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In message <Pine.SOL.3.92.960531114511.21968A-100000@hs*.us*.ed*>, "Peter N.R. Heseltine" <heseltin@hs*.us*.ed*> writes > > >On Fri, 31 May 1996, Chris Hellas wrote: > >> >The Atlantis I uses a laser bored synthentic semi-precious stone and >> >requires a closed test on the surface to ensure that the system fills. The >> >only available orifice in the US is the 7.5 liter one. >> >> The other orifices are now being shipped in the UK. > >I am concerned about using orifices that have higher flow rates but much >lower FI O2s. Particularly when ascending rapidly or excercising hard at >25-40 fsw. What do you think? The trick before ascent is to flush the loop prior to commencing your ascent. This is done by inhalling the loop and exhaling through the nose three times. This should bring the FI O2 back up to something like even if you have been exercising hard. As far as generally exercising hard goes,the guy's @ Draeger are quite adamant that even with a metabolic oxygen consumption of 2.5 litres per minute (which is quite high!) the FO2 in the loop should not drop below 18 percent when the 50 percent O2 orifice is used. I have not seen any data relating to the other orifices - I'll do some digging. Personally I have no problems with the design. It is very simple and for it's intended market is ideal Regards Chris Chris Hellas e-mail:- chris@de*.de*.co*.uk* ********************************************************************************
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