Retro-Reflex Sensors

Retro-​reflex sen­sors for rol­ler conveyors work ac­cor­ding to the through-​beam mode. Light is sent to a re­flec­tor moun­ted op­po­site the sen­sor that is then re­flec­ted back. If the light beam is in­ter­rup­ted by the ob­ject on the conveyor, the sen­sor is swit­ched. The use of red light en­ables even shiny and black ob­jects to be de­tec­ted.