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>Posted on 1 Nov 1995 at 18:46:47 by AHDNN1A.DDRAKE01@ed*.co*
>Gas flow meters (was gas blending)
>
>   ....... why not use gas flow meters on
>your lines.

The problem as I see it is that your fill now depends on a number
of parameters: the tank volume must be known, the density of the
gas must be fixed (fixed pressure and temperature), the flowrate
must be monitored at all times and time becomes a factor.
What's the uncertainty in all this ? I don't know.

Compare this to using pressure: For a given temperature
a measurement of the pressure tells you the density of the
gas to the same accuracy as you pressure gauge.  Details
regarding the fill: rate, temperature, chilling bath etc
are irrelevant (as is the exact volume of the pressure vessel
into which we add these gases).

john

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