You can use a venturi tube, where it closes down the hose diameter a bit.  A
port in the narrow part of the tube will have a lower pressure than a port
on a larger width of the tube.  (increased fluid velocity -> lower fluid
pressure)  A simple differential pressure switch would be a transducer.

Ethan Swint
Ethan_Swint@baylor.edu

----- Original Message -----
From: "Patrik Husfloen" <u58611234@TELIA.COM>
To: <PICLIST@MITVMA.MIT.EDU>
Sent: Tuesday, May 08, 2001 12:04 PM
Subject: Re: [EE]: detect waterflow


> Yes, the tube would be filled at all times and I would only want to
monitor the actual flow.
> Impeller is one way to go although I'm looking for something more simple
:)
>
> Thanks.
>
> Patrik
>
>
> ----- Original Message -----
> From: "Shawn Yates" <syates@CARETECHNOLOGIES.COM>
> To: <PICLIST@MITVMA.MIT.EDU>
> Sent: Tuesday, May 08, 2001 6:49 PM
> Subject: Re: [EE]: detect waterflow
>
>
> > Fire alarm compananies detect when water flows through the sprinkler
system
> > and set off an alarm.
> >
> > If the tube starts empty, just an air gap switch that will be shorted
when
> > covered with water would work, unless you are trying to detect FLOW not
just
> > the presence of water.
> >
> > How about a small impeller and and monitor the shaft for rotation.  Then
you
> > could get realy fancy and measure the speed of the flow.
> >
> >
> >
> > Just some thoughts.
> >
> > Shawn
> >
> > -----Original Message-----
> > From: Patrik Husfloen [mailto:u58611234@TELIA.COM]
> > Sent: Tuesday, May 08, 2001 12:21 PM
> > To: PICLIST@MITVMA.MIT.EDU
> > Subject: [EE]: detect waterflow
> >
> >
> > Are there any clever ways to detect waterflow in a hose/tube?
> >
> >
> > /Patrik
> >
> > --
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