Test pieces detection vs contaminant size

This is quite confusing for me, if I have a metal detector installed in the area, and I have set my test piece sensitivity to ferrous 1.2 mm (sphere), 2.5 mm Non ferrous (sphere), and 3.0 mm Stainless Steel  (sphere), will i be able to detect a 3.16 mm X 7 mm welding rod.?

This is quite confusing for me, if I have a metal detector installed in the area, and I have set my test piece sensitivity to ferrous 1.2 mm (sphere), 2.5 mm Non ferrous (sphere), and 3.0 mm Stainless Steel  (sphere), will i be able to detect a 3.16 mm X 7 mm welding rod.?

Insufficient data. eg -

Sensitivity determined how ?

magnetic field symmetical ?

welding rod made of ? circular x-section ?

3.16mm  is presumably the diameter ? uniformity +/- ?

xy orientation of rod = ?

PS - i anticipate the reason for the OP is that it wasn't detected ? :smile:

Hello jayrency,

Test piece size is the minimum size your metal detector can detect. 

regards,

redfox

JFI, I noticed this (semi-promotional) caveat in another article -

Detection Capability.png   34.4KB   6 downloads

This is part of one from an audit. And I was not able to attend to. I know that there may be factor affecting the sensitivity nor the detection of contaminant.

1. Material property

2. Type of rod material

3. Orientation during the passes.

If a 3.16 mm X 7 mm welding rod passes through the MD with a 3.0 mm sphere SS setting minimum limit, it should be detected right?

Can you show me the computation based on  the mathematical dimension?

This is part of one from an audit. And I was not able to attend to. I know that there may be factor affecting the sensitivity nor the detection of contaminant.

1. Material property

2. Type of rod material

3. Orientation during the passes.

 

If a 3.16 mm X 7 mm welding rod passes through the MD with a 3.0 mm sphere SS setting minimum limit, it should be detected right?

Can you show me the computation based on  the mathematical dimension?

Hi jayrency,

Perhaps you could answer some of the queries in Post 3

MD performances are discussed in the manufacturer's files attached in this post -

http://www.ifsqn.com...tor/#entry54841

You will see from various posts in this Forum that any MD is likely to occasionally exhibit false positives and false negatives. Sometimes for unknown reasons.

This is quite confusing for me, if I have a metal detector installed in the area, and I have set my test piece sensitivity to ferrous 1.2 mm (sphere), 2.5 mm Non ferrous (sphere), and 3.0 mm Stainless Steel  (sphere), will i be able to detect a 3.16 mm X 7 mm welding rod.?

Hi jayrency,

I deduce yr rod is nominally 1/8 in diameter.

These are some reasons why yr OP is difficult to accurately answer  -

1st reason