Menu
access
PowderProcess.net
Engineering Resources
Solids
properties and flow
Unit
operations
Equipment
Handbook
Mixing
Handbook
Pneumatic
transport
Process Safety
Handbook
Spray
Drying
About
Welcome to

Industrial Metal Detector

Detection and removal of Foreign Bodies from bulk solids processes

Follow us on Twitter 
Question, remark ? Contact us at powder.process@protonmail.com


Section summary
1. Technology of metal detectors
2. Rejection
3. Chosing the right metal detector

Metal detectors are totally different than simple magnets. They are not going to trap metals but will detect metal presence in a product stream and possibly reject it. This page is essentially focused on gravity fall - free fall metal detectors.

1. Technology of metal detectors

How is the detection performed ?

When metal is passing through the metal detector, it will change the magnetic field that is applied by the metal detector. This disruption will allow the detection of the presence of metal.

2. Rejection

How are metal detectors removing foreign bodies ?

Metal detectors can be equipped with a rejection. It takes most often the shape of a flap that is opened as soon as the metal detector spots the presence of metal in the product flow.
Each time a diversion occurs, some product is lost, it is important not to have false detection otherwise a lot of losses will be generated.

3. Chosing the right metal detector

What are the parameters guiding the choice of metal detectors ?

The following parameters must be taken into account when chosing a metal detector : the product throughput to handle, the location of the metal detector and the sensitivity targetted

Table 1 : Metal Detector design criteria

Design parameter Consideration to keep in mind
Detection limit Metal Detector Diameters
Throughput
Minimum powder speed Distance powder point of chute - entry of metal detector
Powder max throughput Ensure that the powder flow is roughly dosed
Metal detector Diameter
Performance check Access to Metal Detector entry - introduction of test balls / rods
Position in the process The majority of metal detector are used in gravity fall application but some manufacturers can propose metal detectors designed for pneumatic conveying line for instance

Other related sections

Sifter / Vibrating sieves

Magnets



Copyright www.PowderProcess.net

The content of PowderProcess.net is copyrighted but no warranty nor liability is ensured. The content of this site is to be seen as a help and important information and calculation must always be double checked by the user through the quality procedure of his organization or by checking another source. The user must always respect all applicable regulation. The use of the information is at the user and its organization own risk and own cost.

www.powderprocess.net is secured by SSL encryption

Follow us on Twitter