Method for testing a metal detection apparatus and metal detection apparatus

Abstract

A method allows testing a metal detection apparatus, products are movable through a coil system, a current applied to the transmitter coil induces a first coil signal in the first receiver coil and asecond coil signal in the second receiver coil, that do not compensate one another when metal is present in the products, which causes an input signal within a signal processing path, and the metal detection apparatus is provided with a test device that comprises a test article. The method comprising the steps of moving the test article through the detection zone along a first transfer axis and measuring a first input signal for which a first threshold is determined such that the amplitude of the first input signal exceeds the first threshold; moving an identical test article through the detection zone along a second or further transfer axis and measuring a second or further input signal for which a second or further threshold is determined such that the amplitude of the second or furtherinput signal exceeds the second or further threshold and selecting said first, second or further threshold in the signal processing path whenever the test article is moved along the related first, second or further transfer axis.

Description

technical field [0001] The invention relates to a method for testing a metal detection device and a metal detection device operating according to the method. Background technique [0002] Metal detection equipment is used to detect and eliminate unwanted metal contamination. When properly installed and operated, it will help reduce metal contamination and improve food safety. Most modern metal detectors utilize detection heads that include a "balanced coil system". Detectors of this design are capable of detecting all metal contamination types including ferrous, non-ferrous and stainless steel in a wide variety of products such as fresh and frozen produce. [0003] Metal detection equipment typically includes a metal enclosure with inlet and outlet apertures of different or identically sized cross-sectional areas that define within the enclosure a travel path along which an inspection object moves. [0004] Metal detection equipment operating on the "balanced coil" princi...

AI Technical Summary

Problems solved by technology

A disadvantage of such a test device is that the sensitivity of the metal detection equipment is not measured in other areas of the test area which are more important than the area in which the test device is installed

[0014] However, for different regions of the detection zone exhibiting different sensitivities, the user of the device may use a test article suitable for the sensitivity in a particular region of the detection zone

However, separate detection items such as those provided by manufacturers of metal detection equipment are not suitable for testing in areas of the detection zone that exhibit different sensitivities

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