a friend of mine is working on this:
http://www.wizdforums.co.uk/showthre...ight=flowmeter
The paddle design is available in 1/2" and 1/4" barbed units. He's working on the support electronics (nothing complex) and a board to handle 4 meters at a time. while it doesn't have the fancy-fancy calibration of the swissflow (which if it was 20 euros each I'd be all over it - I need 4 or 5 of them and can't justify 250 euro for it!)
Anyway , check out the specs on the swissflow SF800:
http://www.swissflow.com/html/800_5.htm
Quote:
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Originally Posted by Read the link!
liquid type*** : clear or translucent liquids capable
of transmitting IR light
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so no paddle or moving parts - all done optically. I wish I knew how the hell they did it.