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Safety light curtains XU - Manufacture date of the XUSL4E or XUSL2E light curtains

The manufacture date of the XUSL4E or XUSL2E light curtains is a part of the serial number. The serial number is composed of the manufacture date and a progression number. Example in the attached picture showing the XUSL4E3BB081N transmitter and receiver serial number indicated on the labels : 14030740 where 14 is the production year (Y=2014), 03 is the week of the year (W=03) and 0740 is a progression number