Metal Detectable Pens / Markers |
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"Every food processing facility that uses metal detectors to eliminate foreign objects contamination, must calibrate their detectors to the food they are processing and then set to a threshold. The threshold is determined by the company in regards to the size of contaminant they want the detector to reject. The type of product passing under the [Metal] detector (dry or wet), it’s size, speed of the line and orientation also have an effect. These companies must maintain the calibration of these [metal detectable] units by passing a known size of Ferrous,Stainless Steel or Non Ferrous test sticks or spheres under the unit to make sure they are calibrated correctly. All manufacturers of metal detector heads have these testing products available for companies to use to maintain the correct calibration of these metal detectors. It is critical for the processor to continually check calibration as the same product can possibly give off a different signal due primarily to moisture content of the product. (As a block of Ice Cream melts it needs to be re-calibrated due to the increase in moisture content). Without continuous calibration the [metal detectable units] can allow larger pieces of foreign contamination to get through compared to their threshold settings."
Reference:
Detectapro.(n.d.).Estimated detectability of our products. Retrieved on October 29, 2008 from
http://www.detectapro.com/basics/
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