The E.R. and E.R.E.N. models are the star product of the range of manufacture due to their great resolution and simple installation process.
It consists of a single detector coil designed to be placed under the conveyor belt.
When a metallic body passes combined with the stone, a signal appears in the detector; once it is amplified, it is transmitted to the handling box which acts by stopping the conveyor belt and the feeder, activating at the same time, the acoustic and visual alarm showing detection.