The highly integrable solution for the inspection of powders and granules. Thanks to digital signal analysis, it offers an exclusive detection capability for magnetic and non-magnetic metals, including stainless steel. Constructed from AISI 316L stainless steel, it withstands high-pressure washdown and ensures full compliance with FDA 21CFR Part 11 regulations. Its extreme speed allows it to divert contaminants without slowing down the production flow, ensuring maximum safety, integrity, and operational traceability.
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Salads and vegetables
CEIA metal detectors guarantee maximum food safety in the inspection of ready-to-eat salads, fresh vegetables, and greens. Thanks to Multi-Spectrum Technology, THS systems cancel out the product effect caused by high moisture and wash water, eliminating false alarms. With conveyor configurations for heavy washdown environments and gravity fall solutions for bulk products, CEIA protects cutter blades and consumers.
Detecting Metallic Contaminants in Salads & Vegetables Production
Maintaining the highest standards of food safety is essential in the production of fresh salads and vegetables. From ready-to-eat leafy salads to packaged chopped vegetables, producers must ensure that all products are free from physical contaminants before reaching consumers. Among potential hazards, metallic contamination represents one of the most critical risks. Metal fragments can originate from cutting tools, washing and conveying systems, sorting machines, or packaging lines, making advanced detection technologies essential to protect consumers, comply with food safety regulations, and safeguard brand reputation.
Sources of Metal Contamination
Salads and vegetable processing involves a range of mechanical operations, including washing, trimming, cutting, shredding, sorting, and packaging. Over time, normal wear and tear of blades, cutters, conveyors, and other equipment can result in the release of small metal particles. Additionally, raw vegetables may occasionally introduce contaminants from upstream handling or farming processes.
Because these fragments are often very small and difficult to detect visually—particularly in products with varied shapes, textures, and moisture content—automated inspection systems are crucial for identifying and removing contaminated products before distribution.
Metal detection systems can be implemented at multiple points along the production line, depending on the type of product and packaging format.
Conveyor-based inspection is typically used for cut or packaged vegetables, integrating a metal detector with a conveyor belt and an automatic rejection mechanism—such as a pusher, air blast, or retracting belt—to remove affected products from the production flow. These systems are particularly effective post-packaging, ensuring that final products meet safety standards before leaving the facility.
Gravity-fed systems may be applied for bulk leafy greens or granular vegetable products, such as diced onions or shredded carrots, where the product passes through the detector by gravity. This configuration ensures consistent flow and high detection sensitivity, with automatic rejection or line stop options to remove contaminated portions.
In addition to safeguarding product safety, metal detection systems also protect downstream equipment. Early detection of metallic contaminants helps prevent damage to sensitive machinery such as slicers, washers, packaging units, and conveyors, ensuring operational continuity and reducing downtime.
Challenges in Salads & Vegetables Processing Environments
Detecting metal contaminants in Salads & Vegetables Processing Environments presents specific technical challenges.
Salads & Vegetables typically contains high levels of moisture and salt, both of which can affect the sensitivity of detection equipment. Exclusively developed by CEIA, MULTI-SPECTRUM TECHNOLOGY (MS21 and MS210) is a unique metal detection technology that both optimises sensitivity to all metal contaminants and minimizes product effect in a very wide range of possible products.
In addition, product size, shape, and temperature variations may influence detection performance: thanks to CEIA exclusive BKG-A Autolearn function it’s possible to enrich previously acquired product characteristics with additional data to eliminate residual product effect and false alarms.
Industrial environments for Salads & Vegetables production are frequently subjected to intensive washing to allow proper sanitation: for this type of treatment, CEIA proposes the innovative MBH9 conveyor with THS/MS210 technology specifically designed for heavy washdown food-processing areas.
Periodic testing of the metal detector with certified test samples by operators is also an aspect that must be considered, due to the time required to perform this activity: CEIA AUTO-QC™ TEST provides a digital and effective calibration check along with a 0÷100% programmable reduction of the manual verifications, resulting in a corresponding reduction of labour cost, accidental product contamination and product waste.