> Is it as simple as it seems....4-20mA current loops....put across
> a precision resistor and then feed to the A/D ? Or better....buffered
> thru a unity gain amp...?

I'm getting good results with an F88, a 4-20mA depth sensor
and this

http://www.maxim-ic.com/appnotes.cfm/appnote_number/823

Basically doing what you said. No adjustment or fiddling necessary
to get 1mV / mm over 5m (apart from grounding pin 1 of the 472,
which isn't shown above)

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