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Re: Optical sensor for use with retroflective tape
Last year we used the banner sensors because we had a bunch on hand, but we had also done some testing with a sensor used to detect paper in a copy machine. It was only $10, but we accidentally ordered the wrong one which wasn't rated for the speed we were using it at. When we got to 4k RPM, it melted and almost caught fire. Before we hit the max switching frequency it worked quite well, so if you can find one rated for a higher speed, I would recommend one.
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