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Choose a label sensor by defining the real optical object detection task before comparing product families. Record the target or measured object, operating range, motion, mounting geometry, environment, controller interface, and acceptance test. Use the worst permitted condition rather than the easiest sample, and verify every numerical limit against the current data sheet for the exact model. A category description can identify a technology direction, but it cannot prove model-level distance, response, accuracy, ingress protection, temperature limits, wiring, or certification.
The primary task is label sensor selection by label liner gap and web speed. This article treats that phrase as one engineering decision, not as a claim that every product in a category fits the application. The boundary includes the actual target or measured object, minimum and maximum operating condition, installation geometry, control interface, environment, consequence of failure, and evidence required for approval.
A label sensor must be tested with the darkest, lightest, glossiest, clearest, smallest, and fastest permitted target states. Background, ambient light, contamination, and alignment can change optical margin. Test backing web, adhesive, gap, label edge, transparency, foil, print, overlap, web flutter, speed, and teach drift with production rolls from each approved material source.
