Critical limit and verification for magnet trap as CCP

hi guys. I would like to ask what should be the critical limit for magnet trap? if it is the CCP of the process for physical hazard such as metals? and how should we do verifcation? thank u

As you are using the trap, I believe you are pumping food through a processing line, and require no ferrous contaminants after that point?

It should therefore be picking up 100% of metal contamination if working properly, meaning your tolerance level will be zero using such equipment. (Meaning any metal/ferrous contamination in the product would be over the critical limit).  If any small sized particles can make it through the trap your manufacturer would have specified that to. As a result I believe your regime should include sampling of product after the trap along the line, and the maintenence schedule, calibration and even this verification should have been laid down by the manufacturer if this is a food grade equipment.