| FYI: the probability of two galvanic cells going down with a ceiling fault during a single dive is 85K hours. Replace them at the same time from the same batch, then 5.6K hours. With a ceiling fault, your ears are going to have to be pretty good at integration if you are going to come out alive.
Why are people using galvanic sensors anyway? Because they exist, are easy, do not involve change. Sol-gel and opto sensors are available and are the future. They are already in use in medical O2 and CO2 applications.
In a few years time, the O2 and CO2 sensor will be printed onto the scrubber cartridge. Throw away. Just like on food packaging. I have put a post on this onto the Open Revolution area, with links showing the technologies working.
Alex |