/members-area/personalblogs/b/blog/posts/what-s-the-difference-between-diffuse-reflective-and-retro-reflective-photoelectric-sensorsPhotoelectric sensors consist of an emitter and receiver, the emitter sends out a beam of light for the receiver to sense. With the diffused and retro reflective type of sensors both the emitter and receiver are placed in the same housing and a...en-USTelligent Community 12