The first dive in the history of mankind on a compressed gas was made by using a closed-loop system(rebreather). Looking forward to the history, this kind of system served only elite military units. For example, at the Second World War this system was used by the British and Italian commandos. As a result of the technology development and the drastic fall of rebreathers' prices in the last decade, diving organizations started to devise qualification programs for those systems. Today, both the technical and sport divers can enjoy the diving and the benefits of the closed circuit system.
Barracuda works with IANTD and does curses of Semi-Closed Rebreatherand Closed-Circuit Rebreather
Closed circuit or rebreather "O2ptima" produced by "Dive Rite", is an electronic device, designed for decompression dives, and were originally designed for diving in head-on environment.For example, for diving in the cave, where an emergency ascent to the surface is not possible.The device is designed in such way to minimize the risk of getting the absorbent material into the respiratory system.This system equipped with two cameras, water blocking, arranged horizontally over his head near the canister. This way water cannot get into it. Special frame construction of the super durable material protects the unit from possible damage in the caves.All hoses, cylinders and regulators are compact contracted and moved, so as not to get caught in the narrow passages of caves and sunken objects.The model is equipped with Hammerhead electronics firm Juergensen Marine.
The GEM is a “passive” semi-closed rebreather, not an “active” SCR like the Drager Dolphin or the Azimuth. The rebreather allows escape of a fraction of each breath into the water column and the subsequent inhalation causes the addition of a small amount of gas to compensate for what is lost. It is basically gas-efficient nitrox. The ratio on the mouthpiece is 3:1 so you will get about three times as much time on your cylinder as you would on open circuit. It is recommended as a recreational rebreather with a depth limit of 132 fsw. It is recommended that you use 32-40% nitrox in the cylinder, understanding that with the recirculation you will actually be breathing about 4-6% less than this fraction of oxygen. As I mentioned above, along with the gas extension you also have the advantages of minimal bubbles and breathing warm moist air.
The setup is a standard nitrox cylinder (of any size) with an included Zeagle Express Tech BC. You can use any open circuit regulator and simply remove the alternate air source. In its place you attach the hose that connects to the t-piece which is an Aqualung Micron regulator that acts as a gas addition. The loop then has front mounted counterlungs at the level of the clavicles that clip onto the Express Tech and an Extend Air cartridge as a scrubber. There is a single oxygen sensor which is an “R22D”. The unit comes with either a single Jetsam display, a Fischer connector and special Shearwater SCR computer (which is upgradeable), or with just a Fischer connector that you can connect to a Shearwater computer if you already have one.
The 2nd stage of your regulator goes around your neck on a necklace and acts as your bailout or to donate to a buddy in need. Should you have a problem with the unit, you simply turn off the DSV, take it out of your mouth, and go to your regulator’s usual 2nd stage. You are then diving standard open circuit nitrox.(by Doug Ebersole)
If you are interested the GEM PSCR, Please contact us for more details.
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