Detecting target marks that contrast with their background has always
posed a problem for machine builders. Now, Omron claims to have come up
with a solution in its new E3MV contrast sensor, which will reliably
detect a mark as long as it is discernible against the background. In
addition, the new sensor responds at high speed. A 30ms switching time
enables the device to detect contrasting marks in high-speed positioning
applications such as may be found in packaging and labelling machines. In
integral threshold adjustment also allows the user to set the pass/fail
limits of the target. This not only offers a more sophisticated and
reliable response than a simple presence output, but also provides
production managers with a long term monitor of the quality of the
target, which may help to identify production problems. Target
recognition and threshold are set locally via a single pushbutton, or
remotely via a suitable interface such as a computer or HMI.
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