Re: [PSUBS-MAILIST] test of CO2 safety hardware - any volunteers?

[Warren Greenway <opensourcesub@yahoo.com>]

Hmmm. True. What about using a ring of smaller samples
that are opened/closed either at specific time 
intervals or when they change color? That way you 
could take multiple samples to increase the useability

of the system.

Warren.

--- NeophyteSG@aol.com wrote:
> 
> Had to sit with it for a while before venturing a
> comment.  The problem with 
> a color-change, pH-based indicator is that it's a
> cumulative indicator rather 
> than "snapshot" indicator.  The longer you bubble a
> CO2-containing mixture 
> through the solution the more acidic it becomes and
> the more pronounced the 
> color-change.  And, unfortunately, bubbling a
> non-CO2-containing mixture through 
> doesn't reverse the reaction.  So, what you're left
> with is an indication of how 
> much has passed through semi-volumetrically but not
> how much is *currently* 
> in the mixture.  You  may also encounter solubility
> limits depending on the 
> temperature and pressure.   
> 
> Don't get me wrong.  I'm not saying that it can't be
> done, merely that you'll 
> need to take this into consideration in whatever
> incarnation your design 
> takes.
> 
> Warm Regards
> Shawn
> 
> *****
> 
> "Call nothing thy own except thy soul.
> Love not what thou art, but only what thou may
> become.
> Do not pursue pleasure, for thou may have the
> misfortune to overtake it...
> Live in the vision of that one for whom great deeds
> are done ..." 
> 
> Man of LaMancha, D. Wasserman
> 


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