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my open-circuit gear. Assembly time is longer (about 20 minutes) than with open-circuit but is offset by not having to change tanks during the dive day. The scrubber needs to be changed out every several hours of dive time and the oxygen sensors last a year or so. For more information on rebreathers check out: www.rebreatherworld.com is widely recognized and has a highly knowledgeable member base. You can join the forum for great interaction. www.thedecostop.com covers rebreathers in addition to other fields of technical diving, like cave diving and deep wreck exploration. IANTD-www.iantd.com or TDI/SDI-www.tdisdi.com provide straight-forward information and explanation on how various types of rebreathers function, plus instruction on using rebreathers. Closed-Circuit Rebreathers Inspiration/Evolution - http://www.apdiving.com KISS - http://www.jetsam.ca Megalodon - http://www.customrebreathers.com Pelagian DCCCR - http://www.rebreatherlab.com Prism Topaz - http://www.steammachines.com Optima - www.diverite.com Ouroborus - www.ccrb.co.uk rEvo II – http://www.revo-rebreather.com Submatix CCR 100 - http://www.submatix.com Titan - http://www.bubbleseekers.com Down to Dollars and Sense The last myth is cost. While rebreathers definitely are more expensive than a buoyancy compensator, a regulator, and a couple of aluminum 80s, the costs have come down considerably. While some models like the Ouroborus (www.ccrb.co.uk) still cost $15,000 or more, others such as the Sport Kiss (www. jetsam.ca) can be purchased for around $4500. A last example of rebreathers moving into the mainstream is provided by the International Association of Nitrox and Technical Diving (www.iantd.com). This training agency now offers an Open Water CCR Diver certification. This is an entry level certification and allows one to dive a rebreather to a depth of 70 fsw or to 100 fsw accompanied by an instructor. Diving closed-circuit rebreathers is certainly not for everyone. Complacency and being overly comfortable with your unit and/or taking liberties with maintenance or diving protocol, will eventually lead to unfortunate results. However, if you are an avid diver and very attentive in your diving practices, rebreathers are very safe and can greatly enhance your diving experiences. v www.underwaterjournal.com June/July 2007
Dive Computers for the Recreational CCR Diver The advancement in dive computer design, type and capability has come a long way from the first Orca Edge, an air only, brick size computer that was considered state of the art in the early 1980’s. Today, dive computers not only come in units the size of a wrist watch, but also have the ability to work one, two, even three mixes during a single dive in both air and nitrox percentages as high as 99 percent. For the recreational CCR diver who is mainly interested in keeping to depths within 130 feet, can pretty much get a way with a run of the mill nitrox computer. The downside is that, that diver must adhere to the FO2 percentage programmed into the computer that matches his/her PO2 at the max targeted depth of that dive. For example, that max depth of the dive is 80 feet, the diver is going to run their PO2 at 1.3, which will be equal to 38%, that diver should conduct their profile for the dive as is to conduct as having only 38% regardless if of weather or not they go no deeper than 60- 70 feet. That is with a one gas computer. Two and three gas models, most of which run below the $600 range, allow the same diver to design a profile with a bit more flexibility. The first setting will be reserved for the bottom PO2 mix equivalent, the second mix setting can act as either their deco mix or as richer mix setting for the second half of the dive, if the diver plans to work his or her way shallower as the dive progresses. Two Mix Nitrox Computers: Dive Rite NiTek Plus & Duo TUSA IQ-700 Apeks Pulse & Quantum Cressi-sub Archimedes II Suunto Vyper2/wristwatch model D6 Uwatec Tec 2G Three Mix Nitrox Computers: Oceanic VT3/wristwatch model Atom 2 Aeris Elite T3/wristwatch model Epic Suunto Vytec DS/wristwatch model D9 Note: When it comes to labels, the Dive Rite Duo, TUSA IQ-700, Apeks Pulse and Cressi - sub Archimedes II are all essentially the same computer built by Seiko. Oceanic and Aeris computers are manufactured by Pelagic Pressure Systems, of San Leandro, Calif., whereas both Suunto and Uwatec are manufactured uder their own name. Computers Specifically Designed for CCR’s Currently in Production Cochran EMC 16/20H www.divecochran.com HS Explorer - www.hs-eng.com Shearwater GF - www.rebreather.ca VR3 - www.vr3.co.uk New Computers on the way Dive Rite NiTek X - http://www.diverite.com Liquivision X1 - http://www.liquivision.ca OMS DCAP-X - http://www.omsdive.com CCR Specific There are a lot of decent opencircuit computers out there. But, once you go beyond VR3 with Spectrum color LCD mainstream and into more specialized systems that get into constant (or semi-constant) PO2, the game changes completely. All are aimed directly for CCR’s with most providing the ability to run a gambit of gas mixes from air to heliox for both open and closed circuit diving applications. With the exception of Cochran, these systems have the further ability to monitor a CCR’s PO2 progression (via a cable linkage to the rebreather’s O2 sensors), as well as run real time gas calculations. The downside of course is cost with most these models running between $1,400 and $2,000. If your plans don’t see you moving out of the recreational range and into the world of trimix, but you still like something beyond a basic one-gas or two-gas nitrox computer, two options with programmable PO2 set point features under a $1,000 include: Cochran EMC 16, manufactured by Cochran Undersea Technology, and the VR2 manufactured by Delta P Technology. www.underwaterjournal.com June/July 2007
Page 1 and 2: Issue 3 June/July 2007 - RebReatheR
Page 3 and 4: An Uncertain Future During my trave
Page 5 and 6: By Douglas Ebersole ClOSEd-CirCuiT
Page 7: About Time The other reason is time
Page 11 and 12: Adventure Diving It’s four thirty
Page 13 and 14: make maintaining a specific depth i
Page 15 and 16: pangas, the Solmar V positions its
Page 17 and 18: Left: For underwater photographers,
Page 19 and 20: The comfortable main salon features
Page 21 and 22: Stepping off the Republic IV, I beg
Page 23 and 24: In the waters of Florida’s east c
Page 25 and 26: Back in the Day When I hear some di
Page 27 and 28: 27 NEW Freeport, Grand Bahama Depar
Page 29 and 30: “It’s not a just a fishing prob
Page 31 and 32: What Are You Doing This Summer? You
Page 33 and 34: • Bahamas • Saba/St. Kitts •
Page 35 and 36: For rinsing the inside of your BC,
Page 37 and 38: the simple solution Left: The man b
Page 39 and 40: Dive Florida America’s Underwater
Page 41 and 42: Hooked on Many a diver has a favori
Page 43 and 44: Like all polycheates, marine worms

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