Maybe there are solutions to this other than measuring the liquid *AFTER* it
enters.

Could you use a free wheeling positive displacement pump connected to a
rotary encoder on the (lower) input as a measuring tool - it should tell you
*EXACTLY* how much liquid passes *IN* or *OUT*.

Just a *NEW* thought.

Bye.


> -----Original Message-----
> From: Andy Shaw [SMTP:andys@SCO.COM]
> Sent: Tuesday, 17 October 2000 3:46
> To:   PICLIST@MITVMA.MIT.EDU
> Subject:      Re: [EE]: Help water level
>
> Thanks Adam,
> any advice on which float system to use and where I can get hold of one in
> the UK?
>
> Andy
>
> ----- Original Message -----
> From: "M. Adam Davis" <adavis@ubasics.com>
> To: <PICLIST@mitvma.mit.edu>
> Sent: Monday, October 16, 2000 3:42 PM
> Subject: Re: [EE]: Help water level
>
>
> > Given that it is for a sub, the water shouldn't slosh around all that
> much.  Why
> > not use a float?  It is probably a little larger than you want, and
> perhaps
> > you'd rather have a non-mechanical sensor, but for ease of assembly and
> reading
> > and simple float setup with a pot or rotary encoder can't be beat.
> >
> > When you do go to another expiremental method, it would be benificial to
> have
> > the float working as well so you can compare the readings and improve
> your
> > design, before getting rid of the float.
> >
> > -Adam
> >
> > Andy Shaw wrote:
> > >
> > > Hi Folks,
> > > I'm trying to put together some sort of sensor to measure the amount
> of
> > > water in a model sub ballast tank. The requirements are:
> > > 1. Must be small (not a lot of space).
> > > 2. Easy to seal against water.
> > > 3. Continuous range from say 1 cm to say 30 cm deep, with 1mm
> accuracy.
> > > 4. Possibly best not to use anything that depends upon pressure (since
> this
> > > may vary depending upon sub depth).
> > > 5. Easy to hook up to a PIC (either digital or analogue OK  - I have
> both).
> > > 6. Cheap!
> > > Not asking much!
> > >
> > > I seem to remember seeing a rain gauge project that used two
> (insulated)
> > > wires separated by a fixed gap as part pf some sort of oscillator. But
> guess
> > > what I've lost the mag. Anyone got the details of know if this would
> work
> > > for me?
> > >
> > > Thanks
> > >
> > > Andy
> > >
> > > --
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> >
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> >
> >
> >
>
> --
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>
>
>

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