RIDGID metal detector User's Guide Page 17
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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.
■
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.
7
- Metal Detector User Guide 1
- Table of Contents 3
- Introduction 11
- About this Guide 12
- Organisation 13
- Document Change Control 14
- Document Key 14
- The Loma Group of Companies 16
- About Metal Detection 17
- How a Metal Detector Works 18
- Product Effect and Phasing 18
- Phasing 19
- Tracker Feature 20
- Metal Free Zone 20
- Detector Performance 20
- Types of Metal 22
- Test Frequency 23
- Product Test Samples 23
- Test Wands 24
- Testing Guidelines 24
- Test Records 24
- Learn Feature 25
- Safety First 27
- Safety Awareness 28
- EC Declaration of Conformity 28
- Safety Warnings 29
- Safety Labels 31
- Safety Guards 32
- Safety Measures 33
- Intended Use of the Machine 33
- Noise Levels 34
- End of Life Treatment 34
- Emergency Procedures 34
- Quality Assurance 35
- End User Licence Agreement 36
- Technical Specifications 37
- European Belt Conveyors 38
- Installation 39
- Warnings 40
- Receiving and Unpacking 40
- Moving the Detector Head 40
- Nuisance triggering 45
- Moving Metal 46
- Vibration 47
- Belting 47
- Electrical Interference 47
- Warnings 52
- Moving the Machine 53
- Clearance Requirements 54
- Connecting the Air Supply 54
- Checking Guards 57
- Site Considerations 58
- Radio Frequency Interference 59
- Metal Detector Search Heads 62
- Conveyor Belts 63
- Plastic Modular Belts 64
- Reject Devices 65
- Electrical Services Box 67
- Air Pressure Switch 67
- Optional Equipment 68
- Getting Started 71
- threshold 72
- display 72
- changes 72
- User Access 75
- Logging In and Out 76
- Starting and Stopping 77
- Stopping the Machine 78
- Emergency Stop 78
- Using the Metal Detector 79
- Handling Rejected Products 81
- Getting the Results 82
- Frequency Selection 82
- Operating Instructions 83
- Setting the Language 84
- Setting the Machine ID 84
- Setting Up the Search Head 86
- Setting Up the Conveyor 88
- Setting the VF Balance 92
- Setting the VF Drive 94
- Setting Up the User Options 95
- Setting Up Serial Links 96
- Reject Relay 101
- Reject Timing 101
- Adding a New Product 102
- Learning Products 104
- Full Learn 105
- Update Learn 106
- Learn Messages 107
- Learn Setup 108
- Learn Limits 110
- PQ span? 111
- Using Performance Validation 112
- Logs and Reports 117
- Errors Report 118
- Example Problems 119
- Faults Report 120
- Setup Report 123
- Contaminants Report 124
- Learn Report 125
- Status Report 126
- PV Test Report 126
- Batch Report 127
- Shift Report 128
- Contaminants Log 128
- Errors Log 129
- Faults Log 130
- Printing the Faults Report 131
- Clearing a Fault 131
- Clearing the Log 131
- Batch Log 132
- PVS Log 133
- Shift Log 134
- Maintenance 135
- Cleaning solutions 136
- Belt conveyor versions 136
- Conveyor Belt Maintenance 137
- Adjusting the Reject Devices 138
- Software Upgrades 138
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