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About the Metal Detector Range
Reject Devices
Reject Devices
Loma Systems offer a range of reject devices for removing contaminated products from your
production line, based on a number of factors including the product type, its general dimensions, the
general set up of your production line and of course how you wish to handle contaminated products.
The following reject devices are available and may be fitted to your machine:
■
Stop On Detect (SOD)
The Stop-On-Detect reject device causes the conveyor to stop moving and an alarm to sound,
indicating that a contaminant has been detected.
■
Air Blast
The air blast reject device uses a high pressure blast of compressed air to push a
contaminated product off the belt into the reject bin.
■
Pusher
The pusher reject device pushes the contaminated product off the belt into the reject bin.
■
Plough
The plough reject device swings across the belt to divert the contaminated product off the belt
into the reject bin.
■
Retracting Band
The retracting band reject device uses compressed air to activate a carriage retracting
mechanism to create a gap in the conveyor belt. The contaminated product then falls through
the gap and into a reject bin, which is mounted on the underside of the conveyor.
■
Powered Decliner
The powered decliner reject device uses compressed air to activate a carriage declining
mechanism which guides the contaminated product into a reject bin mounted on the
underside of the conveyor. The carriage then returns to its original position,
■
Signal Only
Alternatively, a conveyor can be supplied without a reject device but with ‘Signal Only’ output.
On detection of metallic contaminant in the product, the control unit provides an output signal
only. This conveyor can be used in conjunction with the customer’s choice of equipment.
As standard, a reject cover is fitted over the outfeed part of the belt and the reject device. This
protective device is intended to stop any part of a person’s body from being placed within the
operating area of the reject device. The Stop-On-Detect reject is not fitted with a reject cover.
Stop On Detect
Stop On Detect is the simplest type of reject device available which is most suitable for removing
heavy, awkward shaped and continuous strip contaminated products from your production line.
When a contaminated product is detected the conveyor belt will stop and an alarm will sound,
allowing you to remove the product from the conveyor belt and dispose of it in accordance with your
local procedures.
After removal of the contaminated product, you must then manually restart the conveyor.
Stop On Detect reject device are suitable for use with systems where a maximum of 60 packs are
being presented for inspection per minute and the maximum individual pack weight is 60Kg.
55
- 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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