Configuration and Set up Information
Module 7026
5-41
PRINCIPLES OF OPERATION
Inside the metal detector an electromagnetic field is used, operating at a similar
frequency to that used in AM broadcasting, through which the product passes.
This field interacts with both the product and any metal contamination within it, in
such a way that the interaction is measured to determine whether or not the
product is contaminated.
Figure 1 Metal detector with rectangular aperture and belt conveyor
A typical detector is shown in Figure 1. It consists of a metal box with an
aperture through which the product passes, and a control unit that processes
the signals. Inside the metal box, referred to as the search head, there are
three coils surrounding the aperture arranged as in Figure 2. A central
(transmitter) coil is driven by a powerful oscillator to generate a strong magnetic
field within the aperture, through which the product passes.
Search head
Summary of Contents for IQ2
Page 92: ...Maintenance Module 8023 6 1 Frequency links Tx Inductors Balance inductors ...
Page 101: ...Wiring Diagrams Module 10088 8 2 Figure 1 Optional External Sensor Connection Ladder Diagram ...
Page 102: ...Spare Parts Module 11050 9 1 SPARE PARTS CONTENTS Spare Parts Lists 2 ...
Page 104: ...Service Return Module 12005 8 1 SERVICE RETURNS FORMS CONTENTS Instructions 2 Form 3 ...
