|
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. |
 |
|
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. |
