Food grade metal detector for food industry / high quality food
metal detector machine
About Shanan.pdf
HOW A METAL DETECTOR WORKS
HOW A METAL DETECTOR WORKS
The most widely-used type of metal detector in the food industry
functions on the principle known
as the "balanced coil" system. This was first registered as a
patent in the 19th century, but the
first industrial metal detector was not produced in the UK until
1948.
The progress of technology has taken metal detectors from valves to
transistors, to integrated
circuits and more recently, into microprocessors. Naturally this
has increased their performance
giving greater sensitivity, stability and flexibility, as well as
widening the range of output signals and
information they provide.
All the same, modern metal detectors are still unable to detect
every particle of metal passing
through them. The physical laws applied in the technology limit the
absolute capability of the
instrument. Consequently, as with any measuring instrument, metal
detectors have restrictions on
accuracy. These restrictions vary depending on the application, but
the main criterion is the size of
the detectable metal particle. Despite this, though,metal detectors
perform a valuable and essential role in process quality control.
About sensitivity
For optimum sensitivity, the search head must be of the size
appropriate for the specified food
product. It's important that the best attainable sensitivities are
established and set for each
product, relating to product size, type and packaging. This process
should only ever be carried
out in consultation with the manufacturer of your metal detector.
If you move your detection systems within your premises, or if you
introduce new products, your
system must be re-evaluated - once again, in consultation with its
manufacturer.
Many leading retailers will insist that their suppliers of private
label goods agree any changes in
metal detection sensitivity settings, with them, in writing. If
your company is a private label
manufacturer, Loma Systems strongly advise you to clarify the
preferred policy with each of your
retailer customers.
Sensitivity adjustment controls must not be accessible to untrained
employees. Access should
only be given to nominated, fully trained staff and for additional
security, the controls should be
password-protected or kept locked.
Obviously, you will want to maximise the sensitivity of your
detection system. However, you need
to guard against potential instability, where the effects of
product/environment could cause false
rejects. You may find the following sensitivities helpful as
guidelines.
Obviously, you will want to maximise the sensitivity of your
detection system. However, you need
to guard against potential instability, where the effects of
product/environment could cause false
rejects. You may find the following sensitivities helpful as
guidelines
Details Tunnel size | 40*12cm | 40*15cm | 40*20cm | 50*15cm | 50*20cm | 50*25cm | 50*30cm |
| Sensitivity Fe(mm) | 0.8 | 1.0 | 1.2 | 1.0 | 1.2 | 1.5 | 2.0 |
| Sensitivity SUS(mm) | 1.5 | 2.0 | 2.5 | 2.0 | 2.5 | 3.0 | 3.5 |
| Detection height | 120 | 150 | 200 | 150 | 200 | 250 | 300 |
| Detection width | 400 | 500 |
| Belt speed |
10-35 meters per minute adjustable |
| Alarm method | Light and sound and optional reject |
Optional reject 1 :Push rod
Optional 2 flap drop
Optional 3 Air blast
Appplication:
Food & Beverage Manufacturers
Food & Beverage Processors
Food & Beverage Distributors
Food & Beverage Storage Facilities
Food & Beverage Importers
