rebreather deco

[mupwi]

hi I am prety well read in terms of rebreathers and how they work technicaly.
My one question is when it comes to deco how do you calculate your no deco times or sit times when you have a constantly changing gas mix. Surly not with tables so do you just dive conservativly or are there special dive computers for this which can check your mix constantly

 

[Jon]

There are special tables that you use called constant PP02 tables. You can set your rebreather at a certain set point and run them off the tables if it's a full CCR. For a short dive you might set it at a 1.4 and for a longer dive you would set it lower- say a 1.0. Most people use the tables as back-up's and run a computer, or two, to manage their deco. There are also bail-out open-circuit tables in case the rebreather fails on the dive.

You should check out the Rebreather World website for more information.

Jon