Path: utzoo!censor!geac!torsqnt!news-server.csri.toronto.edu!cs.utexas.edu!samsung!dali.cs.montana.edu!milton!ogicse!zephyr.ens.tek.com!videovax!bill
From: bill@videovax.tv.tek.com (William K. McFadden)
Newsgroups: sci.electronics
Subject: Re: Cheap water flow sensor?
Message-ID: <6229@videovax.tv.tek.com>
Date: 18 Dec 90 21:01:17 GMT
References: <4390@alliant.Alliant.COM>
Reply-To: bill@videovax.tv.tek.com (William K. McFadden)
Distribution: na
Organization: Tektronix TV Measurement Systems, Beaverton OR
Lines: 13

In article <4390@alliant.Alliant.COM> holbrook@alliant.alliant.com (Mark Holbrook) writes:
>I need a device to give me an binary electrical indication that water
>is flowing/not flowing through a standard half-inch domestic water
>pipe.  

This is only a partial solution, but you can detect the turn-on of
hot water by the temperature rise on the pipe.  You can detect the
flow rate with two sensors.  This only works at startup, though.
-- 
Bill McFadden    Tektronix, Inc.  P.O. Box 500  MS 58-639  Beaverton, OR  97077
bill@videovax.tv.tek.com,     {hplabs,uw-beaver,decvax}!tektronix!videovax!bill
Phone: (503) 627-6920       "The biggest difference between developing a missle
component and a toy is the 'cost constraint.'" -- John Anderson, Engineer, TI