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Constant Instruments has introduced a free-fall metal detector, which eliminates the likelihood of a particle of metal being found in a packet of crisps.

When used in a weighing and packaging line, for example, the Ceia THS/G21 can be positioned immediately above a bagging machine, where it checks the falling product at high speed for any metal inclusions and can automatically trigger the rejection of any contaminated bags.

The new multi-spectrum unit has a higher detection sensitivity than earlier instruments, enabling it to detect minute contaminant particles at very high flow rates, according to the company.

Non-magnetic and magnetic metals can be detected, including high-grade stainless steel.

The THS/G21 is suitable for inspecting granular foods such as breakfast cereals, potato crisps and other snack products.

‘The instruments can be placed in close proximity with each other without causing interference, enabling two to be located side by side, for example in twin bagging machines for high-velocity applications,’ said Leslie Hunt, managing director.

The THS/G21 is available as a detecting head only for multi-head OEM weighers; alternatively, Constant can supply it as an integrated system including the ejection valve.

Produced by Italian metal detection specialist Ceia, the THS/G21 is designed and manufactured in accordance with FDA 21 CFR Parts 210 and 211 and is fully compliant with HACCP criteria.

With a stainless-steel housing for hygienic operation and to facilitate cleaning, the instrument is principally targeted at the snack-food industry, although it is equally suitable for scanning powders, granules and other loose bulk materials in the pharmaceutical, chemical and plastics industries.

When the THS/G21 is fitted with a reject valve, a contaminated portion of product can be automatically ejected without slowing the production flow.

If mounted on a packaging machine, the unit can send a command not to cut the contaminated bag, so that the double bag can later be identified and manually removed from the production cycle.

The detector constantly monitors its detection characteristics, allowing continuous compensation for any variations arising from environmental factors and giving it a high immunity to external interference.

An Autolearn feature optimises detection sensitivity for maximum speed and precision – equivalent to hundreds of conventional learning transits.

Constant Instruments

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