Computer Users: Whats your Max PO2 Setting

[stever2002]

In my Nitrox Class we used 1.4 as a Max PO2 and 1.6 for the Contingency value.

I noticed that my computer defaults to a 1.6 value for the maximum.

What is the SB consensus for this setting - keep it at 1.6 or drop it to 1.4 (or some other value).

...steve...

 

[Divin'Papaw]

I only dive nitrox at 1.4. Ox Tox isn't something to play around with and I want to stay fairly conservative. General industry consensus appears to be that 1.4 is a safer, more conservative option that then leaves upon 1.4-1.6 as a contingency in case you screw up or have an emergency.

 

[Diveral]

1.4, I can't think of a good reason to set it higher.

AL

 

[stever2002]

I see some are answering "Other"; Please let us know what setting you are using, and why. Thanks again,
...steve...

 

[PerroneFord]

For long dives 1.4 is too much. Some that I dive with are diving at 1.0 or 1.1.

 

[Charles R]

1.4 always

 

[Charlie99]

I see some are answering "Other"; Please let us know what setting you are using, and why. Thanks again,
...steve...

What setting ?????

My computer monitors my ppO2 and runs the CNS clock appropriately. It flashes the screen and changes to a display of ppO2 when 1.6ata is reached. At 1.6ata ppO2 the CNS clock reaches 100% in 45 minutes. At 2.0ppO2, the CNS clock reaches 100% in about 8 minutes.

There isn't any sort of user setting. There isn't any audible alarm on either my main computer -- Oceanic Data Plus 2, or the backup -- Oceanic Data Plus.

It's no different than with the decompression tracking. There are no user settings. It simply displays when I go into deco.

 

[Jimmer]

I was the "other" I set mine to 1.5, the reason being I was taught in my ACUC nitrox diver course to plan your dives based on 1.45 PPO2 and I set to 1.5 to keep my overly annoying computer to shut the hell up. Fact of the matter is I never press right to the limit anyway, as all my dives are wrecks with a very solid bottom under them, and I would need a shovel to get to my 1.45 limit. Now if it's going to be very cold or dark, or I anticipate a more challenging or long dive, then I lower my PPO2 accordingly.

 

[do it easy]

I don't use my computer often, but I have a Uwatec Alladin Pro- the default setting is 1.5, but that is just to trigger the alarm. I stay above my MOD, calculated at 1.4.

Also, when I set my nitrox setting (2% increments), I round down the O2 percentage, but when I calculate my MOD, I round up the O2 percentage. For example, if my mix is 31%, I'll set my computer to 30%, but calculate my MOD using 31% (or 32% if I am using tables). This whole process assumes that I only use my computer to track my nitrogen and that I track my MOD in my head. Then again, I don't use my computer very often.

 

[Mark Vlahos]

I leave the computer set to 1.6ATA. I plan my dive to keep within the limit of 1.4ATA and carefully monitor my depth so I do not go to a higher partial pressure.

I leave it set to the higher value because when doing planned decompression profiles I decompress at this higher partial pressure. Please note that the higher value of 1.6 is for the decompression phase of the dive only.

For purely recreational dives I leave the computer set to 1.6ATA and just dive my plan. I am willing to reach the higher partial pressure if there is a compelling reason for me to violate my plan, but it should be because of a decision I have made to violate the plan, and not inattentiveness.

Mark Vlahos