The MET 30+ hf detector remains robust and reliable at peak sensitivities by employing a single high frequency, crystal controlled oscillator. Designed primarily for dry product applications within the snack food and bakery industries, the unit will inspect foods such as biscuits or crisps at a frequency of 875Khz – four times higher than standard food industry detectors. The sophisticated software of the MET 30+ hf also eliminates the need to reconfigure the settings for each product, therefore reducing downtime whilst increasing efficiency and operating speeds.
Even with the most stringent quality control programmes in place, tiny flakes or slivers of metal from machinery ‘wear and tear’ as well as swarf or wire from sieves, cutters or drilling during maintenance work can infiltrate the line and contaminate the product at any stage during the food manufacturing process. It is the pure, high resistance non-ferrous and stainless steel metals that pose major challenges to standard metal detectors due to their non-magnetic, non-conductive nature, but the high 875khz frequency of the MET 30+ hf is designed with this challenge primarily in mind and its increased sensitivity performance can therefore guarantee the highest level of product integrity available, offering welcome peace of mind for food manufacturers.
The system is currently available as a horizontal unit, employed at the end of the line for final screening of dry, polywrapped, finished products. Lock is however also developing a Waferthin model for space-restricted lines as well as a Vertical Fall option for free-flowing goods such as coffee granules, sugar and cocoa later this year.
The launch of the high-frequency detector has also built upon the proven technology of Lock’s existing MET 30+ 3f multi-frequency metal detector. Operating with three crystal oscillator frequencies of high, medium and low, the MET 30+ 3f model incorporates an Automatic Frequency Selection facility which chooses the optimum frequency in which to inspect each individual product type. For example, when inspecting a polywrapped product the detector will automatically select a high frequency, but for a product packed in metallised film a more appropriate medium or low frequency will be allocated in order that the detector can successfully ‘filter out’ the signal from the packaging itself. By utilising a MET 30+ 3f therefore, a food manufacturer no longer has to compromise the achievable sensitivity of one product type in order to satisfy the lower frequency demands of another – thanks to Lock, a single detector can now be used to inspect all products regardless of their packaging, temperature and moisture content whilst still maintaining optimum performance.
Furthermore, the MET 30+ 3f incorporates a unique design of three discrete quartz crystals for each of the three oscillator frequencies, therefore providing an inherent accuracy in automatic frequency selection compared to the traditional and more limited metal detector design whereby a single crystal is required to oscillate across a wide frequency range.
Both the MET 30+ hf and MET 30+ 3f detector models can also be incorporated with Lock’s powerful new user-friendly Touchscreen control panel. The bright, EL panel incorporates Lock’s ADC Software which provides a unique ’window into the detector’ and allows the operator to view all data graphically on the machine interface itself, including the different signals produced by the product and all three of the types of metallic contamination – ferrous, non-ferrous and stainless steel. As well as providing a valuable powerful on-screen diagnostic tool for both product setup and troubleshooting, the MET 30+’s fully digital software also permits all product and detection information stored in the machine to be downloaded to a printer, PC or local computer network via the system’s integral communication port, permitting in turn sophisticated recording, storage and analysis of the detection data.
Hitesh Hirani, Technical Director at Lock comments:
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