Luminescence sensors are applied where adhesives, sealing compounds, special liquids, or other materials are combined with fluorescent substances. When illuminated with UV-light, these fluorescent additives will light up and emit light in the visible spectrum (e.g. red, orange, yellow, green, blue). In the LUMI Series sensors, modulated UV light is employed to suppress outside light sensitivity. The special optical arrangement of optical emitter and receiver (radial or linear emitter) allows operating distances of up to 100 mm. The sensors are equipped with an RS232 interface, the Windows® software is included in the delivery.