What's the diff...

[Toadie]

So I'm using my computer and I read in the instruction book that I can't jump between nitrox dives and air dives... but I can set an air dive to nitrox 21%. I have to ask... what's the diff?

I mean, if you set it to air or nitrox at 21%..... am I missing something?


The book says.... Once a dive is made with the unit set as a nitrox computer the unit cannot be programmed to operate as an Air computer until 24 hours after the last dive.

 

[Mako Mark]

nitrox 21 = air

no diff

 

[JeffG]

So I'm using my computer and I read in the instruction book that I can't jump between nitrox dives and air dives... but I can set an air dive to nitrox 21%. I have to ask... what's the diff?

I mean, if you set it to air or nitrox at 21%..... am I missing something?


The book says.... Once a dive is made with the unit set as a nitrox computer the unit cannot be programmed to operate as an Air computer until 24 hours after the last dive.

The diff is that your computer is handling the two different cases differently...even though there is no real physical difference. (My guess would be the CNS tracking)

 

[herman]

I think what you are missing is O2 loading.
My computer does not keep up with O2 in air mode but it does in Nitrox mode. If you swapped between the 2, you would cause O2 loading calcs to be off. Not allowing your to swap keeps you from effecting the calcs. If you call air "nitrox 21" the computer keeps the O2 calcs correct.

 

[pete340]

So I'm using my computer and I read in the instruction book that I can't jump between nitrox dives and air dives... but I can set an air dive to nitrox 21%. I have to ask... what's the diff?

For Nitrox, computers usually track O2 exposure and have an MOD alert. For air they don't.

 

[Mo2vation]

I think what you are missing is O2 loading.
My computer does not keep up with O2 in air mode but it does in Nitrox mode. If you swapped between the 2, you would cause O2 loading calcs to be off. Not allowing your to swap keeps you from effecting the calcs. If you call air "nitrox 21" the computer keeps the O2 calcs correct.

In "Air" mode, my Vytec is tracking (and reporting) nitrogen loading.

In "Nitrox 21%" its tracking and reporting O2 loading?

Thanks

---
Ken

 

[skeet]

Oxygen exposure tracking for 24 hour period which mine doesn't do in the compressed air mode instead it goes by nitrogen loading.

 

[FatCat]

In "Air" mode, my Vytec is tracking (and reporting) nitrogen loading.

In "Nitrox 21%" its tracking and reporting O2 loading?

Thanks

---
Ken

I never bother to take my Cobra off Nitrox setting. I've noticed that it keeps tracking OTU and MOD at Nitrox 21.

I've no problem with that.

 

[jbisjim]

Oxygen exposure tracking for 24 hour period which mine doesn't do in the compressed air mode instead it goes by nitrogen loading.

Correct as in any table it takes 24 hours to clear you from any dive cycle you are doing. Flying, Nitrox

My computer will say Nitrox unit a 24 hour period of no diving, has lasped. I dove Nitrox in the middile of my dive trip, last week, and My computer said Nitrox on it till the end of the trip since i was diving in less than 24 hours anyway. As stated above set it to 21 and get wet. In the Nitrox mode it track both your o2 clock and your N clock.

 

[rab]

And... for my Suunto Mosquito at least, the O2% defaults to 21% after two hours. For a repetitive series of dives, the setting is likely to remain, but you'll always have to set the EAN value for at least your first dive of the day. If you are diving EAN, then it's a good habit to check/set the value before every dive.

-Rob