Carbon Monoxide Poisoning! | DIVE STORIES 

Here's one: ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-rIliGZjcyls.html

there are dedicated gas analysers for divers, but most don't test for carbon monoxide, they only measure oxygen content, and the expensive ones measure helium content.

@@tonfleuren3536 They don't do much good if your air is contaminated and they don't test for CO.

Well said!

CO is one of the contaminants that's discussed and covered during even Open Water training. Our local dive shop owner and his wife came across the same problem in the Dominican Republic. They found out after the aborted dive that the intake for the system was right next to the exhaust of the compressor at the fill station.

Egads, that's bad!

I wonder where he got his nitrox filled?

@Navy1977 yes Beth on CCR

@Navy1977 no the PPO2 is displayed but not CO2. The three units are oxygen sensors so you still have to rely on your own experience to know when you’re getting a CO2 hit if you are over breathing your loop. A gas analyser analyses a small sample that goes through it and as different gases are different weights even if you have a good procedure for analysing the gas there is a chance there could be something else in there that does not make it into the analyser, but you eventually will breathe, especially if you get gas from an unknown source you might be diving in a fairly remote area and be relying on a dive shop that you’ve only known for a short time. Some expeditions make it virtually impossible to bring all of your own gas. So a real time sensor would solve this, it would give you warning that there is a problem but it’s extremely complex technology which I would imagine it’s going to be awhile before it’s miniaturised and cheap enough to be used in diving. 🙂

Carbon Monoxide (CO) not Carbon Dioxide (CO2) was the issue.

They also need to be regularly calibrated. That's expensive too.

It can happen with any compressor.

@Navy1977 most analysers (at least the ones I've seen) only measure oxygen, or oxygen and helium content. I've always wondered why they don't test for carbon monoxide, but I learned today that those do exist.