Dive Computer No Deco Computations Question

[tursiops]

Calculated risk of pulmonary and central nervous system oxygen toxicity: a toxicity index derived from the power equation - PMC

The risk of oxygen toxicity has become a prominent issue due to the increasingly widespread administration of hyperbaric oxygen (HBO) therapy, as well as the expansion of diving techniques to include oxygen-enriched gas mixtures and technical ...

www.ncbi.nlm.nih.gov

A few minutes at PPO2=1.8 is probably "safe." Less than 1% chance of toxing.
The like suggests that 15 mins at PPO2=2.0 is the limit for 1% risk of toxiing,. and goes up as the square of the time and the 6.8 [power of the PPO2. So PPO2-2.5 would suggest 7 mins as the limit.

One more citation supporting the Nitrox limits.

Vann RD, Hamilton RW. Central nervous system oxygen toxicity. In: Vann RD, Mitchell SJ, Denoble PJ, Anthony TG, editors. Technical Diving Conference Proceedings; 2008 Jan 18-19. Durham, NC: Divers Alert Network; 2009. p. 38--66.​

Attached.

 

[gordonscuba]

For the record, (and I hope there are dive computer companies listening), I hereby promise that I shall never spend a single dollar towards a dive computer that might lock out under any circumstances. The computer's job is to continuously calculate the Buhlmann model and present the output of those calculations to me in the form of calculated deco plans, NDL plans, SurfGF, GF99 whether on the surface or underwater. If, under certain circumstances, the computer can do that calculation, is functioning as designed, but by design willfully withholds the calculated result, then I shall ensure never to support said computer manufacturer with purchases.

 

[Belzelbub]

For the record, (and I hope there are dive computer companies listening), I hereby promise that I shall never spend a single dollar towards a dive computer that might lock out under any circumstances. The computer's job is to continuously calculate the Buhlmann model and present the output of those calculations to me in the form of calculated deco plans, NDL plans, SurfGF, GF99 whether on the surface or underwater.

Exactly. Same for me. Unfortunately, that really narrows the choices to a few manufacturers currently. Hopefully that will change.