Loma IQ3, Руководство пользователя

Страница: 82 / 144

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
The IQ
3
+ 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 Frequencies (KHz)
Band 1 31 71 111 203 300 405 576
Band 2 33 73 115 208 319 416 600
Band 3 35 75 121 211 326 428 625
Band 4 37 77 126 217 333 441 652
Band 5 39 79 131 223 340 454 681
Band 6 41 81 136 231 348 468 714
Band 7 43 83 141 238 357 500 750
Band 8 46 85 146 242 365 517 789
Band 9 48 87 151 250 375 535 833
Band 10 52 89 156 254 384 555 882
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