From: Me To: Various People Subject:Metal Detector Critical Limit Validation Test Summary:All three metal detectors were challenged to validate the current CCP Critical Limits. Current critical limits are 3mm for Ferrous and Non-Ferrous and 4mm for Stainless Steel. Methodology:Bread, Bun and Hearth products were grouped by physical characteristics. (size, density, etc.). Samples of each product group were passed throu gh the appropriate metal detector for the type of product. For each product group, and metal type, the current Critical Limit test wand was passed through the metal detector three times to verify that the detector would detect and reject the sample. Successful detection and rejection were annotated on a grid. Next, a test wand .5mm smaller than the current Critical Limit wand was used. The same procedure as above was utilized. If the smaller sized test wand was successfully detected and rejected three times, then a test wand 1mm smaller than the current Critical Limit wand was used and the same procedures as above were followed. Findings/Conclusions: The current Critical Limit test wands were successfully detected and rejected in all product groups. The following table shows the product types rejected for each metal and each size test wand. Product Group Ferrous Non-Ferrous Stainless Steel 2mm 2.5mm 3 mm 2mm 2.5mm 3mm 3mm 3.5mm 4mm Bread (18) 4/18 11/18 18/18 0/18 4/18 18/18 0/18 4/18 18/18 Buns (12) 0/12 1/12 12/12 0/12 0/12 12/12 0/12 0/12 12/12 Hearth (11) 6/11 6/11 11/11 0/11 2/11 11/11 0/11 0/11 11/11 Based upon the results of the validation test, the current Critical Limits for the CCP are correct. Marshall Gourley
Subject: Metal Detector Critical Limit Validation Test
Summary: All three metal detectors were challenged to validate
the current CCP Critical Limits. Current critical limits are 3mm
for Ferrous and Non-Ferrous and 4mm for Stainless Steel.
Methodology: Bread, Bun and Hearth products were grouped by
physical characteristics. (size, density, etc.). Samples of each
product group were passed through the appropriate metal detector
for the type of product. For each product group, and metal type,
the current Critical Limit test wand was passed through the metal
detector three times to verify that the detector would detect and
reject the sample. Successful detection and rejection were
annotated on a grid. Next, a test wand .5mm smaller than the
current Critical Limit wand was used. The same procedure as above
was utilized. If the smaller sized test wand was successfully
detected and rejected three times, then a test wand 1mm smaller
than the current Critical Limit wand was used and the same
procedures as above were followed. Findings/Conclusions: The
current Critical Limit test wands were successfully detected and
rejected in all product groups. The following table shows the
product types rejected for each metal and each size test wand.
Product Group Ferrous Non-Ferrous Stainless Steel 2mm 2.5mm 3mm 2mm
2.5mm 3mm 3mm 3.5mm 4mm Bread (18)
4/18 11/18 18/18 0/18 4/18 18/18 0/18 4/18 18/18
Buns (12)
0/12 1/12 12/12 0/12 0/12 12/12 0/12 0/12 12/12
Hearth (11)
6/11 6/11 11/11 0/11 2/11 11/11 0/11 0/11 11/11
Based upon the results of the validation test, the current
Critical Limits for the CCP are correct. Marshall Gourley
