# How do I choose?

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#### Michelle Smalley

I am constructing a (non-magnetic)levitation device...using an opto22 plc to control a dayton 2c646 dc blower to raise a ball in a tube...

I'd like to mount a (non contact) sensor at the top of the tube ('looking' straight down into the tube) to get a measurement of the ball's position...with a range of about 4-24".

I looked on globalspec.com, and they have alot of products, but I don't know what is best suited for this application.

I don't know jack about sensors, and could really use some help.

Thanks

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#### James Ingraham

Check out the Aromat KM1 series analog photoelectric eyes. The part number we use is AKM17115. Try