Performance; Work Of Breathing; Breathing Curve - POSEIDON Xstream Series Service Manual

8. TECHNiCal DaTa

Performance

Work of breathing

The diagram to the right show a calculated
graph for Work of Breathing in Joules/litre
at Q =62.5 litres/min. The equation
average
behind it, is extracted from hundreds
of tests, from which coefficients for gas
dependency, average flow dependency,
and depth dependency is calculated.
Its maximum inaccuracy is within +/- 10%
The equation assumes the most dense
gas possible to safely breath is used, i.e. a
maximum tolerable pO , pN
2
Adding more Helium will lower the figures.
It is important to understand that this
equation does not apply to any other
regulator, since the coefficients
characteristics are strongly dependent on
the regulator construction.

Breathing curve

The diagram below shows a breathing
curve for Xstream.
40
at any depth.
2
and
SERviCE maNual - xSTREam