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Originally Posted by de_
No, I'm 99% certain they were yellow. They were not directly attached to any rotating part. I am sure they were using reflected light. If I remember properly, Busy Bee used them aimed against black and white disks attached to their wheels. I believe they could be installed at least 0.5" or more away from the wheel.
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From the description, they're probably Banner proximity sensors. Try doing a search on
QS18VN6LV, the part number.
-Kevin