Leuze electronic lsr46b throughbeam photoelectric sensors tx amp rx align ind leuze electronic 50108526 throughbeam photoelectric sensor transmitter that features a long operational range as well as brightvision and alignment indicator for fast precise alignment light source is a visible red led when used with the matching receiver 64 3791 transmitter and receiver form a light axis that is suitable for a wide range of applications leuze electronic 50108526 lssr 46b s12 throughbeam