Using a Burmah Castrol strip as shown in your video does NOT tell you that there is sufficient magnetic field in the steel plate for a satisfactory inspection. Repeat the test with a piece of wood rather than a steel plate and you will still get 3 clear indications on the Burmah Castrol strip. The indications are being caused by the magnetism in the air rather than in the steel plate. Burmah castrol strips only provide a reliable indication of magnetic field strength when used to check the level of residual magnetism, or when using direct induction (current flow). They do NOT provide a reliable indication of field strength when using indirect induction (magnetic flow)
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Dear Sir , Can we use the burmah castrol strip for central conductor technique ?
Dang Van Hoi no you use a QQI square
Using a Burmah Castrol strip as shown in your video does NOT tell you that there is sufficient magnetic field in the steel plate for a satisfactory inspection.
Repeat the test with a piece of wood rather than a steel plate and you will still get 3 clear indications on the Burmah Castrol strip.
The indications are being caused by the magnetism in the air rather than in the steel plate.
Burmah castrol strips only provide a reliable indication of magnetic field strength when used to check the level of residual magnetism, or when using direct induction (current flow).
They do NOT provide a reliable indication of field strength when using indirect induction (magnetic flow)