A successful verification check sha

A successful verification check shall detect and reject three successive challenges for each test unit. For those situations where three successive challenges may be difficult to accomplish, one challenge for each test unit is acceptable during the production run; however, three successive challenges are still required at start up and at finish. An example of this might be a system where detection is conducted just prior to packaging of a bulk ground meat product that is conveyed in line and insertion of the test unit is quite complicated. Product used in the verification checks shall be re-run through the detector after the test units have been removed from the package to ensure that the product itself is free from metal contamination and has not influenced the test. Frequency of verification checks during production and test metal samples used shall be sufficient to assure continued accurate performance. Some customers may require specified verification frequencies and test metal samples used. A verification check of the detector performance shall bemade on the last product run during the shift or lot. This will provide documentation that the detector was functioning properly from beginning to the end of production.