Quote: (Originally Posted by
RZEP17)
Hi again
Some more questions for Tom Rose.
Being so informative, about your device, I hope you don't mind few more questions, Tom.
The O2 drying flow - you have to find a compromise between drawing adequate gas sample for monitoring CO2 and still not affecting to much the PPO2 in the loop. Is there a potential for the hyperoxia in certain situation like rapid decent? And again my understanding is you are using some kind of orifice/ venturi tube in your aspirator. Is there potential, pardon my language, for sucking in some sorb dust and plugging it? Finally the mysterious(for me) membrane open for water vapors and impenetrable for the CO2 molecules. Can you say something more about it or it is a trade secret?
rgrds
Tomek
The flow volume through the sensor path is very small compared to the flow volume through the loop such that the effect on concentration in the loop is indetectable.
The issue of plugging came up early in my discussions with other divers....it actually came up in those discussions at the DEMA Rebreather Party in Los Vegas when I was describing the concept...(it always helps to have some other eyes on a project)...I frankly had not even thought that far in advance. Placement of the filter became an interesting problem that was solved when I devised the retrofit package I showed at DEMA. As soon as the Holidays are over and my life gets back to normal (or as normal as my life would be to most observers) I will post a picture and a description of the retrofit package as shown at DEMA.
Tom