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QL55 Series Luminescence Sensors


The QL55 Series Sensor is an easy-to-use, extremely sensitive microprocessor-based luminescence sensor that emits ultraviolet light from a high-power LED and scans for luminescence in materials. The QL55 senses the luminescence inherent in a material, or it can sense luminophores added to a material in process to make it luminescent.



  • Self-contained design in a robust, compact metal housing
  • High sensitivity
  • Microprocessor-controlled
  • Senses luminescent marks, even on luminescent backgrounds
  • Senses luminescence on reflective surfaces, such as ceramic, metal, or mirrored glass
  • Easy-to-set sensing threshold
  • Fast 250-microsecond sensing response time; high 2 kHz switching frequency
  • Switch-selectable NPN or PNP discrete output, plus 0 to 5.5V dc analog output
  • Switch-selectable output OFF-delay
  • 3-position swivel QD connector