Two photoelectric sensors in one housing that combine logic evaluation intelligently with one another, Sick’s MultiLine sensor is designed for high-end difficult applications detecting flat or textured objects.
The special characteristic of the MultiLine sensor is the two parallel light lines, i.e. the compact W4 housing accommodates not one but two photoelectric sensors operating simultaneously. The ‘two eyes’ detect better, particularly when objects, such as printed circuit boards that have gaps or openings or if – as in the case of blister packs or soup packets – that are exceedingly flat overall, but do have some curved or transparent surface areas.
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 there. 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.
The MultiLine sensor overcomes these problems. When an item moves into the scanning range of the sensor, 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, e.g. in a gap of the printed circuit board or through deflection on the surface of the package, the other line maintains the signal. In this way, critically structured objects remain visible to the sensor and the machine control at all times, eliminating false switching.
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