Loma IQ3+, Руководство пользователя

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7
About Metal Detection
Industrial metal detectors are used in the pharmaceutical, food, beverage, textile, garment, plastics,
chemicals, lumber, and packaging industries.
Contamination of food by metal shards introduced during the manufacturing process is a major safety
issue in the food industry. Metal detectors are widely used and integrated into production lines and
play a vital role in preventing contaminated products from reaching customers.
The following sections contained in this chapter provide a conceptual overview to explain what metal
detection is, the reasons for metal detection, how metal detection works and how to implement metal
detection successfully:
■
How a Metal Detector Works
All metals are magnetically conductive, electrically conductive or both. When they enter an
electromagnetic field they create a detectable disturbance, or signal, in the field and this is used
to detect the presence of metal contaminants in food and pharmaceutical products.
■
Product Effect and Phasing
Explains what product effect is and how phasing is used to reduce its impact on detecting
contaminants.
■
Tracker Feature
The Tracker feature when enabled, continuously adjusts the product signal threshold
automatically, using the average signal values obtained from a defined number of products that
pass through the aperture.
■
Metal Free Zone
Although the electromagnetic field is generated inside of the detector housing, some of the field
emanates out of the aperture on both sides. This ‘leakage’ area is defined as the Metal Free
Zone.
■
Detector Performance
Provides details of factors that affect the performance of a metal detector and gives typical
levels of detection performance for different product types.
■
Types of Metal
Provides details of the types of metal that typically be detected and the ease of detection,
dependant on their physical characteristics
■
Shapes and Orientation of Metal
Provides information covering how the shape of a metal contaminant and its orientation when
passing through the metal detector aperture can affect its detection.
■
Testing Metal Detector Performance
Regardless of how sophisticated and reliable a metal detector is, it is only as good as the
frequency and thoroughness of the testing programs supporting it. This section provides
guidance for testing your metal detector performance.
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Learn Feature
The Learn feature incorporated into the metal detector completely automates the configuration
of the detector settings for a product. The Learn process options available are described in this
section.