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John,

I was just cleaning out my inbox when I came across your post on modeling 
CO2 absorbtion.  Good stuff! In the context of your model, my earlier 
thoughts on color indicators as "true" indicators can be stated as 
"perhaps the indicator has a larger k value than the scrubber absorbency".

> >Another way to do it is to put in a CO2 sensor.  This won't help you
> >predict the remaining life of your canister, but it will probably give you
> >early warning of an increasing loop PCO2 before physiological symptoms
> >alert you to the problem.
> 
> What do you think of using an array of temperature sensors ?

I imagine they would have to be calibrated for any given water temp, so 
that is probably not a practical solution.  From your model, I see that a 
CO2 sensor migth be useful if k is small, but it would have to be very 
sensative.

I still think volume O2 consumed is the best method when you consider 
both practicality and accuracy.

Aloha,
Rich

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