Product Description
**IP65 / IP69K Rated Wash-Down Inline Metal Detector for Frozen Food | Reliable, Hygienic Protection in Extreme Environments**
Ensure uncompromising food safety and equipment reliability in the demanding world of frozen food processing with our industrial-grade Wash-Down Inline Metal Detector. Specifically engineered to withstand the harsh conditions of sub-zero temperatures, high-pressure cleaning, and persistent moisture, this system provides a robust and sanitary Critical Control Point (CCP) for your production line. It reliably detects ferrous, non-ferrous, and stainless steel contaminants in frozen vegetables, fruits, seafood, ready meals, and meat products, protecting both your consumers and your brand.
**Engineered for the Harsh Realities of Frozen Food Production**
Frozen food lines present unique challenges: ice crystals cause product effect variation, condensation can lead to moisture ingress, and rigorous sanitation protocols require daily high-pressure, high-temperature wash-downs. Standard metal detectors fail in these conditions. Our detector is built from the ground up to thrive here.
**Unmatched Durability and Hygiene with IP69K Protection**
The cornerstone of our design is its exceptional ingress protection rating:
* **IP69K Certification:** Guarantees complete protection against dust (IP6X) and sustained, close-range, high-pressure, high-temperature water jets from any direction. This is the highest standard for equipment in direct wash-down zones.
* **Full Stainless-Steel Construction (316L):** All product-contact and exterior surfaces are made of corrosion-resistant, food-grade stainless steel. The housing is fully welded and sealed, with smooth, crevice-free surfaces to prevent bacterial harborage and facilitate rapid, effective cleaning.
* **Sealed Electronics & Connectors:** All electrical components are housed in a sealed, pressurized (if specified) enclosure with IP65/IP66 rating, protecting sensitive circuitry from humidity, condensation, and chemical cleaning agents.
**Advanced Detection Technology for Frozen Products**
Overcoming the "product effect" of frozen items is critical. Our system delivers stable, high-sensitivity performance:
* **Multi-Frequency Operation & Advanced DSP:** Selectable or automatic frequency optimization allows the detector to be tuned for different frozen products (e.g., icy peas vs. dense fish fillets), minimizing false rejects while maintaining excellent sensitivity to all metal types.
* **Automatic Product Learning:** A one-touch "Learn" function quickly establishes a baseline signal for each product, automatically compensating for natural variations in temperature and product composition.
* **Heated Aperture Option:** Available to prevent the buildup of ice and condensation on the inside of the detection aperture, ensuring consistent performance and eliminating a maintenance headache.
**Designed for Seamless, Sanitary Integration**
* **True Inline Design:** Installs directly onto existing conveyor systems for frozen products, including flat belts, mesh belts, or vibratory conveyors.
* **Sanitary Rejection System:** Integrates with USDA/FDA-accepted rejection devices such as pneumatic pushers or air blasts, ensuring contaminated product is removed without compromising the hygienic zone.
* **User-Friendly, Sealed HMI:** Features a waterproof touchscreen interface with a sealed membrane for easy operation and monitoring while withstanding wash-downs.
**Key Applications in Frozen Food Processing**
* **Frozen Vegetables & Fruits:** Peas, corn, berries, diced potatoes, mixed blends.
* **Frozen Seafood:** Fish fillets, shrimp, scallops, crab meat.
* **Frozen Ready Meals & Prepared Foods:** Pasta dishes, pizzas, meats with sauces.
* **Frozen Poultry & Meat Products:** Chicken nuggets, beef patties, meatballs.
* **Frozen Bakery & Desserts.**
**Delivering Core Business Value**
1. **Withstands Brutal Sanitation:** Built to survive daily aggressive wash-downs, reducing downtime and maintenance costs.
2. **Maintains Sensitivity in Cold, Wet Conditions:** Provides reliable, stable detection where other detectors falter, ensuring your CCP is always in control.
3. **Prevents Costly Contamination Events:** Protects against consumer harm, brand-damaging recalls, and damage to downstream equipment like dicers and grinders.
4. **Simplifies Compliance & Audits:** The robust construction and automatic data logging provide clear evidence of a validated, well-maintained CCP for **BRCGS, SQF, FDA, and other global standards**.
**Technical Specifications**
* **Protection Rating:** IP69K Housing / IP66 Control Cabinet (typical).
* **Construction:** 316L Stainless Steel, polished welds.
* **Detection Sensitivity:** High performance for Fe, Non-Fe, and SS. Validated per application.
* **Conveyor Compatibility:** Customizable for various belt types and widths.
* **Communication:** Data logging, Ethernet, USB, and standard I/O for PLC integration.
**Prove It in Your Environment. Request a Trial.**
We understand your challenges are unique. Contact us to discuss a pilot program or to receive a detailed application review. Ensure your frozen food line is protected by the most durable detector on the market.
**Keywords:** IP69K Metal Detector, Wash-Down Metal Detector, Frozen Food Inspection, Inline Metal Detection, Hygienic Metal Detector, Stainless Steel Metal Detector, HACCP CCP for Frozen Food, BRCGS Compliance, Food Safety Equipment, Sanitary Design, China Manufacturer, Industrial Detector Supplier.
Metal contamination is a critical concern across a broad range of industries-from food processing and pharmaceuticals to textiles, plastics, mining, and wood production. To mitigate contamination risks, protect brand integrity, and ensure regulatory compliance, manufacturers rely on robust, adaptable detection solutions. Among the most versatile of these is the Tunnel Aperture Metal Detector Head.
Designed to deliver high-sensitivity detection of ferrous, non-ferrous, and stainless-steel contaminants, the Tunnel Aperture Metal Detector Head is engineered for universal industry applications. It offers flexible installation, seamless integration with conveyors or drop-through systems, and reliable operation even in challenging environments.
This product introduction covers its functionality, technical capabilities, configurations, industry applications, and return on investment, making it a go-to solution for contamination control in diversified industrial processes.
3. Technical Specifications
| Feature |
Specification |
| Aperture Sizes |
Width: 100-1500 mm; Height: 50-800 mm |
| Detection Types |
Fe, Non-Fe, SUS |
| Sensitivity Range |
Fe ≥ 0.3mm; SUS ≥ 0.5mm (depends on product) |
| Frequency Range |
50 kHz-900 kHz |
| Operation Modes |
Dry / Wet / Auto-learn |
| Display Interface |
7" or 10" Color Touchscreen |
| Memory Capacity |
Up to 200 product profiles |
| Alarm Output |
Visual, audible, and digital (relay) |
| Protection Grade |
IP65 / IP66 / IP69K (for food models) |
| Power Supply |
AC 110-240V, 50/60Hz |
| Compliance Standards |
CE, ISO9001, HACCP, BRC, FDA, IFS |
4. Applications by Industry
The Tunnel Aperture Metal Detector Head is suited for diverse industries due to its modularity and sensitivity:
4.1 Food Industry
4.2 Pharmaceuticals
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Detects small metal shards in tablets, capsules, or powdered supplements
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Often integrated before bottling or packing lines
4.3 Plastics & Rubber
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Used to detect tramp metal in plastic pellets, flakes, or raw materials
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Prevents damage to molding equipment and ensures final product quality
4.4 Textiles & Garments
4.5 Mining & Aggregates
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Installed on conveyors to prevent crusher damage from embedded metal
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Withstands high-dust, high-load environments
4.6 Wood and Pulp
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Detects nails, staples, and embedded hardware in lumber
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Helps protect saw blades and improve pulp quality
4.7 Recycling
5. Integration Options
The metal detector head can be installed:
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Over conveyor belts
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Inside vertical drop chutes
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On horizontal packaging lines
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Before filling/sealing machines
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Inline with metal reject systems
Available Accessories:
6. Compliance and Safety Standards
The tunnel aperture metal detector complies with:
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HACCP (Hazard Analysis Critical Control Point)
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BRC (British Retail Consortium)
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IFS (International Featured Standards)
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FDA & USDA (for food-grade models)
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CE certification for electrical safety and EMC
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Optional OIML legal metrology compliance
7. Key Benefits
1. Universal Application
2. Customization Flexibility
3. High Accuracy
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Detects small, hard-to-find stainless steel particles
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Minimizes false rejects with product effect compensation
4. Reduced Downtime
5. Long-Term ROI
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Protects downstream machinery
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Prevents product recalls and reputation damage
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Meets buyer and retailer food safety standards
8. Case Studies
Bakery Processing Line - Germany
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Needed metal detection for 10+ SKU formats on a high-speed line
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Chose a tunnel head integrated with existing belt and pusher system
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Result: Detected 0.4mm steel flakes from worn mixers; passed IFS audit
Plastic Pellet Manufacturer - USA
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Metal bits from raw bulk shipments were damaging extruder screws
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Tunnel head installed before hopper intake
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Reduced downtime by 35%, saving $25,000/year in equipment repairs
Garment Exporter - Bangladesh
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Installed tunnel detector for post-sewing inspection
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Detected broken needles in 1 out of every 5,000 units
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Helped secure compliance with European brand partners
9. Maintenance and Support
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Self-checking function with every startup
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Auto-calibration for each new product profile
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Minimal consumables or moving parts
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Available service contracts for:
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Remote diagnostic support via Ethernet
10. Return on Investment
Estimated ROI: 6-12 months
Why?
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Prevents expensive recalls
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Avoids machine damage
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Meets regulatory inspections
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Improves production confidence
A single recall or equipment failure could cost tens of thousands in downtime and liability-this system pays for itself quickly.
Conclusion
The Tunnel Aperture Metal Detector Head is the ideal contamination control solution for companies across universal industries. Its compact, modular design, advanced signal processing, and broad compatibility make it an indispensable tool for inline quality control.
Whether you're operating in food, pharma, recycling, textiles, or mining, this metal detector head delivers consistent performance, protects your products, and helps your operation stay compliant with global safety standards.
Request a Quote or Technical Drawing
Looking to install a tunnel detector head into your line?
Contact us for custom aperture sizing
Receive a 2D/3D CAD drawing
Schedule an on-site or virtual demo
Ask about global shipping and OEM integration
1. Introduction
A conveyor metal detector is a crucial device across diverse industries, safeguarding product quality and consumer safety. It's engineered to spot metallic contaminants within items transported on conveyor belts, preventing potential harm from metal fragments and shielding machinery.
2. Working Principle
This detector functions on electromagnetic induction. A transmitter coil generates a magnetic field above the conveyor. When a metal object passes through, it disturbs the field. The receiver coil detects this disruption and relays an electrical signal to the control unit. Advanced models use algorithms to filter false positives from vibrations or electrical interference, ensuring precision.
3. Types of Conveyor Metal Detectors
3.1. Balanced Coil Metal Detectors
The most prevalent type, featuring precisely balanced coils. Their electrical equilibrium is disrupted when metal enters the zone, triggering an alarm. Renowned for high sensitivity and stability, they're ideal for food and pharmaceutical sectors where minute contaminants matter.
3.2. Pulse Induction Metal Detectors
These emit short, powerful magnetic pulses. Metal objects induce eddy currents, generating a secondary magnetic field that's detected. Great for spotting larger, deeply buried metals, they're common in mining and recycling to handle bulk materials with potential big metal pieces.
3.3. Multi-frequency Metal Detectors
Operating at multiple frequencies, they adapt to different product traits. In food production, where products vary in moisture and density, they optimize detection by adjusting frequencies, cutting false alarms.
4. Key Components
4.1. Conveyor Belt
Made of non-metallic materials like polyurethane, it must be properly sized and speed-set for the application. A food packaging line might need a wide, fast belt for high volume while ensuring inspection quality.
4.2. Detection Head
Housing transmitter and receiver coils, it creates a uniform magnetic field. Its dimensions vary with product size; sometimes multiple heads are used for comprehensive detection.
4.3. Control Panel
The operator's interface, showing detection results and settings. Modern ones are touchscreen, with data logging for quality control and traceability.
4.4. Reject Mechanism
When metal's detected, mechanisms like pneumatic pushers or flap diverters remove the item. The choice depends on product attributes and conveyor layout.
5. Applications
5.1. Food Industry
Essential from ingredient to packaging stages, it stops metal from processing equipment getting into food. In canned goods or bakery items, it ensures safety and quality.
5.2. Pharmaceutical Industry
Must-have for drug manufacturing to screen tablets, capsules, etc. Tiny metal specks in injectables can endanger patients, so detectors maintain sterility.
5.3. Packaging Industry
Prevents metal objects from being packaged with consumer goods. In electronics assembly, it avoids mispacked screws, reducing returns.
5.4. Recycling Industry
Separates metals from waste on conveyor belts, enhancing recycling efficiency and aiding environmental conservation.
6. Factors Affecting Detection Performance
6.1. Product Characteristics
Moisture, salt content, size, and shape of products can interfere with detection. High-moisture fruits or salty pickles might cause false alarms or misses.
6.2. Conveyor Belt Speed
Faster belts reduce product exposure time, risking missed detections. But slowing down too much hampers production flow; a balance is key.
6.3. Environmental Interference
Nearby machinery or power lines can disrupt the detector. Shielding and vibration-damping measures combat electromagnetic interference and vibrations.
6.4. Metal Type and Size
Ferrous metals are easier to detect than non-ferrous or some stainless steel grades. Smaller objects are harder to spot and demand higher sensitivity.
7. Installation and Calibration
7.1. Installation
Place the detector stably, level the platform, and install the conveyor belt smoothly. Position the detection head correctly and allow clearance for maintenance.
7.2. Calibration
Regularly calibrate using known metal samples to set sensitivity levels. Some advanced models have automatic calibration for operator ease.
8. Maintenance and Troubleshooting
8.1. Maintenance
Clean the belt, inspect the detection head and electrical connections, and lubricate moving parts to prolong the detector's life.
8.2. Troubleshooting
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