I300c switching between EAN and Air

[Kevin Floyd]

i feel like this is a stupid question because I have to believe that there is an easy answer And I am just missing it.... how do you switch back from EAN to Air? On a recent dive I had an issue with my EAN cylinder out on the dive site, because my buddy and I were the only 2 on the boat diving on EAN the only extra tanks were air. This was the 3rd and last dive of the day. When I couldn’t get it figured out I just changed my O2 to 21 and did the dive. But there has to be a more simple way. I have read the owners manual and couldn’t find any help.

 

[JackD342]

Well, I was going to paste a link to the manual and tell you what page the info was on, but I just looked through the whole document and couldn’t find it!

I am pretty sure that setting the mix to 21% is your only option - that is pretty common. Also pretty sure that 24 hours after your last dive the unit will revert to Air.

 

[northernone]

Well, I was going to paste a link to the manual and tell you what page the info was on, but I just looked through the whole document and couldn’t find it!

I am pretty sure that setting the mix to 21% is your only option - that is pretty common. Also pretty sure that 24 hours after your last dive the unit will revert to Air.

That's my experience when trying to help a random diver with his i300. Leave it on EAN and set 21% is a good solution.

 

[JackD342]

Check page 14 for this old Aeris A300 manual. I think that is the verbiage omitted from the current i300c manual.
http://www.dive-computer-wizard.com/manuals/Aeris_A300_dive_computer.pdf

 

[JackD342]

Ha!
Better yet, It was on page of the i300 manual. Got lost when they added the Bluetooth feature and switched to i300c.
http://www.aqualung.com/ca/technical_library/i300_owners_manual_EN.pdf

 

[Kevin Floyd]

Thanks for the info. I would have never thought to look in the i300 book. I wonder why they don’t allow switching. In my case not only did my 3rd tank have a slow leak but the fill station didn’t get O2 today so I might have to go on air for a couple of days. Why force a 24 hour wait to change gases? I won’t have 24 hours between dives till I stop diving to fly.

 

[JackD342]

To my recollection, that has always been the Pellagic approach. If you change it to 21% O2, what difference does that make?

More important is knowing what happens on repetitive dives. Does it assume the previous mix, or does it require you to enter a new mix for each dive? I don’t know if it is still common or not, but if it wants a new mix entered for each dive, failing to do so would default to an impossible mix of 50% O2 and 79% N out of abundance of caution. That behavior can also be a configurable option on some models.

In that case, I would assume the thinking is that if you use EAN on a trip, you are likely to do so more than once, and it wants to make it harder to accidentally exceed an EAN pp limit.