> On Friday, June 27, 2003 8:45 AM, Mike Wallace wrote:
>
> Lee said
> > > Having said all of that, I'm not sure why you would say there was a
> > > lack of O2 due to no dilutent.  While dilutent would seem to add some
> > > O2, so does the O2 portion of the system.  What did I get wrong and
> > > how wrong did I get it?
>
> > You are using a portion of the O2 in the loop with each breath. This used
> O2 must be
> > replaced or you will eventually use all the O2 in the loop. In the Dolphin
> breather, the
> > supply gas is Nitrox. Once the supply bottle is empty, if you continue to
> breathe the
> > loop gas you will eventually use the O2 to a point that it will not
> sustain life.
>
> G'Day, Mike!  An excellent way to bring that home - especially to divers
> used to open-circuit who know when they're out of gas because they start
> "sucking on lemons" - is to stay snug and warm in the shop and plumb a
> cylinder of air into the rebreather.  There's no difficulty in inflating the
> lungs, but after a very few breaths - and while you watch the O2 sensor drop
> towards single digits - the onset of oxygen deprivation is really quite
> alarming in the suddeness of the symptoms.  :-)

Did that myself just to see what was up with the breathing loop once. It
definitely shows you that the breather is not really a simple little piece of
equipment. It'll kill you in  a very short time if you are not very careful.

>
> Strike


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Mike Wallace
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