Rebreather World - View Single Post - Is there a simple solution to CO2 break through?

Genesis · 30th November 2005, 14:34

How about this....

A small (inline) cannister with color-indicating sorb in it.

With an LED and phototransistor mounted in there.

The idea here is NOT to absorb a significant amount of CO2 - it is to provide a "you're screwed!" breakthrough warning quickly enough so you can bail before you pass out. The monitoring could either be integrated into existing electronics or stand-alone - it wouldn't take much in the way of power as the LED doesn't have to be on all the time - a pulse emission every 10 seconds or so is fine.

I'm thinking a 2x2 section of tube with the sorb and sensor in it. It would hold almost nothing, and thus be cheap to change - you could even make it up as an "inline cannister" with QDs so you could carry multiple ones for a given day's diving, and swap to a new one for each new dive (you have to know there's new sorb in there, because the violet color fades after a while - even though the sorb is still consumed!)

What 'ya think?

30th November 2005, 14:34	#2 (permalink)
Genesis Bubbless Box of Death Current Rebreather/s: Home Build Other Rebreather/s: Home Build Join Date: Oct 2005 Location: Sunny Florida Posts: 1,395	Re: Is there a simple solution to CO2 break through? How about this.... A small (inline) cannister with color-indicating sorb in it. With an LED and phototransistor mounted in there. The idea here is NOT to absorb a significant amount of CO2 - it is to provide a "you're screwed!" breakthrough warning quickly enough so you can bail before you pass out. The monitoring could either be integrated into existing electronics or stand-alone - it wouldn't take much in the way of power as the LED doesn't have to be on all the time - a pulse emission every 10 seconds or so is fine. I'm thinking a 2x2 section of tube with the sorb and sensor in it. It would hold almost nothing, and thus be cheap to change - you could even make it up as an "inline cannister" with QDs so you could carry multiple ones for a given day's diving, and swap to a new one for each new dive (you have to know there's new sorb in there, because the violet color fades after a while - even though the sorb is still consumed!) What 'ya think?
(Offline)