SICK GTB6 and GTB6L photoelectric proximity sensors with background suppression. The sensor ignores anything past the set distance, so a dark part in front of a bright machine frame is still detected reliably. GTB6 uses a PinPoint red LED with a 35 to 140 mm range; GTB6L uses a class 1 red laser with a 0.4 mm light spot for very small parts.
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