Demagnetiser unit removes residual magnetism after magnetic particle inspection in non-destructive testing, Demagnetization of ferromagnetic parts, Industrial Demagnetizing is not an easy task, unless an effective demagnetizing system is used. It is especially difficult when the magnetic field must be reduced to a very low level. Types of Demag System 1. Compact Table-Top with SS Chute. 2. Track & Trolley. 3. Conveyor Type.