Leuze hrtr 46b standard diffuse reflection light sensor background suppression leuze electronic 50107229 this standard diffuse reflection light sensor uses the visible red light from an led as its light source which together with b i brightvision i b makes it easy to set up and align the sensor features adjustable background suppression and a sup2 ls active ambient light suppression increasing accuracy and repeatability the adjustable scanning range can be set precisely using an