Sick MultiLine optical sensor

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The special characteristic of the Sick MultiLine sensor is the two parallel light lines — the compact W4 housing accommodates two photoelectric sensors operating simultaneously. The sensor is therefore suitable for detecting objects such as printed circuit boards that have gaps or openings, as well as exceedingly flat objects such as blister packs or soup packets.

With respect to objects with gaps, using conventional photoelectric sensors involves the risk that the light and thus the reflection to the sensor may disappear through a gap. The consequence is that the sensor switches off, even though the object is still present. A similar phenomenon can be observed in the case of flat objects with reflective, curved and transparent areas. Here, too, the light may disappear for a short time and switch off the photoelectric sensor.

With the MultiLine sensor, when an item moves into the scanning range, it switches on if the two lines have detected the object. The signal will be active until both light lines no longer signal an object. If, in the meantime, one of the light lines goes missing, the other line maintains the signal.