----- Original Message -----
From: "J.M. Vitoux" <[log in to unmask]>
To: <[log in to unmask]>
Sent: Monday, January 07, 2002 09:21
Subject: Re: [SCUBA-SE] Call Me Old Fashioned


> Steven Catron wrote:
>
> > ----- Original Message -----
> > From: "Bjorn Vang Jensen" <[log in to unmask]>
> > To: <[log in to unmask]>
> > Sent: Monday, January 07, 2002 02:31
> > Subject: Re: [SCUBA-SE] Call Me Old Fashioned
> >
> > > > One computer sets itself to a mix that totals more than 100 ???
Why ?
> > Sounds like the when computer doesn't know if you're using nitrox or
air
> > on a subsequent dive, it goes to the most conservative defaults (i.e.
> > nitrogen for air, oxygen exposure for nitrox)
> >
> > > >
> > > > - And why is 50% oxygen more conservative ?
> > In terms of oxygen exposure, wouldn't using the highest 02 setting be
the
> > most
> > conservative?
>
> In terms of O2 Toxicity yes. In terms on nitrogen loading definitely
not.
Right.  Ergo the nitrogen = 79% co-default.

> Your remark had me re-read Lee's post under a new light. If indeed, the
> computer by default sets Oxygen = 50% to track O2 toxicity/exposure and
at
> the same time Nitrogen = 79% (obviously a fictive mix) to track loading,
it
> results in the most conservative model (assuming that 50% is the maximum
> setting).
That's what I was trying to express.  :-)

Steven

Steven