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I agree with your observations about semi-closed units and the need for knowing what your breathing gas. You suggested plumbing in an O2 sensor. My O2 analyzer sensor (a teledyne) doesn't even recommend conditions of high humidity let alone being exposed to Salt Water at depth. Can you recommend some way to plum in a sensor that would be of any accuracy and still last more then one dive. To the best of my knowledge I haven't seen anything that would work. Buying a Closed Circuit is to tricky right know, and the Atlantis even with it's faults has proven to be a fairly safe unit when used within it's capabilities. Any info would be appreciated! Thanks for the response, Steve Merenkov, PADI, IANTD & TDI Instructor steve_merenkov@ms*.co* ---------- From: Bill Brooks Sent: Tuesday, October 29, 1996 7:09 PM To: techdiver@terra.net Subject: Re: Atlantis 1 EAN/Flow Combinations? Plumb in a sensor and you can verify your own work rate and the validity of your calc's. I would rather be diving a fully closed unit with dead electronics than a semi without a sensor. A clogged orifice or reduction in supply pressure will reduce your flow. Anyone who thinks that will never happen has no business in water deeper than his ankles. If your flow declines you may have enough gas to maintain your buoyancy and hear a flow of bubbles, but be more than a little short on o2. A fully closed unit will loose buoyancy as your ppo2 drops or gain buoyancy as excess o2 is being added. Plumb in a sensor, without one you have to ask yourself "Do you feel lucky? Well do ya' punk?" Bill PS It is ironic that people seem to have a fear of fully closed units and think that semi's are volksbreathers when the potential for virtually undetectable hypoxia with a semi is so much greater. >I'm a TDI Instructor for the Atlantis, and I know there's a few others on this >list. I know that by using the Atlantis >rebreather formula you can go outside the normal 60, 50, 40, 32 EAN mixtures >to gain a balance >between depth (MOD) and Dive time, (i.e. 138, 105, 75, and 51 Minutes). > >Can you share some of the combinations that you may have actually tried and >that work well. > >I'm looking for the best balance, I'd like to get say 138 Minutes, or say 3, >40 minute dives, with a MOD of 80 FSW. > >This would require the 5.8LPM flow meter with say a mix of 45% EAN. At an ATA >of 1.6 a MOD of 84, and >a bag mix of about 21% depending on Workload LPM (approx. 1.75). > >Or say, two 45 minute dives with a MOD of 100FSW. This would require EAN 40 >with a flow of 7.6LPM again giving a bag mix of about 21% at 1.75LPM Workload. > -- Send mail for the `techdiver' mailing list to `techdiver@terra.net'. Send subscription/archive requests to `techdiver-request@terra.net'.
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