0-999 A/cm
• Residual field strength; 0-999 A/cm