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Sentinel Rebreather...





VMS SENTINEL REDHEAD
REBREATHER TRAINING


Training on the Sentinel RedHead CCR at Vobster equips divers with the skills to add a whole new chapter to their diving.

Vobster offers Sentinel RedHead training through IANTD, beginning with CCR user, progressing through Normoxic (60m) and Trimix (100m) levels to the 120m Expedition Trimix qualification. CCR user is available with either 42m limit for an air diluent or 48m limit with an ART diluent.
USER-LEVEL TRAINING
User level training begins with a full unit stripdown and rebuild, identifying all components for gas control, backup systems and monitoring. Diving begins with a gradual orientation of all controls, moving onto breathing loop O2 control via automatic and manual systems.

This foundation is built on with progressive training through different modes of operation, watermanship and buoyancy control until multipart safety skills can be accomplished confidently. The result is a diver who understands the mechanical, electrical and gas blending options on the Sentinel and how these systems interlock to provide a world leading level of life support.
POST-TRAINING SUPPORT
Vobster Quay are proud to follow up training on the VMS Redhead with exceptional support services. We encourage new CCR divers to continue to access the benefits of their training with post course mentoring on the Sentinel and offer unrivalled support for development and review post course. Support is available by phone or email to assist with CCR learning curve as you take your new skills and unit on new adventures.

Vobster Quay also offers 1:1 CCR coaching at £180 per day for refreshing skills at the start of the season, after an extended break or just to tune everything up.

SENTINEL REDHEAD CCR
TRAINING ENTRY POINT



Once upon a time, only hardened tech divers would even consider a rebreather, mainly to save money on trimix. Now we know that the additional benefits of warm, moist gas, optimised deco, no bubbles, low gas bills and dive flexibility with multiple backups create many more advantages for divers of all levels.


As diving a constant PO2 rebreather means our breathing gas gets richer the shallower we get, we need to understand accelerated deco, so the normal route into CCR diving is to complete Advanced Recreational trimix on open circuit first.

However, more divers are thinking about rebreathers earlier and don't see the need to invest in OC gear, before buying a rebreather. IANTD offers a route for these divers, by allowing them to complete ART and CCR User as a combined course on the rebreather, without any OC dives. This means that as soon as you are a confident AOW diver with a Deep Spec, you could consider a Sentinel RedHead CCR course with us. A great first step is a Sentinel RedHead experience day, consisting of unit intro and approx 40 min dive to 12 metres.

Alternatively, some divers benefit from progressing to OC Normoxic and getting a taster of the big dives ahead, before switching to the Sentinel RedHead and it's benefits for technical diving.

For the very ambitious, IANTD offers a route to begin diving on a CCR at Open Water level - please contact us for details and prices.


SENTINEL INSTRUCTORS
MEET THE TEAM



At Vobster Quay, we can offer Sentinel Training to ART diluent level and higher level training (including instructor training) can be arranged through our network of experienced and highly trained instructors throughout the UK and beyond...


TIM CLEMENTS
IANTD Sentinel Instructor
Tim started diving in 1990 while studying Marine Biology and Oceanography, becoming a BSAC Advanced Diver in 1993 and taking part in several scientific diving expeditions to Southern Ireland.

Following an MSc in the Orkneys and an HSE Part IV qualification, Tim worked across the spectrum of diving, including environmental survey work, aquarium diving and media projects.

Eight years of aquarium education programmes has given Tim a deep enthusiasm for revealing the underwater world to divers and non divers alike, even converting an old sewage works in Fort William into a public aquarium based around human marine exploration.

His diving has taken him to many countries, wrecks, reefs and a couple of caves. Although Tim has also occasionally been persuaded to dive in warm water, he is convinced the UK offers some of the best diving in the world.

Tim began technical diving in 1999, taking part in the 990 magazine expedition to the Bullring in 2002 as underwater videographer.


CCR DIVING MADE EASY
ESSENTIAL INFO...



CCR might initially look like the personal equivalent of a moon landing training programme, but at the heart of every rebreather is a very simple process that can be mastered by any competent diver.

Having decided on your diving gas, inhaled it, then exhaled it, it now contains less O2 and more CO2 than it did. Since it is being recycled and 'rebreathed', all we need to do is remove the CO2 and inject some more O2.
CO2 REMOVAL
First of all, CO2 removal. For this, we need some chemical absorbent and a one way loop to make sure it goes through the absorbent. The one way flow on the Sentinel is achieved using delicate valves on the side of the mouthpiece. The absorbent is Sofnalime 797, which is efficient and fairly flood resistant. The process is simple - you breath, the gas goes round the loop and as it does, it spends enough time in contact with the 'sorb' to remove all the CO2. After the sorb a CO2 monitor checks to ensure there is no more CO2 than normal.
O2 REPLENISHMENT
Second O2 replenishment. This is a bit trickier - we could end up with too much or too little, neither of which are good. The process goes something like this if we stay at one depth. You breath out - the gas passes through the CO2 absorbent and into a chamber where three O2 cells check the O2 content. If it has dropped, the computer takes this info and fires a solenoid, allowing a little O2 into the loop, before the sorb. This is mixed as it flows through the sorb and then analysed again. If it's still too low, the solenoid fires again, if not it waits until you metabolise some more gas.
LOOP VOLUME
Now, let's think about what happens when you descend. Boyles Law says that the volume in the loop will decrease, which means that the next breath in will be hard. This is where a simple valve on the side of the rebreather (just like in a normal second stage) is pulled in, opens a demand valve and our diving gas (not O2) refills the loop. Now we have the volume to breath and the rebreather analyses it to check if any more O2 is required.



Once we get to our chosen depth, the rebreather makes sure our O2 content (PO2) stays at our chosen level. Of course, dropping down again, increases the PO2, possibly to an unsafe level, so buoyancy control is as important as it was on your basic nitrox course!
SMOOTH ASCENT
On ascent, we do need to concentrate. As we ascend towards the surface, two things happen - first the breathing loop expands, creating extra buoyancy. We can vent this through the nose and stop it being a problem.

Secondly, the PO2 within the breathing loop will drop, which means the solenoid will add some more O2 - excellent, this will make our deco more efficient. However, this is also volume, creating some buoyancy, so a bit more venting is needed. One of the key features of training is to get used to this new style of ascent and understanding what happens to our breathing gas.




SURFACE WATER TEMPERATURE
17.5C
RECORDED ON:
07-06-2017   09:22

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CCR Multi unit try dives at Vobster Quay 3/4 July. Couple of last minute cancellations means spaces available again. JJ, Liberty, RedBare, Mk7 AP Triton and SF2 available with Martin Robson, Kieran Hatton, Dave Gration, Vikki Batten and Paul Paul Vincent Toomer. Please pm me for details, one space available at a discount. Cheers, Tim Clements

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