Conveyor Metal Detector

The TN77 Industrial Metal Detector is built to safeguard processing equipment by detecting and locating tramp iron and manganese steel hidden in conveyed materials. Typical contaminants include digger teeth, drill rods, and crusher liners that, if not removed, can cause severe damage to crushers, screens, and conveyors. By catching these hazards early, the TN77 helps prevent equipment breakdowns, unplanned downtime, and costly repairs.

Designed as a tunnel-type unit, the TN77 is easy to install on both new and existing conveyor systems. The split-frame coil makes it possible to fit the detector without cutting the belt, reducing installation time and disruption. Once in place, the TN77 provides continuous inspection of bulk materials such as sand, gravel, coal, limestone, and ores, ensuring reliable protection in high-throughput operations.

Operators value the TN77 for its straightforward controls, low maintenance requirements, and consistent performance in tough environments. Its weather-resistant construction makes it suitable for dusty processing plants as well as outdoor installations in quarries and mines. With adjustable sensitivity settings and the ability to detect multiple pieces of tramp metal simultaneously, the TN77 delivers dependable performance across a wide range of applications.

Reliable Tramp Metal Protection
Identifies damaging contaminants like digger teeth, drill rods, crusher plates, bars, chains, nuts, and bolts to avoid costly equipment failures.

Handles Manganese Steel & Ferrous Metals
Detects both typical ferrous tramp and harder-to-detect contaminants like manganese steel pieces.

Adjustable Detection Sensitivity & Dual‑Piece Detection
Fully adjustable detection level; capability indicates if one or two pieces of tramp metal are detected at once.

Ignores Non‑Magnetic Belt Components
For example, copper‑alloy belt fasteners are overlooked, reducing false alarms.

Customizable Coil/Aperture Sizing
Standard search coil sizes are available; custom apertures supplied to suit different belt widths and material profiles.

Tunnel Design & Retrofit‑Friendly
Can be fitted onto existing conveyors without needing to remove or cut the belt; coil can be dismantled for easier installation.

Control Options & Alarms
Features an IP rated control cabinet (often wall‑fixed, local or remote), with visual or audible alarms; supports interlocking belt stop or reject mechanisms.

Prevents Equipment Damage and Downtime
Stops tramp metal from entering crushers, screens, and conveyors, reducing wear, maintenance costs, and unexpected shutdowns.

Built for Demanding Environments
Weather-resistant and dust-tight construction ensures dependable performance in outdoor and heavy-duty processing conditions.

Low-Maintenance Operation
With no moving parts and rugged components, the TN77 delivers long-term protection with minimal service needs.

• Aggregate, mining, and quarry operations (rock, stone, sand, gravel) where tramp metal causes crusher, screen, or conveyor damage. 
  
  
• Recycling facilities where contaminated materials can damage processing or reduce product purity. 
  
  
• Bulk material handling operations involving coal, minerals, chemicals or wood chips, where metal contaminants reduce throughput or product quality.

• The TN77 consists of a search coil (tunnel‑type) that material passes through, and a control unit housed in an enclosure (commonly wall‑mounted, local or remotely located). 
  
  
• On detecting tramp metal, the coil sends a signal to the control unit, which processes it and triggers one or more control actions (stop belt, alarm, reject mechanism, or marking device). 
  
  
• Designed for continuous inspection of non‑metallic or non‑conductive load materials such as limestone, granite, sand & gravel, clay, coal, chemicals, wood chips, mineral ores etc.