Eric:

Right you are. I'll blame jet lag. It's at the beginning for just that
reason.

Ray Warshaw


"Eric Greenwell" wrote in message
...
Raphael Warshaw wrote:
Eric:

A demand system delivers gas in response to inspiratory effort. By
this definition, the EDS is a demand system.

That's what I thought, also, but I was confused by your remark that
"demand systems using masks is that they supply a full breath of 100%
O2, not just a pulse".

The EDS attempts to
deliver it's pulse of oxygen after the dead-space has been cleared.

According to my EDS manual (original model EDS), it delivers a pulse the
instant the start of inhalation is detected. This is a key part of their
claim for effectiveness, because this adds the 100% oxygen pulse to
first part of the air intake, which is the part that will go the deepest
into the lungs. Delivering it later might mean it ended up in the
dead-space, wouldn't it?


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Eric Greenwell
Washington State
USA