Hi,
Sorry if these questions have already been asked/answered by others, but I wasnt able to find anything in the records.
I am hoping to buy a CCR (Inspiration) early next year and have therefore started to look a bit into the details of how it works.
I am currently doing OC wreck diving, and will therefore have to switch to Trimix on the CCR unit as soon as my experience is high/good enough in shallow water. (As far as I have gathered it is not a good idea to have a END of more than 25 meters on a CCR)..
I am sure that my question are answered in the normal curriculum of the Normixic CCR Trimix course, but I was hoping somebody could expedite my curiosity before I get to that level.
1.
If you dive the CCR with air as diluent, the only variables are ppo2 and preassure in the loop vs. ambient pressure. You have to handles : O2 injection and Air injection.
Hence when you get to a specific depth and the loop pressure vs. ambient pressure has been "equalised", then it is only a matter of keeping the ppo2 level steady and remove co2. By simply measuring the pp02, you know exactly what mix you are breathing.
But what happens if you are using Trimix as diluent ?
You reach a certain depth and stop supplying diluent to the loop. The CCR will then only supply o2 and not supply diluent any more. So how do you know what you are breathing ?? There are too many variables vs. number of handles...
The body will take up Helium from the loop, and release (perhaps, depending on ppn2) Nitrogen into the loop.
So how do you ensure that you keep breathing the correct trimix at depth ??? Do you keep flushing the loop manually at fixed intervals ? Or is the uptake of Helium in the body so small that it does not significantly change the mix in the loop?
2.
How many DCI incident has been recorded on xCR's ?
I have not been able to find any such records.
It looks to me as if the DCI incident rate on xCR is low..
This is my first posting on this board, so please forgive me if I am not following protocol.. I will learn eventually. I promise.
Thanks,
Lasse
Sorry if these questions have already been asked/answered by others, but I wasnt able to find anything in the records.
I am hoping to buy a CCR (Inspiration) early next year and have therefore started to look a bit into the details of how it works.
I am currently doing OC wreck diving, and will therefore have to switch to Trimix on the CCR unit as soon as my experience is high/good enough in shallow water. (As far as I have gathered it is not a good idea to have a END of more than 25 meters on a CCR)..
I am sure that my question are answered in the normal curriculum of the Normixic CCR Trimix course, but I was hoping somebody could expedite my curiosity before I get to that level.
1.
If you dive the CCR with air as diluent, the only variables are ppo2 and preassure in the loop vs. ambient pressure. You have to handles : O2 injection and Air injection.
Hence when you get to a specific depth and the loop pressure vs. ambient pressure has been "equalised", then it is only a matter of keeping the ppo2 level steady and remove co2. By simply measuring the pp02, you know exactly what mix you are breathing.
But what happens if you are using Trimix as diluent ?
You reach a certain depth and stop supplying diluent to the loop. The CCR will then only supply o2 and not supply diluent any more. So how do you know what you are breathing ?? There are too many variables vs. number of handles...
The body will take up Helium from the loop, and release (perhaps, depending on ppn2) Nitrogen into the loop.
So how do you ensure that you keep breathing the correct trimix at depth ??? Do you keep flushing the loop manually at fixed intervals ? Or is the uptake of Helium in the body so small that it does not significantly change the mix in the loop?
2.
How many DCI incident has been recorded on xCR's ?
I have not been able to find any such records.
It looks to me as if the DCI incident rate on xCR is low..
This is my first posting on this board, so please forgive me if I am not following protocol.. I will learn eventually. I promise.
Thanks,
Lasse