be sure the + 24 vdc is applied with the correct polarity be sure that the unit is powered with at least + 20 vdc under loadclean UV and IR window and associated source light rods. cover IR portion of FL 3100 for ten seconds to determine if there is background IR. if there is, remove IR radiation source or change FL3100 location. if there is no background IR, replace IR detector in FL3100.
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