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Using the Metal Detector
Getting the Results
Before using the metal detector with a new product it is important to learn the product, to allow the
metal detector to adjust itself to the highest possible sensitivity.
The metal detector will either learn on the signal from the product, or if there is insufficient signal, will
use reference learn settings. This reference signal is chosen to maximise the sensitivity of the metal
detector, so it is always preferable. However, where a product generates a signal in the detector,
referred to as product effect, then the detector must learn this signal instead (otherwise good product
will falsely be rejected).
When there is no signal from the product this is because they are non-conductive in nature, usually
because they are dry (low water content) such as tea and coffee. Frozen products are also dry in
nature because water cannot conduct when it is frozen. During a product learn, the detector will
automatically sense if it is possible to run dry (use the reference learn setting), but this can also be
forced by selecting DRY YES in the product menu.
Frequency Selection
3
The IQ
+ Metal Detector can run at a choice of seventy different operating frequencies so that the
optimum frequency can be chosen for any given product. Generally, dry products run at high
frequencies, but more conductive and non-uniform products run at low frequencies.
The frequencies are split into 10 bands as shown in the table below. This resolves any issues with
cross-talk between two metal detectors working in close proximity. By setting one detector to use the
available frequencies in a different band to the other detector they will never be operating on the
same frequency.
Band
Band 1
31
Band 2
33
Band 3
35
Band 4
37
Band 5
39
Band 6
41
Band 7
43
Band 8
46
Band 9
48
Band 10
52
Because only the most experienced user will be able to correctly choose the optimum frequency, the
product Learn process on the metal detector will automatically select the most suitable frequency. To
allow the metal detector to select the best frequency, simply go to Menu>Learn>Set Up and select
the Auto-Frequency option.
Where several detectors are sited close together, it is essential that they do not run at the same
frequency. This is achieved by allocating them separate frequency bands, which will have been set as
part of the commissioning process.
72
Frequencies (KHz)
71
111
73
115
75
121
77
126
79
131
81
136
83
141
85
146
87
151
89
156
203
300
208
319
211
326
217
333
223
340
231
348
238
357
242
365
250
375
254
384
405
576
416
600
428
625
441
652
454
681
468
714
500
750
517
789
535
833
555
882
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