RIDGID metal detector User's Guide Page 19
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About Metal Detection
Phasing
The diagram below shows how the magnetic and conductive properties of a product affect the product
phase angle.
Utilising the ‘Learn’ feature provided in the IQ
3
Metal Detector, an average for the net signal received
from a product during inspection is digitally processed to provide a phase angle and amplitude.
This is then memorised for later recall against the product as a product ‘window’, as shown in the
Product Signal diagram below and essentially provides a ‘filter’ so that signals of a known phase and
amplitude can be ignored. This is called ‘phasing out’ the product signal.
Product Signal
Contaminated Product Signal
The Contaminated Product Signal diagram above shows how a signal from a metal contaminant,
although much smaller than the product signal, can be easily detected.
The metal detector sees the one resultant signal of the metal contaminant and product signals
presented together at the same time.
This resultant signal still falls well outside of the product ‘window’ which then triggers detection and
provides an opportunity for the contaminated product to be rejected from the production line.
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- 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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