Actually what I meant (based on what I remember from vague flashbacks of=20
high-school-level physics classes) is that the pressure is equal to the a=
ir=20
pressure on top of the beer + the pressure due to the weight of beer of a=
=20
certain height.

Then I realized that the variation due to ambient pressure changes may no=
t be=20
worth the effort of using 2 sensors.

And yet now, I'll adjust that to state that if using a "gage"-type sensor=
=20
(which already has an output relative to ambient pressure), then only one=
=20
sensor is required.

Sorry for the changes, but I'm brainstorming this as I go along.

Cheers,
-Neil.



On Tuesday 29 July 2003 15:53, Olin Lathrop scribbled:
> > Is the beer pressurised (carbonated?) if so, it may screw up any
> > pressure based sensing methods.
>
> Ah, maybe that's what Neil meant.  Yes, in that case you would need two
> pressure sensors, one at top to and one at bottom.  The difference
> indicates the height of the beer in the tank.
>
>
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