Who needs bubbles? Dive Silent. Dive Longer. Dive Rebreather.
What is a rebreather?In a nutshell, it is the future. Closed Circuit Rebreathers (CCR) are cutting-edge scuba diving technology, and require specialized training and equipment. Rebreather systems filter out the CO2, or “scrubs” the air you breathe, recycling the gas in a closed-loop so there are no bubbles, YES NO BUBBLES. With rebreather diving you dive in a silent world, getting closer to marine-life than you ever thought possible. They will barely know you are there! This allows you to get some truly amazing photos and videos. CCR also enables divers to stay down longer, anywhere from 5-10 hours - it is about as close as you are going to get to living with the fishes. Serious expedition divers, cave divers, videographers and photographers are just some of the people who use closed-circuit rebreathers – and now you can too. Just call to get started.
The 2014 Course Schedule:
Tuition: $1500USDplus expenses like boat spots (600) and other materials (300).
Included: Rental and retail CCR units at huge discounts, small classes (3-4 students), all academics, pool training dives, ocean dives, and Prisim2 CCR certification.
The Instructor: Eco Dive Center is proud to work with world renowned diver Jeff Bozanic. Jeff has been diving for over 40 years. A prolific writer, adventurer, and scientist, he has participated in over 70 scuba diving expeditions to countries scattered around the globe. He is known for his work in Antarctica, cavediving, and most recently with rebreathers. He is the recipient of many awards, including being honored as the DAN/Rolex Diver of the Year.
The Hollis Prism2: The Prism2 is a fully closed circuit Rebreather, ideal for exploring open ocean, cave, or wrecks. This unit can be electronically or manually controlled which means you choose how you want the loop PPo2 maintained. Includes shoulder mounted counter lungs and rear mounted radial scrubber which provides easy breathing with low resistive effort and low hydrostatic loading. The standard kit includes an electronic secondary control and primary LED displays with a back-plate/wing assembly that provides a complete kit ready to dive out of the box. Unit can also be purchased with or without tanks/valves.
Electronic CCR (Closed Circuit Rebreather)
Radial scrubber design provides lower resistive breathing effort and more efficient scrubber use
Primary HDD (Heads-Down Display) is a battery driven sequential LED for continuous hands-free monitoring
Over the shoulder counter-lungs for decreased work of breathing
O2 supply lines and solenoid are external from the breathing loop - removing the risk of O2 spikes due to O2 connection leaks. O2 is safely vented into the surrounding water column.
Pre-dive user selectable PO2 set-points
Standard Diluent and O2 bottle size: 19 cuft (2.7 liters). Accommodates 13 cuft (1.9 liters), 19 cuft (2.7 liters), and 30 cuft (4.4 liters).
Electronics and the battery are housed on their own outside of the breathing loop
40 hour battery life (in 70F water temp) with standard 9V alkaline battery
Purge drains at the base of each counter-lung
Waterproof magnetic slide on/off switch used for reliability
3 redundant O2 sensors for reliable O2 management
The Prism2 gains gas efficiency by circulating breathing gas in a breathing loop, unlike an open circuit SCUBA system that dumps the exhaled gas with each breath. The Prism2 maintains safe oxygen levels, removes CO2 from the breathing loop, and delivers warm breathing gas to the diver. The Prism 2 accomplishes this through the following breathing loop cycle:
1. The oxygen and Diluent (air, trimix or heliox) tanks provide the source gas. 2. Exhaled gas enters the breathing loop, and a one-way valve inside the Dive Shutoff Valve (DSV) directs the breath to the righ side counter-lung. 3. The right side counter-lung is the location of the manual oxygen addition valve and system over pressure relief valve. 4. The exhales gas then enters the scrubber canister where the carbon dioxide is removed. 5. Gas leaving the scrubber passes the three (3) O2 sensors which analyze the breathing mix, and the Prism 2 electronics add oxygen as required. 6. The breathing gas passes through the left side counter-lung where the manual diluent addition valve is located, and maintained gas volume is available for breathing. 7. Gas leaving the left counter-lung travels again through a one-way valve in the Dive Shutoff Valve (DSV). 8. The gas is inhaled by the diver, and the next exhalation begins the cycle again.
The scrubber system:
The PRISM rebreather system, including the scrubber, is founded upon a long engineering history of creative and innovative breathing system designs.
ABS is the material of choice for Prism basket because it has lower thermal conductivity than stainless steel and aluminum, i.e. does not dissipate heat quickly. Maintaining a higher temperature is more efficient for your chemical reaction, which contributes to better duration. ABS also does not offgas.
The use of an ABS cage with a nylon screen and open cell foam pads top and bottom, reduces grinding and dusting of grains by dampening most of the vibration; this is a benefit of a more elastic structure.
A flexible ABS structure also reduces channeling by providing continuous compression and minimizing particle movement. Slight loss of material due to dusting, is compensated by the pressure of the screen and pads taking up small voids and reducing dead space.
The overall cost of molding components long term, versus the cost of fabricating them with stainless steel is significant especially in a small niche market. The increase in scrubber performance has made the cost advantages worth the initial investments of design and tooling for an ABS unit.
Gas on the PRISM passes at fairly high speed directly from the diver’s exhale counter lung into the head and straight down the center of the scrubber. As it diffuses out its velocity slows as the cross sectional area in the scrubber increases (long dwell time); the gas then flows out of the scrubber at slow speed. Combining the lower velocity with a temperature drop at the bucket wall (the dew point) condensation appears on the bucket all the way up to the head ring (even with a clear, plastic, insulated bucket there is a steep temperature gradient on the bucket wall). The gas then passes through slits in the head, increasing in velocity as the cross sectional area decreases; the gas moves quickly across the sensors, out of the head into the inhale counter lung, returning to the diver’s lungs for a another cycle.
The science of it: Technically speaking, as open circuit (SCUBA) divers we rely upon filling our lungs with airfrom a pressurized gas tank with every inhalation and then exhausting that volume of air into the surrounding water with every exhalation. As we descend deeper the water pressure around us increases and the volume required to fill our lungs increases. In other words, our air supply depletes quicker the deeper we dive. A rebreather recycles rather than vents the exhaled breath. The exhaled breath passes into a closed loop, where it is pushed through a chemical absorbent (scrubber) to remove the carbon dioxide, and returns through the other side of the loop for the diver to "re-breathe", hence the name "closed circuit rebreather" or CCR.
The future is here.
To get started or for any questions call 310.398.5759