> > So I'm currently looking at using
> > the pressure in the sealed tank as an indication of the amount of water
> > taken on.
>
> That means you will really be measuring the volume of air in the tank
times
> the temperature.

Oops, I meant to say you will be measuring the MASS of air in the tank times
the temperature.  The volume is presumably held constant by the tank.

The overall point still is that you will need to temperature compensate the
pressure reading to get the accuracies you stated earlier.  Water
temperature can change quite a bit in just a meter or two of depth, and
sometimes just a few meters lateral distance.  I don't have any submarine
experience, but this comes from swimming, snorkeling, and the like.


*****************************************************************
Olin Lathrop, embedded systems consultant in Devens Massachusetts
(978) 772-3129, olin@cognivis.com, http://www.cognivis.com

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