Nitrox workshop dings - Divers Alert Network

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Rubicon Foundation Archive (http://rubicon-foundation.org)V. Nitrox Equipment DiscussionV. NITROX EQUIPMENTJ. Hardy: I'm going to share what I did based on the nine years and several hundred divecomputers we've tested for Rodale's Scuba Diving Magazine. I've compiled a nitroxcompatible dive computer list (10.25.00) of what is currently available. This list is not goingto be perfect, but as of the end of last month, includes 13 different manufacturers with 35models of dive computers. I may have missed a few in the process, but these computers haveall been included in tests that we've done over the last nine years and are still in distribution.I've noted the distributors Aqua-Lung, SeaQuest or Scubapro because of the various differentbrand names.Table 1. Nitrox Compatible Dive ComputersMANUFACTURERAERISAERISAERISAERISAERISCOCHRANCOCHRANCOCHRANCOCHRANDACORDACORDIVE RITEDIVE RITEDIVE RITEGENESIS SCUBAGENESIS SCUBAMARESOCEANICOCEANICOCEANICOCEANICOCEANICOCEAN REEFSHERWOOD SCUBASUUNTO*SUUNTO*SUUNTO*UBSUBSUWATEC**UWATEC**UWATEC**UWATEC**ZEAGLEZEAGLEMODEL300G500 AI750GTAtmos ProSavantCommanderCommander NitroxNemesis +Nemesis Ila NitroxEquano2XTranscendNiTekNiTek3NiTekCNitrox ResourceReactSurveyor NitroxData PlusData Plus 2Datamax Pro PlusDatatrans PlusXTC-100Ocean O2 NitroxLogicCobraSolution NitroxVyperChameleonNitrox Pro2Aladin Air X NitroxAladin Air Z O 2Aladin Pro NitroxAladin Pro UltraStratus IStratus II* Distributed by Aqua Lung & Sea Quest** Distributed by Scubapro175
Rubicon Foundation Archive (http://rubicon-foundation.org)Lang (ed.): DANNitrox Workshop, Divers Alert Network, November 2000J. Hardy: It is very simple math for a dive computer to handle nitrox. It is not complicated forthat microchip to do the job. What it is essentially doing, at the risk of oversimplification, ismoving the no-decompression line over based on NOAA's materials. Virtually all computerssay that in their literature. Most of them have a way to adjust the PO2 either on the fly orbeforehand. The typical range is from .21 to 1.6 atm. Many computers will have ademarcation at 1.4 and 1.6 atm. Others must be preset before the dive. You set the O2percentage, which can be anything from 21 (air) up to 50 percent. A few models go all theway to 99 or 100 percent. Variability comes in what the manufacturers share with us andwhat we're able to test, which is, what the computers track and how they track it. That is notclear among the manufacturers. You should also realize that practically all manufacturers aremoving towards nitrox computers. You're going to see an era when all computers have anitrox program. It's simply a function that you call up when you want to use it. On the faceof the computer it has air and if you want nitrox, you simply punch up that screen and gowith nitrox. I also predict that all dive computers will eventually interface with desktopcomputers.NITROX EQUIPMENT DISCUSSIONM. Lang: As we start this discussion, I ask that you be very crisp and precise in your commentsso that we can most effectively use the remaining time.T. Mount: We're discussing something already involved in the standards. The manufacturersare producing nitrox regulators, which takes precedence to what the training agencies sayanyway. IANTD says anything up to 46 percent can be used without special cleaningprovided it meets the specifications of the manufacturer. We default to the manufacturer.B. Gilliam: I agree completely with Tom that the agencies would really like to have the onus puton the manufacturers. The one thing that would help all of us is if there was consistency andcommon sense throughout the process. We all can see where the potential fire hazards are inthe high pressure side of the first stage of a regulator. Is it necessary for us to get veryconcerned about the second stage where the low pressure is really not much of a fire hazard?We get very passionate at times in these discussions about "to clean or not to clean", butnobody ever brings up the issue of cleaning the other components. If you have to clean thesecond stage of the regulator then you also have to clean the low-pressure inflator thatinflates the BC. I don't know anyone who's ever taken that path. What about HP hoses andsubmersible pressure gauges? If you were ever going to have a fire, it would probablyhappen right there in the SPG. The whole equipment package should be looked at, whichwould help everybody come to agreementB. Wienke: I agree with Jon's comment that all dive computers are probably going to be nitrox.Some dive computer manufacturers (e.g., Suunto and Cochran) are also going to include trimix.The reason why they haven't gotten into the tri-mix business to date is because ofliability. The technical diving community is driving that. Presently, all computers, exceptfor a very few, are typically Haldanean models. These are dissolved gas models with M-values if they're U.S. Navy, or Buhlmann values. That's going to change in the future to dualphase models brought up on risk computers because the computing power and the memory issufficient to perform phase calculations.176
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