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Analysis of the detection limit of Thermo Fisher metal detectors for non-ferrous and stainless steel particles
Date: 2025-12-19Read: 1
Metal contamination detection is crucial in food safety and drug quality control. Compared to iron foreign objects that are easily magnetically attracted, non-ferrous metals (such as copper and aluminum) and austenitic stainless steels (such as 304 and 316) are significantly more difficult to detect due to their weak conductivity and lack of magnetism.Thermo Fisher Metal DetectorBy utilizing high-frequency electromagnetic induction and advanced signal processing technology, this bottleneck can be effectively overcome.
The detection limit is influenced by multiple factors:
Metal type: At the same size, iron balls are easier to detect (with higher sensitivity), followed by non-ferrous metals, and stainless steel is more difficult to detect;
Product effect: High salt and high moisture products (such as meat products and sauces) can generate strong interference signals, masking tiny metals;
Aperture and frequency: A small aperture (detection window) combined with high frequency (>800 kHz) can enhance the response to particles.
Taking typical models as an example, in dry powder products,Thermo Fisher Metal DetectorCan stably detect non iron balls with a diameter of 0.3 mm and 316 stainless steel balls with a diameter of 0.4 mm; In wet products, this limit may decrease to Φ 0.8-1.0 mm. To enhance sensitivity, the device adopts "phase analysis+digital filtering" technology to accurately distinguish product signals from metal signals.
In addition, Thermo Fisher offers a "product learning" feature: the device automatically collects blank product signals and establishes a benchmark model to dynamically compensate for product effects, thereby releasing higher detection sensitivity. Combined with the automatic testing ball verification system, it can ensure the reliability of all-weather detection.
In short, although stainless steel particle detection is still a challenge in the industry, through reasonable selection, parameter optimization, and regular verification, Thermo Fisher metal detectors can provide protection capabilities close to theoretical limits for high-risk products, and build a solid quality and safety defense line.