Sentinel LSS - Trip Report

***Decodiver*** · 24th March 2008, 14:16

Quote: (Originally Posted by Frankie Pellegrino)

Guys Best of luck with the new toy!! I'm very interested in hearing how your trim is. The counter lung behind your head makes me wonder.

Dave

1)Do all the hoses come plastic coated?
Is that cover crimped into the brass sleeve or is it just slid over the whole hose?
2) Could you bring your Sentinel to the States in April??

Again Best or luck guys ....I wish I was there playing with your new toy :-)

Cheers Frankie

Hi Frankie,

I think they are Miflex hoses and all are covered with this coating, very flexible though.

Miflex Xtreme - Safety When The Pressure's On !

The coating passes under the fitting which is quite long and not like a traditional short crimp.

Not sure I am gonna make April yet, will let you know buddy.

Cheers,

Dave.

Barrie Law · 24th March 2008, 20:12

Hi Guy's,

Day one started in earnest with someone knocking my cabin door down as I had overslept and was late for the 08:30 breakfast but considering I had been travelling for 2 days sleep was badly needed. Everyone was bustling around the breakfast room and filling out the paperwork that included registration forms, current cert levels, disclaimers and the like.
This was followed by a briefing from Kevin about the day’s Itinerary that would start off with a strip down and rebuild of the loop section & scrubber unit body on the Sentinel LSS and following some lunch would continue with a unit set-up and scrubber packing session.
We have a mixed bag of experience from divers who are learning how to dive a CCR for the first time (5) to divers with previous CCR experience (12) of which 2 are Instructor Trainers and one is an Instructor Trainer Trainee making a full boat of 20 divers. So a real mixed bag of divers with 5 visiting from the USA, 1 from Oz, 1 from Korea and the rest are from all across Europe.
But getting to the good stuff about the Sentinel it has an Axial scrubber mounted into a three section unit consisting of the head with the sensors that are Teledyne R17D’s and the bayonet connectors have screw locking caps to that ensure they remain secure during diving . They are mounted in the inhale side so the breathing gas that has been expired travels into the head of the unit where the Oxygen is added and it passes through the scrubber from top to bottom and returns back up the outside of the scrubber canister and past the sensors to be re breathed. The head has a high pressure solenoid fitted for Oxygen addition that is factory service-able and does not require any user maintenance and will operate with up 20 bar supply pressure using Poseidon Extremes Regulators selected because they met the quality requirement for the Sentinel and they are also the only Regulator certified for use to 100 mtrs.
Next there is a central tube that houses the scrubber and a then base section that also has the loop over-pressure valve and a hose that is located roughly at the Lung Centroid designed to dump from the over pressure valve equally at any position in the water, the over pressure valve is adjustable the same as a dry suit shoulder dump. The whole canister is made from Delrin that has been machined to quite a high tolerance so removing sections and re-assembling is a bit of fun with everything being a bit ‘new’ and needing to seat properly but the feel is very solid and the design appears very well thought out with most removable parts having primary & secondary locking mechanisms.
The Counter-lung is a 4.5lt single bag that sits at the back of the scrubber head and it has a push connector and a locking catch and there are also push fit connectors with locking nuts on the loop mouthpiece hose assembly connectors and they all have button release mechanisms to remove them for cleaning & servicing. The Sentinel comes with a BOV that uses a Poseidon 2nd stage for the O/C bailout and this is meant to be used for ‘sanity’ breathes before going to O/C bailout proper. The mouthpiece section has mushroom valves that are Platinum impregnated that CCRB say are the best available on the market as they consider these valves are essential to the correct working of the LSS and we spent the morning stripping this assembly and rebuilding it. The hoses that connect the mouthpiece unit are also a push-fit design and they are locked by plastic retainers and all the push fittings are double ‘O’ ring sealed on machined Delrin.
Following a break for lunch that seemed to be following a trend of very good food being served aboard the MY Tranquillity we spent a couple of hours out on the dive deck assembling our units and that also included filling the scrubber canisters for the first time and I have to say it does take a little practise to nail it and the instructions are written on the side of the scrubber to guide you through the process if needed but once filled the scrubber canister locks into place with a click and the packing springs engage again machined Delrin & stainless steel are the principle materials.
During the afternoon the first group got the chance to give the Sentinel a dive whilst the rest of us continued preparing and adjusting / checking our units for diving tomorrow morning so I hope to have some info about the in water characteristics tomorrow , I have added a few pics from today to hopefully give a feel for a tough enough day that finished this evening with a diving lecture.

Nad · 24th March 2008, 21:05

Great job Barrie, you're still able to write all this stuff after such a hard day?

Thanks.
Cheers to the bunch.

Nad

Mixaddict · 25th March 2008, 03:37

Excellent report. Keep 'em coming!

Ben Field · 25th March 2008, 09:05

Headline- "KISS ADV used in Sentinel" God- I hope they didn't copy it exactly...

Joking aside- great report, thanks Barry. Very interesting stuff.

ch3micaldud3 · 25th March 2008, 10:04

Just Amazing, these live reports...

What is the story about the inflator? Not long enough?

How much lead is being used? (diver-dependent, but still nice to know)

Safe Diving

Ch3micalDud3

Marvintpa · 25th March 2008, 11:27

Excellent write-up Barrie, thanks!

Any issues with the units so far? With so many of them there it's a great environment to test hardware.
Anything about the design causing you concern as a new user?
How well is the single counterlung working out? 4.5l seems... on the small side.
Are the platinum impregnated mushroom valves proprietary?

***Decodiver*** · 25th March 2008, 13:02

Quote: (Originally Posted by ch3micaldud3)

What is the story about the inflator? Not long enough?

The inflator is designed to be worn under the left arm

Cheers,

Dave Cooper.

Mark Chase · 25th March 2008, 15:54

Quote: (Originally Posted by Ben Field)

Headline- "KISS ADV used in Sentinel" God- I hope they didn't copy it exactly...

AMEN

ATB

Mark

Pat Coughlan · 25th March 2008, 20:14

Nice write up Barrie the unit looks impress

ive

Pat

24th March 2008, 14:16	#11 (permalink)
*Decodiver* Administrator Current Rebreather/s: Megalodon Ouroboros rEvo Other CCR Other Rebreather/s: Inspiration Classic Inspiration Vision Evolution Sport Kiss Classic Kiss rEvo Other CCR Join Date: Jan 2005 Location: Geneva Posts: 2,168	Re: Sentinel LSS - Trip Report Quote: (Originally Posted by Frankie Pellegrino) Guys Best of luck with the new toy!! I'm very interested in hearing how your trim is. The counter lung behind your head makes me wonder. Dave 1)Do all the hoses come plastic coated? Is that cover crimped into the brass sleeve or is it just slid over the whole hose? 2) Could you bring your Sentinel to the States in April?? Again Best or luck guys ....I wish I was there playing with your new toy :-) Cheers Frankie Hi Frankie, I think they are Miflex hoses and all are covered with this coating, very flexible though. Miflex Xtreme - Safety When The Pressure's On ! The coating passes under the fitting which is quite long and not like a traditional short crimp. Not sure I am gonna make April yet, will let you know buddy. Cheers, Dave. __________________ CCR/OC Trimix Instructor Trainer CCR Training to Mixed Gas in Switzerland, France, UK & Germany on Megalodon/COPIS-Megalodon/KISS/Sport KISS/Ouroboros/rEvo/Inspiration/Evolution/Sentinel www.zerogravitydiving.com Rebreather World Terms & Conditions
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24th March 2008, 21:05	#13 (permalink)
Nad Rebel to the Bone Current Rebreather/s: Ouroboros Other Rebreather/s: Not Bought Yet Inspiration Classic Join Date: Mar 2005 Location: Europe Posts: 941	Re: Sentinel LSS - Trip Report Great job Barrie, you're still able to write all this stuff after such a hard day? Thanks. Cheers to the bunch. Nad __________________ The Impossible is often the Untried
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25th March 2008, 03:37	#14 (permalink)
Mixaddict Always Learning! Current Rebreather/s: Inspiration Vision Evolution Other CCR Dolphin Other Rebreather/s: Inspiration Classic Other CCR Dolphin Join Date: Jan 2006 Location: Draper, Utah USA Posts: 426	Re: Sentinel LSS - Trip Report Excellent report. Keep 'em coming! __________________ Randy Thornton (MixAddict) Inspiration, Evolution,Hammerhead & Sentinel CCR Instructor
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25th March 2008, 09:05	#15 (permalink)
Ben Field CK+Shearwater Current Rebreather/s: Classic Kiss Other Rebreather/s: Sport Kiss Join Date: Aug 2005 Location: London, England Posts: 1,487	Re: Sentinel LSS - Trip Report Headline- "KISS ADV used in Sentinel" God- I hope they didn't copy it exactly... Joking aside- great report, thanks Barry. Very interesting stuff. __________________ www.hugsac.org.uk Beware Fridge Suck
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25th March 2008, 10:04	#16 (permalink)
ch3micaldud3 New Member Current Rebreather/s: Not Bought Yet Other Rebreather/s: Not Bought Yet Join Date: Nov 2007 Location: Belgium Posts: 8	Re: Sentinel LSS - Trip Report Just Amazing, these live reports... What is the story about the inflator? Not long enough? How much lead is being used? (diver-dependent, but still nice to know) Safe Diving Ch3micalDud3 __________________ I'll be diving a Sentinel this september
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25th March 2008, 11:27	#17 (permalink)
Marvintpa Bad knees, matching brain Current Rebreather/s: Classic Kiss Other Rebreather/s: Join Date: Mar 2005 Location: Ontario, Canada Posts: 233	Re: Sentinel LSS - Trip Report Excellent write-up Barrie, thanks! Any issues with the units so far? With so many of them there it's a great environment to test hardware. Anything about the design causing you concern as a new user? How well is the single counterlung working out? 4.5l seems... on the small side. Are the platinum impregnated mushroom valves proprietary? Last edited by Marvintpa : 25th March 2008 at 11:34.
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25th March 2008, 13:02	#18 (permalink)
*Decodiver* Administrator Current Rebreather/s: Megalodon Ouroboros rEvo Other CCR Other Rebreather/s: Inspiration Classic Inspiration Vision Evolution Sport Kiss Classic Kiss rEvo Other CCR Join Date: Jan 2005 Location: Geneva Posts: 2,168	Re: Sentinel LSS - Trip Report Quote: (Originally Posted by ch3micaldud3) What is the story about the inflator? Not long enough? The inflator is designed to be worn under the left arm Cheers, Dave Cooper. __________________ CCR/OC Trimix Instructor Trainer CCR Training to Mixed Gas in Switzerland, France, UK & Germany on Megalodon/COPIS-Megalodon/KISS/Sport KISS/Ouroboros/rEvo/Inspiration/Evolution/Sentinel www.zerogravitydiving.com Rebreather World Terms & Conditions
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25th March 2008, 15:54	#19 (permalink)
Mark Chase I go down for ages Current Rebreather/s: Classic Kiss Other Rebreather/s: Inspiration Classic Join Date: Jan 2005 Location: Kent Posts: 2,470	Re: Sentinel LSS - Trip Report Quote: (Originally Posted by Ben Field) Headline- "KISS ADV used in Sentinel" God- I hope they didn't copy it exactly... AMEN ATB Mark __________________ Is it supposed to make that noise ? I took my unit to the dive shop and demanded they bolt on every thing that would fit. Join my elite diving teem and get a Tshirt "Doing It Chasey"Hammerhead Eccr Advanced Diving System
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25th March 2008, 20:14	#20 (permalink)
Pat Coughlan New Member Current Rebreather/s: Inspiration Classic Other Rebreather/s: Join Date: Apr 2005 Location: Ireland- County Mayo Posts: 78	Re: Sentinel LSS - Trip Report Nice write up Barrie the unit looks impressive Pat
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