Question 1

What metal detection sensitivity is required by BRC and IFS food safety standards?

Accepted Answer

BRC Global Standard and IFS Food do not specify absolute metal detection sensitivity figures — instead, they require that the metal detector is set at the highest sensitivity achievable for the specific product and packaging, and that the sensitivity is validated and documented. The sensitivity is defined by the smallest test piece that the detector reliably detects at the set sensitivity (e.g. 2.0 mm ferrous sphere, 2.5 mm non-ferrous sphere, 3.5 mm stainless steel sphere — these are example figures only; the achievable sensitivity depends on the specific product and aperture size). Retailers and food standards bodies often specify their own minimum sensitivity requirements (e.g. 1.5 mm Fe, 2.0 mm non-Fe, 2.5 mm SS) — these are not universal and vary by retailer code of practice. The metal detector sensitivity must be set and validated for each specific product type, because the electrical conductivity and moisture of the product affects the detector's ability to detect small metal fragments.

Question 2

How often must a food metal detector be tested and calibrated?

Accepted Answer

A food metal detector must be tested with certified test pieces at the start and end of each production run (at minimum), and at regular intervals during the production run as specified in the HACCP plan. The test frequency should be based on the risk: how frequently does the metal detector's sensitivity drift or fail? What is the quantity of product that would need to be placed on hold if a failure is detected? More frequent testing (e.g. every 30–60 minutes) reduces the hold quantity in the event of a failure. Every test must be recorded in a dedicated metal detector log that includes: the date and time; the operator; the test piece sizes used; the test result (pass or fail); and the corrective action taken if the test fails. In the event of a failed test, all product produced since the last passed test must be placed on hold and assessed.

Food Metal Detection System Manufacturers

Food metal detection systems — types and HACCP requirements

Food Metal Detection System Manufacturers

Food metal detection systems — types and HACCP requirements

Frequently asked questions

What metal detection sensitivity is required by BRC and IFS food safety standards?

How often must a food metal detector be tested and calibrated?

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