Comprising light scanners, through beam photoelectric sensors, and retro-reflective photoelectric sensors, SR 49C Series is suited for detection tasks at operating ranges up to 120 m and in supply voltage range from 20–250 Vac/Vdc. IP67 protection, in combination with integrated heating, makes outdoor use possible, even in transition areas where condensation can occur. Sensors offer functions for response or switch-off delay, automatic sensitivity readjustment, and reversible switching.