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> Our scrubber is a tube made of plexiglass.  Flow is linear and the shape
> is a stack.  Hence we can see the indicator dye change colors.  We can also 
> feel the reaction heat.  It does "appear" that there is a disk shaped 
> reaction front that moves up the scrubber bed as the scrubber is used.  
> Upstream of the disk the scrubber material is cold down stream of the disk 
> the scrubber material is hot.  Hence it looks like John is correct.  I'm 
> guessing that the Cis Lunar has a radial flow stack scrubber that would 
> prevent observing this phenomena ( care to comment Rich :).  I recall reading 
> of a similar observation in disk scrubbers ( ie Mark 15/16s ) where a uniform 
> front of indicator dye has changed colors.

That's really interesting to know.  So that implies that there is a short 
window between when the pellets/granules are fresh, and when they are 
used up.  That's actually scary, because it narrows the "buffer" zone of 
time between when there is no problem, and when there is a big problem.

On the other hand, are you sure the indicator is actually a measure of 
bound CO2? I had always assumed the indicator was based on pH (just a 
guess, I don't know).  If that's the case, then there may be a narrow 
window of pH values that activate the indicator.  The disk you see may 
just be a narrow region of the zone at the threshold of the indicator.


Incidently, I have a special contract with Cis-Lunar not to discuss the 
canister in any way shape or form.  I will tell you that the times I've 
used Sofnolime with indicator, the purple granuales are more or less 
evenly distributed.

Aloha,
Rich

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