Datalogic offersmanufactures miniature fibre optic sensors, ten series., a a specially developed anti-interference function allows these new sensors to be used in close proximity to each other. However, unlike conventional phase lock anti-interference systems, there is no trade off in switching speeds. Control for the programming comes from a microprocessor while an led provides operator feed back for correct operation and fibre alignment. The pproximity and through beam performance are both excellentsuperb.