I would think the PPO2 would be a bigger factor than the O2 percentage to reduce fatigue. At 10m (33ft) on air you still breathe 21% oxygen, but at twice the pressure. So you're getting twice as much oxygen in your lungs than on the surface, or a PPO2 of .42 rather than .21. Of course a higher O2 percentage also increases your PPO2, so EANx 32 would give you a PPO2 of .64 at 10m deep.
Watched few of your videos. I wish TDI/SDI courses would be written by you, that's how easy for me to understand the scuba subject (I am foreigner and just a beginner that started scuba at 51 years old). Huge THANK YOU!
Ha, I love it. A great sport to join as you age. No stress on the joints and it is so wonderful to be weightless. Very kind words, thank you. More to come soon. Freddy
Great Videos I just recently discovered the channel. I agree with all of what you said about Nitrox being safer. However to the point of diving with your computer set to air. Aren't you diving a little bit more conservatively? From the standpoint that you have a longer surface interval so you allow your body to off-gas more.
Michael, thanks for the questions. I do cover that in detail in the video but here is the general answer. No! how's that for short. It will falsely give you an oxygen saturation level. It will not warn you as you are approaching Nitrox depth limits. Now, if your computer is set for 32% Oxygen and you only get 30.8% then leaving your computer on 32% setting is more conservative. Your computer thinks your depth limit is 110 feet at 32%. When in reality your depth limit is say for example, 118 feet at 30.8%. Your computer warns you as if it is 32% as you approach 110 feet. As far as surface interval goes, once you have reached your safe time on the surface you are good to go. The computers are conservative, the tables are conservative. So, if it tells you, you are safe, you can count on it. The more important part of the data you need for safety in these examples is your depth at time rather than surface interval. So properly setting your computer to the oxygen level you are diving is better than leaving it on air at 21%. I personally don't micro adjust in the case that I receive a slight variation of the gas. As per my example of diving 32% but only getting something close like 31%.
Awesome content. I had that crazy covid last year. My lung Dr advised me to get my nitrox certification for the oxygen. Because covid put a hurt on my lungs 😢
I understand that. My son has asthsma and Nitrox is a game changer for him. Glad you made it through the Covid and still diving. Thanks so much for watching. More to come soon, Freddy.
great history lesson. i always thought cousteau invented diving. i think you almost need a clone of yourself to appreciate the difference i usually dive it because its free or on a liveaboard but i'm sure they'll hit a price point where i wouldn't can you use the same tank to fill with air one day and nitrox the next why did they settle on 32% as a standard.
I know its a bit late, but yes you can dive the same tank on nitrox and air. Your dive center should be able to drain or even vacuum the air out of your tank and fill it with whatever gas you need. And 32% nitrox gives you the greatest range of depth while still retaining the benefits of extending your dives
Yes Brian. You must first get your open water certification. A pre-requisite for Nitrox. But once a certified diver you can take the Nitrox course. The #1 specialty course for any agency. Thanks for participating. More to come soon. Freddy
Hey Mike, no need to do nitrox at all, because you will not notice any benefit at 25% simply because normal air is 21%. Regular air is safer at depth. If you are going to do it anyway then 140' is safe at 25%. And I would never dive on 100% oxygen. Just saying. Keep it safe. Freddy
@@LeviathanScuba 25% @ 140 gives you a little more ndl but trimix would be best. 25-26% would be best mix Why would you not reduce your surface interval and increase off gassing by switching to o2 @20’? I Stage the o2 @20’ and carry a 40cuft with air for bailout
You are correct and obviously a knowledgeable diver. It would work for sure. But, personally, given the differences all us humans have in our anatomy, I believe in being a bit extra cautious with the time portion of the safety stop. It is not just the O2 that helps you after depth. It is the suspended Nitrogen in the blood stream that circulates and is eliminated in the lungs. So, your O2 might be extra good at 100% however for your blood to circulate from all those small areas of the body through the lungs still takes a bit of time. Think that most people are not suffering a lack of oxygen. But a build up of Nitrogen that is the danger. Reduced surface interval is always a good thing if it is safe. Thanks for your comments. Take care. Freddy
