Operating Instructions
201
Learning Products
An essential part of inspecting products is to set up the metal detector parameters specifically for
each product to optimise the detectors performance for each one. Loma metal detectors provide a
Learn feature which automates this process.
The Learn process to be followed for both Full and Update Learns is defined in the
Auto-Learn
Settings and Learn Setup screens.
The metal detector provides three alternative Learn processes:
■
Full Learn
This process must be carried out initially on all products as it automatically configures and
populates the system settings and parameters based on effect of the product on the
electromagnetic field as the product passes through the inspection aperture.
The product samples used for the Learn process must be free of metal contaminants and fully
representative of the normal products to be inspected.
Following a Full Learn, any manual adjustment to the settings for a product can be accessed
through the Learn Setup
screen.
■ Update Learn
This process is only available if you have previously carried out a Full Learn process for the
product. It fine-tunes the phase value to minimize the signal, while still checking for metal in the
product. Use an Update Learn to update the signal when the production line is running if false
rejects are occurring because the signal has drifted.
■
Reverse Learn
This process is only available if the Reverse detection option has been enabled in the
Service
Options screen. It is used in situations where for example a product must contain a
contaminant, perhaps a toy car or whistle, and the metal detector is being used to reject
products that do not contain one.
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