AVR-Chat

On Wed, May 13, 2009 at 09:47:39AM -0700, Bruce Parham wrote:
> Sorry, my earlier response was incomplete, just the germ of an idea.
> 
> Since the inverted standpipe is initially filled with air, when the
> liquid level rises, the gas will be compressed allowing liquid to
> enter the tube which will reduce the pressure head. The actual
> pressure measured will depend on the total volume of the tube and the
> amount displace by liquid but will always be less than the pressure at
> the bottom of the tube.
> 
> -- The gas compression correction is left as an exercise for the
> student. --

All to avoid purchase of a sensor which won't be damaged by the liquid?

The compressed air in the inverted standpipe will eventually dissolve
into the liquid. This proposed solution will not work in a static
situation, must be cyclical allowing the air in the standpipe be
refreshed periodically.

-- 
David Kelly N4HHE, dkelly@HiWAAY.net
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Whom computers would destroy, they must first drive mad.