rhephburn3900
Contributor
I keep it at 1.4 unless in really cold water . then fall back to 1.2
To error on the side of safety
R.H.
To error on the side of safety
R.H.
Computer Users: Whats your Max PO2 Setting
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The thing that I find interesting is that most people don't seem to make the leap form just looking at the ppO2 to exposure time.
The following is one of the most interesting pieces I've read on high ppO2 over short periods of time from rebreatherworld.
http://www.rebreatherworld.com/deco...luent-selection-great-alpinist-v-siege-2.html
Maybe a bit much for this forum, but I found it extremely interesting
Bjorn
The following is one of the most interesting pieces I've read on high ppO2 over short periods of time from rebreatherworld.
http://www.rebreatherworld.com/deco...luent-selection-great-alpinist-v-siege-2.html
Maybe a bit much for this forum, but I found it extremely interesting
Bjorn
Bjorn, which post(s) are you referring to?
Probably why most people don't look at exposure time is because in most OC diving, even with profiles requiring deco, exposure time won't be much of a concern to anyone but the chamber team. It's rare that you'll reach a maximum exposure time diving to recreational limits or even basic decompression limits. I track my exposure time when doing deeper dives, but even then, I've rarely come even close to maxing it out.
Probably why most people don't look at exposure time is because in most OC diving, even with profiles requiring deco, exposure time won't be much of a concern to anyone but the chamber team. It's rare that you'll reach a maximum exposure time diving to recreational limits or even basic decompression limits. I track my exposure time when doing deeper dives, but even then, I've rarely come even close to maxing it out.
Rob: I think pretty much all of them
I think I have 2 issues with that way of thinking expressed in this thread:
1) It implies that people are letting a computer control their dive.
I used to do exactly what people here did, which is to say that I'll just set this conservative hard ppO2 limit and that's it. But then as I read more and tried to understand more, I started to realize just how much more there is to it than is discussed in the Nitrox course
If you get a chance, read the posts on rebreatherworld, I took much away from the discussion and it made me critically evaluate some assumptions I'd made
Heck, maybe I'm just slow and everyone else has already worked it all out.
Must run, going diving (at a ppO2 of something like 0.6
)
Dive safe.
Bjorn
I think I have 2 issues with that way of thinking expressed in this thread:
1) It implies that people are letting a computer control their dive.
I think that it's excellent not to push to 1.4 given the large variance in O2 exposure limits, but why not just work out a max depth using some tables and _know_ the other criteria?
2) If you read through the link I posted, high ppO2 exposures early in the dive and for short times seem to have very few ill effects.I think this is key, for instance, what if someones buddy has an issue at the beginning of a dive and blows a max depth based on ppO2? What will drive someones decision to go after their buddy if it means a ppO2 of 1.8? Or 2.0? And it's early in the dive? I think that these type of things are important to think about, which is why I posed the link in my previous thread
I used to do exactly what people here did, which is to say that I'll just set this conservative hard ppO2 limit and that's it. But then as I read more and tried to understand more, I started to realize just how much more there is to it than is discussed in the Nitrox course
If you get a chance, read the posts on rebreatherworld, I took much away from the discussion and it made me critically evaluate some assumptions I'd made
Heck, maybe I'm just slow and everyone else has already worked it all out.
Must run, going diving (at a ppO2 of something like 0.6
)Dive safe.
Bjorn
Sorry, I meant which post on RBW.
I agree that it appears that many people let computers dictate their profile, which isn't a good thing. But the OP was asking what settings to leave his computer set at. Nothing more or less. Many computers don't give you an option of anything but 1.4 or 1.6. I agree, pushing the limits isn't a smart thing. I will dive 1.6 when doing deco, but if it's the working part of the dive, I'm usually a little on the lower side.
I don't dive CCR or SCR, but from what I understand, it is more of a concern there because you're diving the best mix for every depth so it's necessary to keep track of exposure time. Just like when diving trimix at deeper depths it's necessary to keep track of exposure time. For basic recreational nitrox, I'm not seeing it as a big necessity. I do teach it in my nitrox classes, and I teach proper planning of dives, but I think what's being discussed in RBW is more than the OP was looking for.
I agree that it appears that many people let computers dictate their profile, which isn't a good thing. But the OP was asking what settings to leave his computer set at. Nothing more or less. Many computers don't give you an option of anything but 1.4 or 1.6. I agree, pushing the limits isn't a smart thing. I will dive 1.6 when doing deco, but if it's the working part of the dive, I'm usually a little on the lower side.
I don't dive CCR or SCR, but from what I understand, it is more of a concern there because you're diving the best mix for every depth so it's necessary to keep track of exposure time. Just like when diving trimix at deeper depths it's necessary to keep track of exposure time. For basic recreational nitrox, I'm not seeing it as a big necessity. I do teach it in my nitrox classes, and I teach proper planning of dives, but I think what's being discussed in RBW is more than the OP was looking for.
Rob: You made me go through typing all that out and just wanted to know which post? hollly Jeeebus!
In all seriousness, the RBW post is worth reading in it's entirety IMO. Then again I didn't (don't) know much about rebreathers and found the whole discussion fascinating
I agree that it's more than what the OP was looking for. But then, did you read my sig?
Bjorn
In all seriousness, the RBW post is worth reading in it's entirety IMO. Then again I didn't (don't) know much about rebreathers and found the whole discussion fascinating
I agree that it's more than what the OP was looking for. But then, did you read my sig?
Bjorn
douglasville diver
Contributor
O.K. I love learning,so @ a 1.6 on ean 28 max depth 137, whats my total dive time and how long @ depth do I have before mandtory deco, if I violate no deco then what would my deco be?
douglasville diver:
You want a response beyond the fact that your second part of the question can't be answered because you didn't supply the necessary information?
Plus, who told you to go to 1.6 and stay there? I would stop listening to them...
For the first part of your question, I'd recommend taking a Nitrox course. The teach that stuff ya know
matt_unique
Guest
1.4 pp02 for working gas
1.6 pp02 for deco gas
--Matt
1.6 pp02 for deco gas
--Matt
I have my computer set for 1.6 with a warning alarm at 1.4 ... Of course I check with my computer often..
Remember both 1.4 and 1.6 are safe numbers for the "average diver" Most divers will have no problem with a MAX 1.6 as long as they don't MAX out every dive....You have to use some common sense...if you pop a 1.5 and start to feel funny you need to ascent until your PO2 drops.... I've even had a diver who was O2 sensitive and claimed to feel twitchy at a 1.4 so he never goes higher then a 1.3 now....THIS IS WHY you learn the signs of Oxygen TOXICITY in EAN Class.
Remember both 1.4 and 1.6 are safe numbers for the "average diver" Most divers will have no problem with a MAX 1.6 as long as they don't MAX out every dive....You have to use some common sense...if you pop a 1.5 and start to feel funny you need to ascent until your PO2 drops.... I've even had a diver who was O2 sensitive and claimed to feel twitchy at a 1.4 so he never goes higher then a 1.3 now....THIS IS WHY you learn the signs of Oxygen TOXICITY in EAN Class.
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