The PULNiX intelligent ¨TWIN¨ photoelectric beam is designed to meet the highest standards of quality and reliability for photoelectric beam intrusion detection. Unique twin beams are synchronized to work together to reinforce the range and stability in severe weather conditions. The ¨intelligence¨ comes from having 4 different selectable frequencies which allow the stacking of beam sets to create a ¨Wall of light¨. The system has a rotary optical system lens design aids in proper alignment.