Metal Detection Systems

The sensitivity of an industrial metal detector depends on the application, the manufacturer, and the specific detection system used. Sensitivity is measured by the size of a metal sphere that the detector can reliably identify when placed in the center of the detector's tunnel. Larger tunnel openings reduce the detector's sensitivity.

Dry products, such as candy and cereals, are easier to inspect. Detectors that operate at high frequencies (around 800 kHz and above) provide higher sensitivity and are particularly effective at detecting stainless steel contaminants.

For wet or conductive products like fresh meat, poultry, cheese, fish, and items packed in metallized films, the detector faces more challenges. The moisture in these products creates a signal that the detector must cancel out before it can detect metal. Using advanced technology with multiple frequencies and signal suppression algorithms helps reduce this interference, allowing the detector to find smaller metal contaminants.

Metal detection systems find three main metal types:

1. Ferrous metals (iron) are the easiest to detect because they are magnetic and conduct electricity well.
2. Non-ferrous metals (brass, copper, aluminum, lead) are non-magnetic but good conductors.
3. Stainless steel (both magnetic and non-magnetic types) can be difficult; especially non-magnetic grades like 316 and 304 that conduct poorly.

Only metal detectors using alternating current balanced coil systems can detect small particles of non-ferrous and non-magnetic stainless steel.

METTLER TOLEDO Safeline metal detection systems can detect all three types with high sensitivity using advanced signal processing to detect the most challenging metal contaminants.

Choosing a metal detector from a trusted equipment manufacturer can directly impact the reliability, safety, and compliance of your production. Reliable manufacturers invest in advanced technology and precise engineering for systems that detect even the smallest metal contaminants without slowing down production. Unlike with dynamic checkweighers, metal detector performance cannot be checked against a known standard. This means it is not possible for metal detectors to be "calibrated". Instead, metal detection sensitivity performance is "verified" using certified test samples.

Reputable manufacturers often offer extensive service packages that include expert installation, operator training, preventative maintenance, routine metal detection verification, and adherence to established metal detection verification procedures. Proper verification and regular metal detector validation are critical to keeping the system performing the specification and in compliance with industry standards.

METTLER TOLEDO Safeline offers full metal detection support, including installation, verification, maintenance, repairs, and operator training. Partnering with a trusted supplier reduces recall risks and helps keep your metal detection program effective and consistent.

METTLER TOLEDO Safeline metal detectors stand out due to their very high sensitivity, ease of use, and intelligent software that adapts to changing production needs. Key benefits of Safeline metal detection systems include:

1. Detection Performance
   • Proprietary Technologies: Advanced signal processing methods reliably identify and isolate metal contaminants.
   • Product Effect Neutralization: Compensate for the electrical properties of conductive products, reducing false rejects.
   • Multiple Metal Types: Detect ferrous, non-ferrous, and non-magnetic stainless steel.
     
     
2. Operation and Efficiency
   • User-friendly Machines: We offer systems with full-color touch screens and simple setup and operation in multiple user-customizable languages to reduce operator errors and minimize training time.
   • Multiple Product Profiles: Store multiple product profiles to allow for fast changeovers, maximizing production uptime.
     
     
3. Compliance and Data Integration
   • Inspection Data Recording: Comprehensive data logs support full traceability for audit purposes.
   • Factory Management System Connection: This easy integration enables centralized control and data review, making it easier to meet compliance requirements.
   • Data Management Systems: metal detectors are designed to seamlessly integrate with data management systems, allowing for efficient tracking, reporting, and analysis of inspection results for traceability and support with continuous improvement initiatives.

OEE measures production efficiency based on availability, performance, and quality. Unsuitable equipment can negatively impact OEE by causing downtime due to system failure, repeated false rejects, or excessive time spent on mandatory performance monitoring routine (PMR) testing.

Modern metal detectors, such as METTLER TOLEDO Safeline metal detection systems, help to improve OEE by:

• Increased Availability: Reliable construction design, enhanced Noise Immunity, and Condition Monitoring reduce metal detector downtime.
• Improved Performance: Predictive analytics and enhanced Performance Monitoring routines reduce test frequency and save time.
• Increased Quality: Accurate auto set-up and advanced frequencies, such as Multi-Simultaneous Frequencies, help to virtually eliminate false rejects and maximize sensitivity.

METTLER TOLEDO Safeline metal detection systems help deliver improvements to OEE by optimizing the inspection process and efficiency.

TCO measures the full cost of ownership over the equipment's service life (often 10+ years). The TCO calculation looks beyond the initial cost of equipment. It includes:

Direct Costs:

• Purchase price and energy use
• Wear parts, service contracts, and user training
• Labor for testing and operation

Indirect Costs:

• Downtime from failures or incorrect system settings
• False reject costs
• Production downtime during testing or product changeovers

Choosing a reliable, efficient machine is vital to reduce the total cost of ownership. Safeline metal detection systems are engineered to minimize maintenance and false rejects, maximizing your return on investment (ROI).

HACCP (Hazard Analysis and Critical Control Points) is a structured, risk‑based framework within which a metal detection program is designed to identify, evaluate and control metal contamination hazards throughout the production process. HACCP principles help identify Critical Control Points (CCPs) where metal detection is crucial, setting control limits for metal detection sensitivity, and establishing ongoing monitoring and verification protocols. This approach not only supports compliance with food safety regulations but also facilitates metal detection validation.

Metal detection validation provides documented proof that the system is operating correctly and can reliably detect and reject a product containing metal test pieces. This helps to confirm the equipment is functioning correctly and as intended.

An effective HACCP metal detection program protects the safety of food by systematically identifying and controlling metal contamination risks, protecting food quality and consumer health.