Rip detection
The most popular passive belt protection system are induction loops/coils in combination with external transmitters and receivers.
The loops are vulcanized into the belt's top or bottom cover.
If a foreign body penetrates the belt and gets stuck in the conveyor structure, it may rip the belt.
If a sensor loop is cut by this foreign body, no signal is transferred by the loop anymore - the receiver sensor does not get a signal and shuts off the conveyor drive.
Loop sensor
Rip detection diagramRip detection process
There are different sensor loop styles on the market:
The most reliable design is of a rectangular shape.
Other loops have got one or more points where the cords or wires cross. At these points the wires rub and may break.

In general, sensor loops are sensitive parts, which may trigger off false alarm. Also if high grade iron ore like magnetite, with very strong ferromagnetic properties, is being conveyed, the rip detection system may not work properly.

Sensor loops do not achieve the operational lifetime of the conveyor belt.


The distance between two loops (the pitch) is usually determined by multiplying the belt speed by the time to stop the belt, divided by 2. The result will probably be between 50 to 200 m.


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