Construction:
loops are vulcanized into the belt's top or bottom cover, combine with external transmitters and receivers. 
Application
The most popular passive belt protection system for ST cord belt.
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 as the receiver sensor does not get a signal and shuts off the conveyor drive.
Different sensor loop styles we can offer: 
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