oxygen toxicity calculator

[Basking Ridge Diver]

My spreadsheet is metric and not imperial. I'll add an excel convert function and republish a bit later.

Apologies - I did not realize - it only mentioned Depth - I should have realized by your profile.

 

[PCoetzee]

Hey!

It seems I cannot upload files directly anymore... I get some kind of error.
If you are still interested in my spreadsheet send me a direct msg.

Regards

 

[rjack321]

1.3 half times should be calculated by 0.5 to the power of 1.3. By the method above two half times would leave no CNS rather than the actual quarter.
0.5 ^ 1.3 = 0.41 so 41% remaining.
Typically it is taught to only consider whole half times which avoids the fractional powers.

Yes but I was trying to show how you could get "close enough" on the back of a boat in wetnote scribbles. Since the OP doesn't seem to know how to roughly estimate their exposures and give an estimate across multiple dives on a day (100% is hard to hit on OC)

 

[EFX]

There are spreadsheets for just about everything. Does anyone have one for tracking/calculating oxygen toxicity?
just curious. thanx

I'm working on it. I've added the pulmonary oxtox to my tissue compartment calculator which BTW is a spreadsheet. I haven't posted this version yet because I want to include the CNS calcs which I am working on now.

Bigd2722, download this spreadsheet to calculate your OxTox.

 

[boulderjohn]

To add to what RJP said earlier, I've (for fun) tried using the PADI Nitrox tables to see if I can construct an NDL dive series on 32% or 36% that will hit the oxtox limits. I can sort of get there using 36%, but cannot with 32%. I was doing things like NDL dives to the MOD for 36%, normal surface intervals, then doing it again. So on dive one to 90 ft for 40 mins you pick up 30%; 1h SI lets the next 90 ft dive be for only 21 mins, so you only pick up 15% on that dive. So 3 more 21 min dives to 90 ft, with a 1h SI in between, gives another 45%, for 90% total. So, using 36%, 5 consecutive dives to 90 ft, all to max NDL, and 1h surface intervals, gets me to 90%.

Doing the same strategy with 32%, first dive is to 110 ft for 25 mins, giving 20% O2. 1h SI, second dive can only be to 110 ft for 13 mins, giving 10% O2. 7 more NDL dives like that and I'm at 100%, but I had to do 10 dives totalling 142 minutes BT plus 9h of SIs, for a LONG day!

When I took the PADI nitrox course years ago, the final exam was 50 questions with a whole lot of math. You had to be able to determine the limiting factor of your planned dives, much as Tursiops did as I quoted above. All of those questions disappeared from the course. It is barely mentioned now. I assume that is because everyone eventually realized what I did when I took the test--when on Earth will I ever see a dive day like that?

The PADI Tech program spends a lot of time teaching how to plan these oxygen limits for technical dives. They give you a slate on which you place the values obtained from a set of tables. You add up the numbers. It would be fairly easy to set that up as a spreadsheet, depending upon how much of it you want to make automatic. I assume not many people do that because pretty much all technical diving software already does that.