About Test Cards and Test Pieces

NEEDLE DETECTOR

Our test cards/test pieces are manufactured using iron balls manufactured in accordance with JIS standards.
There are two types: a thin card type and a test piece type. Test piece type is affixed to a sponge, which does not affect the magnetic field of the needle detector, and it can be simply placed flat, vertically, horizontally, or at any other height.
The test card type can be inspected by changing the height in 10 mm increments by using a test stand together.

Test cards and test pieces are manufactured and sold in 5 types, Fe0.8mmφ, Fe1.0mmφ, Fe1.2mmφ, Fe 1.5mmφ, and Fe 2.0mmφ.

In recent years, inspection standards have become stricter, and we have heard requests to purchase Fe 0.7mmφ and Fe 0.9mmφ, but Hashima sells only the above five types.

Our needle detector is designed to detect and react to Fe 0.8mmφ and pass Fe0.6mmφ at the sensitivity setting of 10.9. Ideally, we would like to pass Fe 0.7mmφ as well. Still, the difference in reaction between Fe 0.8mmφ and Fe 0.7mmφ is too weak, and if the material reaction in the negative direction mentioned above occurs, the reaction of Fe0.8mmφ may be canceled. The test card may be lost, so a margin is taken. This is the reason for the margin.

Therefore, we do not manufacture or sell test cards of Fe 0.7mmφ or Fe 0.9mmφ.