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I don't know the specific rexaction but O2 is part of a chemical reaction the generates a small amount of electricity in proportion to the concentration of O2. The current generated must be amplified and sent to a digital or analog gauge or other device (warning, etc.) where values are displayed as pO2 units in the former two and as a beep or flashing light in the latter. Sensors for the BioMarine CCR155 last about 4-6 months under ordinary use. Once it is removed from its air tight package, the reaction with oxygen is continuous and irreversible. It may be slowed by storing the sensor in an atmosphere of N2 or other inert O2-free environment. It may also be stored in the cold to slow reaction. They are disposable. You can't refill them yorself or if you build one yourself the cost of your time becomes more than the $95 each for three sensors required for the unit. Buy new ones a couple of companies in the US make sensors. On Wed, 11 Oct 1995, A.Appleyard wrote: > When I had a one-day introductory course with the Prism rebreather, I was > told that ppO2 sensors are little fuel cells that produce electricity at a > rate proprtionate to the ppo2; what you see showing the ppO2 is a microammeter > reading that current. As they are fuel cells:- > (1) What fuel do they use? > (2) How long do they last? > (3) How to refuel them when they run empty? > (4) If a rebreather has ppO2 sensors in, so they don't burn themselves up > for no purpose, it should be possible, if the rebreather is going to be in > store for a long time without being used, to:- > (a) take the sensors out and keep them in an oxygenless atmosphere, or > (b) fill the rebreather with oxygenless gas. > -- > Send mail for the `techdiver' mailing list to `techdiver@terra.net'. > Send subscription/archive requests to `techdiver-request@terra.net'. >
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