5327.400 Vapor 2000 05/99 Function Description Page 10
For internal use only. Copyright reserved.
GBF5327400T01.fm 28.08.01
3.3 Dependency on gas composition
The concentration delivered by the Vapor 2000 is dependent on the composition of the fresh
gas. The viscosity and density of the gas changes with the type and composition of the fresh
gas. The Vapor 2000 is calibrated with air, because the delivered concentration is then just in
the middle of the range of common anaesthetic gas mixtures.
In operation with pure oxygen (100% O
2
), the delivered concentration rises relative to air by a
maximum of 10% (but by max. 0.4 vol.%). In operation with 30% O
2
and 70% N
2
O, the
delivered concentration decreases relatively by a maximum of 10% (but by max. 0.4 vol.%).
The effects of the gas composition are rather different for the various anaesthetic agents, and
consequently the maximum effects are given here.
When gas mixtures change a dynamic effect may also occur. Until the previous fresh gas is
flushed out of the vaporizer chamber an additional deviation in concentration may occur.
These deviations and their duration are all the greater:
− the less anaesthetic there is in the Vapor 2000
− the higher the pre-set concentration and
− the more extreme the change of gas type
− the lower the gas flow.
The degree of dynamic deviation increases as the gas flow increases, whereas its duration
decreases.
Dependency of delivered concentration on carrier gas at a setting of 1 vol.%.
Fig. 6: Dependency on gas composition
Gases which contain a higher level of humidity than specified in the technical specifications
of the device (see Instructions for Use) may influence the delivered concentration to a minor
degree.
0204060
0
0,5
1
1.5
vol.% at 1013 hPa
Setting on
handwheel
Gas change
Gas change
100% O2
30% O2
70% N2O
100% AIR
Minutes
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