O2 Injection???

Micko

Ok i have tried the o2 injection on the inhalation lung and for the life of me i still do not see the benifit of it on this lung.
From my personal exp i have found that injection on the exhale lung seems to be more easy to maintain a constant setpoint when using the unit manual.

I think this thread has been discussed before however i would like to see what others are doing???
And what others seem to think of the positives verse negatives of each method?

Jim

Personally, I have no problems with the O2 inject on the inhale lung - holding a constant set point while operating the unit manually. Several Meg owners (including me) exhale into the loop at the time of addition of O2 to provide aditional volume to the loop to aid the mix of the gas.

I do feel that manual addition on the inhale lung is NOT for the heavy handed and would suggest the diver avoid long hard pushes on the button for obvious reasons - however I have been diving the unit for a while now with dives ranging from 35m to 80m / 2h to 3hours duration with no problems.

Bearing in mind the unit's designer and background (military) the idea of O2 on the inhale side was to provide a quick O2 fix to the diver in case of CO2 hit - I am no engineer/gas expert/professor and will not try and validate this argument and obviously O2 at depth carries it's own issues, but that said I love the unit - it has kept me alive through some very hairy boat trips and dives when other units have fallen by the wayside. I'll be sticking with it the way it was designed by a much more qualified chap. I look forward to the debate !!

Cheers and safe diving.

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Jim Spence

MikeH

I don't have a problem with the O2 manual add being on the inhalation lung....I just trained myself from day 1 on the unit to exhale as I'm manually adding O2 so as not to get pure O2 at depth. I've got probably close to 100 hours on my unit now, at depths up to 270ft, with no problems with this procedure.

Mike

JonnyB

I was also told to exhale when adding O2 and then i was also tought not to add too much.
But i wonder how you do when you add and exhale, do you do it simultaniously, do you add and wait a few seconds adn then exhale...?

/Jonny

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trob09

I've been plugging the O2 hose into the exhalation counterlung for a while now and am very pleased with the results. I find it much easier to manage the PO2 of the loop this way (I dive manual control 95% of the time) and use less O2 and dil during dives.

I dove as others have described for the first 100 hours or so on my unit but always felt a bit nervous when hitting the O2 add button at depth.

I know others who have done this as well and agree with my observations.

T

MikeH

When I need to add O2, I do it just as I'm beginning to exhale. I exhale a full breath(and don't add too much O2 at once, never more than 1 second burst unless I'm at or shallower than 20ft/6m). Just by moving that much volume of gas through the loop it will push a bunch of gas into the inhale lung for the O2 to mix with, and likely even pull it through the DSV and into the exhale lung due to the pressure differential.

When I first started diving the Meg I had to make a conscious effort to make sure I wasn't inhaling when adding O2, but after a few hours it became automatic.

If you don't trust this method...you have a couple choices. Let the solenoid control the PO2(because it mixes in with the rest of the gas long before it gets to the DSV) or connect your O2 feed to the exhale lung.

Mike