Would an integrated O2 tank pressure monitor be safer?

Gilles · 19th March 2008, 09:17

The answer about what is safer is in the e versus m CCR accident statistics

.

***caveseeker7*** · 19th March 2008, 09:33

Not necessarily, Gilles.

I do vaguely remember some guy with a SC rebreather who had a fatal accident in a pool. IIRC he was found sitting at the bottom with his tank depleted ... .

While this was a SC unit the "leaky valve" technology is quite similar, and had he watched either his pO2 (don't remember if he had a pO2 monitor installed or not) or his contents gauge he may well still be alive. A warning system could have alerted him to do just that.

But it does to quite some extend go back to the manual vs electronic discussion and the need to know your pO2 and not be(come) complacent.

Stuart and Dave have it right IMHO, no matter what or how many systems you have available, you need to monitor and stay on top of them.

Doesn't really matter if that's a simple, little Sport Kiss or Dolphin, a mighty Ouroboros or an ingenious Cis-Lunar.

laurawood · 24th March 2008, 18:06

I just added a wrist mounting to my oxygen gauge on my inspiration. When I was on open circuit I took one of the small gauges and added one of the old suunto dive compass straps under the rubber gauge cover and used a clear tie wrap to hold it in place. This now works great on the oxygen pressure gauge. It makes it that much easier to check O2 during the dive.

Marvintpa · 24th March 2008, 20:00

I'm under the impression the Sentinel even takes this idea of monitoring pressure one step further and will tell you if you are nearing a point where you don't have enough gas to return from the depth you're at, rather than just an arbitrary alarm at 50 BAR.

Drmike · 25th March 2008, 07:30

Quote: (Originally Posted by Mark Chase)

I can see an advantage in a Diluient presure sensor because that can run out without you noticing but whats the ponint of an 02 sensor? If your going to be oblivious to PP02 drop wont you be oblivious to 02 presure drop?

Dosent a PP02 alarm do the same thing?

ATB

Mark

Mark, If your doing a deep or long cave dive and have a small O2 leak you can lose all your small O2 supply quite quickly. Usually the bail O2 is staged so you dont have back up. You can end up in a situation where you dont have enough O2 to maintain setpoint and get back to 6m and complete deco. [yes opf course you can run semiclosed and you can even bail to OC - but I dont want to, it adds risk and adds stress and is less comfortable on a long dive. So yes I think O2 sensor is very important - in fact Id say more important than a dil sensor seeing as you can plug in bail gas for dil (and so you have much more dil gas available than O2). If you use ppo2 drop to indicate your losing O2 it wont do you much good as you would have already lost it all by time poo2 drops lol!

Boris/sentinel will alert you if your O2 or dil consumption rate is abnormally high (ie you have a leak somewhere. this is also useful as part of predive tests uses accurate digital gas pressure displays to see if theres the slightest leak) and it will alert you when you are down to 50bar

I hate spgs on rbs - I took mine off my inspiration and off my MK15.5. Losing nearly all my O2 sub 150m in a cave due to a small o-ring leak before I realised and had a very unconfortable (from stress perspective) ascent and deco not knowing if my O2 was going to run out any min and having to pick up and carry/switch each staged bail tank (to get access to higher FO2) during ascent - taught me that knowing your contents just makes sense. I put them back on the MK15.5 but tucked them out the way. Now on Boris I love the digital pressure sensors as there is no down side (no danglies) and it works great. It just helps reduce the stress of not knowing - when you have doubt and the excessive usage alarm is a very nice feature to have too.

I dont know what sensor boris/sentinel uses but so far its been 100% reliable and I know kevin denlay has been using digital gauges for yonks on his MK15.5 too with AFAIK no problems so not sure I buy the reliebility concerns.

Drmike · 25th March 2008, 07:40

Quote: (Originally Posted by Gilles)

The answer about what is safer is in the e versus m CCR accident statistics

.

will mccr diving make my willy bigger too?

Gilles · 25th March 2008, 07:59

Quote: (Originally Posted by Drmike)

will mccr diving make my willy bigger too?

I suppose if that's what you need it for, then go for it. Might be cheaper though, to just go visit Orchard Towers.

Drmike · 25th March 2008, 08:11

Quote: (Originally Posted by Gilles)

I suppose if that's what you need it for, then go for it. Might be cheaper though, to just go visit Orchard Towers.

and rent one?

Gilles · 25th March 2008, 08:18

Quote: (Originally Posted by Drmike)

and rent one?

or two or three even.

19th March 2008, 09:17	#21 (permalink)
Gilles Worship the feminine Current Rebreather/s: Megalodon Other Rebreather/s: Join Date: Sep 2005 Location: Den Haag (Netherlands) Posts: 761	Re: Would an integrated O2 tank pressure monitor be safer? The answer about what is safer is in the e versus m CCR accident statistics. __________________ Gilles http://www.dirrebreather.com
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19th March 2008, 09:33	#22 (permalink)
*caveseeker7* Who loves ya, baby Current Rebreather/s: Sport Kiss Other Rebreather/s: Prism Topaz Join Date: Jan 2005 Location: Too far from Neverland Posts: 5,325	Not necessarily, Gilles. I do vaguely remember some guy with a SC rebreather who had a fatal accident in a pool. IIRC he was found sitting at the bottom with his tank depleted ... . While this was a SC unit the "leaky valve" technology is quite similar, and had he watched either his pO2 (don't remember if he had a pO2 monitor installed or not) or his contents gauge he may well still be alive. A warning system could have alerted him to do just that. But it does to quite some extend go back to the manual vs electronic discussion and the need to know your pO2 and not be(come) complacent. Stuart and Dave have it right IMHO, no matter what or how many systems you have available, you need to monitor and stay on top of them. Doesn't really matter if that's a simple, little Sport Kiss or Dolphin, a mighty Ouroboros or an ingenious Cis-Lunar. __________________ Cheers Stefan "It is still a good day if you are on the green side of the grass! Su amigo Roberto!" Sponsor Lou in Race For Life!
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24th March 2008, 18:06	#23 (permalink)
laurawood New Member Current Rebreather/s: Inspiration Classic Other Rebreather/s: Join Date: Mar 2007 Location: Dorset Posts: 8	Re: Would an integrated O2 tank pressure monitor be safer? I just added a wrist mounting to my oxygen gauge on my inspiration. When I was on open circuit I took one of the small gauges and added one of the old suunto dive compass straps under the rubber gauge cover and used a clear tie wrap to hold it in place. This now works great on the oxygen pressure gauge. It makes it that much easier to check O2 during the dive.
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24th March 2008, 20:00	#24 (permalink)
Marvintpa Bad knees, matching brain Current Rebreather/s: Classic Kiss Other Rebreather/s: Join Date: Mar 2005 Location: Ontario, Canada Posts: 233	Re: Would an integrated O2 tank pressure monitor be safer? I'm under the impression the Sentinel even takes this idea of monitoring pressure one step further and will tell you if you are nearing a point where you don't have enough gas to return from the depth you're at, rather than just an arbitrary alarm at 50 BAR.
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25th March 2008, 07:30	#25 (permalink)
Drmike Custom Title Allowed! Current Rebreather/s: MK 15.X Ouroboros Other CCR Home Build Other Rebreather/s: Inspiration Classic Other CCR Home Build Join Date: Feb 2005 Posts: 3,128	Re: Would an integrated O2 tank pressure monitor be safer? Quote: (Originally Posted by Mark Chase) I can see an advantage in a Diluient presure sensor because that can run out without you noticing but whats the ponint of an 02 sensor? If your going to be oblivious to PP02 drop wont you be oblivious to 02 presure drop? Dosent a PP02 alarm do the same thing? ATB Mark Mark, If your doing a deep or long cave dive and have a small O2 leak you can lose all your small O2 supply quite quickly. Usually the bail O2 is staged so you dont have back up. You can end up in a situation where you dont have enough O2 to maintain setpoint and get back to 6m and complete deco. [yes opf course you can run semiclosed and you can even bail to OC - but I dont want to, it adds risk and adds stress and is less comfortable on a long dive. So yes I think O2 sensor is very important - in fact Id say more important than a dil sensor seeing as you can plug in bail gas for dil (and so you have much more dil gas available than O2). If you use ppo2 drop to indicate your losing O2 it wont do you much good as you would have already lost it all by time poo2 drops lol! Boris/sentinel will alert you if your O2 or dil consumption rate is abnormally high (ie you have a leak somewhere. this is also useful as part of predive tests uses accurate digital gas pressure displays to see if theres the slightest leak) and it will alert you when you are down to 50bar I hate spgs on rbs - I took mine off my inspiration and off my MK15.5. Losing nearly all my O2 sub 150m in a cave due to a small o-ring leak before I realised and had a very unconfortable (from stress perspective) ascent and deco not knowing if my O2 was going to run out any min and having to pick up and carry/switch each staged bail tank (to get access to higher FO2) during ascent - taught me that knowing your contents just makes sense. I put them back on the MK15.5 but tucked them out the way. Now on Boris I love the digital pressure sensors as there is no down side (no danglies) and it works great. It just helps reduce the stress of not knowing - when you have doubt and the excessive usage alarm is a very nice feature to have too. I dont know what sensor boris/sentinel uses but so far its been 100% reliable and I know kevin denlay has been using digital gauges for yonks on his MK15.5 too with AFAIK no problems so not sure I buy the reliebility concerns. __________________ Get a girlfriend you sad twat - a Rebreather is an unfaithful mistress - dont blind yourself to her faults just because she goes down on you Last edited by Drmike : 25th March 2008 at 07:54.
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25th March 2008, 07:40	#26 (permalink)
Drmike Custom Title Allowed! Current Rebreather/s: MK 15.X Ouroboros Other CCR Home Build Other Rebreather/s: Inspiration Classic Other CCR Home Build Join Date: Feb 2005 Posts: 3,128	Re: Would an integrated O2 tank pressure monitor be safer? Quote: (Originally Posted by Gilles) The answer about what is safer is in the e versus m CCR accident statistics. will mccr diving make my willy bigger too? __________________ Get a girlfriend you sad twat - a Rebreather is an unfaithful mistress - dont blind yourself to her faults just because she goes down on you
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25th March 2008, 07:59	#27 (permalink)
Gilles Worship the feminine Current Rebreather/s: Megalodon Other Rebreather/s: Join Date: Sep 2005 Location: Den Haag (Netherlands) Posts: 761	Re: Would an integrated O2 tank pressure monitor be safer? Quote: (Originally Posted by Drmike) will mccr diving make my willy bigger too? I suppose if that's what you need it for, then go for it. Might be cheaper though, to just go visit Orchard Towers. __________________ Gilles http://www.dirrebreather.com
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25th March 2008, 08:11	#28 (permalink)
Drmike Custom Title Allowed! Current Rebreather/s: MK 15.X Ouroboros Other CCR Home Build Other Rebreather/s: Inspiration Classic Other CCR Home Build Join Date: Feb 2005 Posts: 3,128	Re: Would an integrated O2 tank pressure monitor be safer? Quote: (Originally Posted by Gilles) I suppose if that's what you need it for, then go for it. Might be cheaper though, to just go visit Orchard Towers. and rent one? __________________ Get a girlfriend you sad twat - a Rebreather is an unfaithful mistress - dont blind yourself to her faults just because she goes down on you
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25th March 2008, 08:18	#29 (permalink)
Gilles Worship the feminine Current Rebreather/s: Megalodon Other Rebreather/s: Join Date: Sep 2005 Location: Den Haag (Netherlands) Posts: 761	Re: Would an integrated O2 tank pressure monitor be safer? Quote: (Originally Posted by Drmike) and rent one? or two or three even. __________________ Gilles http://www.dirrebreather.com
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