As a custom blending/ packager of stabilizers for the dairy industry, the ingredient division of Crest Food Co. (Ashton, IL) relies on product safety and consistency to assure customer confidence and satisfaction. Core to product safety is its Fortress Technology Phantom metal detector situated just prior to bagging operations.

However, the 54 year-old family-owned company could not just insert any type of metal detector. "Due to spacing in the plant, we required a very small metal-free zone of only two inches on either side of the aperture," says Jim Spangler, engineering manager. "We needed to position the digital signal metal detector at the most terminal point in the process to assure customer confidence as well as satisfy government and independent audits."

Crest produces stabilizers for sour creams, yogurts, buttermilk and cottage cheese dressings. After blending various ingredients, the free-flowing finished product discharges into an auger that feeds product through the four-in. diameter, tube-style metal detector. Product volume ranges up to 150 lbs. a minute. Reject procedures on the digitally controlled system consists of a butterfly valve located three inches past the end of the detector's aperture. If contamination is detected, the butterfly valve automatically closes, an alarm sounds and the feeding system shuts down. Operators know to remove the bag that was in the filler for inspection.