Available in 7 models to handle a range of applications, Eriez Model 1200 Series metal detectors detect ferrous and nonferrous tramp metal in food products, even when conveyed on steel-corded belts; they detect medium and larger particles traveling at speeds up to 1,200ft./min. Operating by measuring the change in received electromagnetic signals of material being conveyed through the sensor area, each model has varying degrees of sensitivity. 
Eriez; 888-300-ERIEZ; www.eriez.com