5327.400 Vapor 2000 05/99 Function Description Page 4
For internal use only. Copyright reserved.
GBF5327400T01.fm 28.08.01
1.3 Handwheel set to “ON” or higher
Between “0” and “ON” no concentration is defined in this range.
If the handwheel is turned to “ON” the fresh gas flows through the valve coupled to the
handwheel (switching states a and b) in the vaporizer chamber. The valve (switching state c)
closes the additional bypass.
Part of the fresh gas flows through the wick and is enriched with anaesthetic vapour (
→).
The other part of the fresh gas bypasses the vaporizer chamber through the vaporizer
chamber bypass.
The two part-flows are combined downstream of the flow control slots and fed to the outlet.
The concentration is produced by the split of the gas and the saturation concentration of the
anaesthetic. The split is also influenced by the temperature compensation (thermal expansion
of different materials). When the temperature compensator heats up it opens the vaporizer
chamber bypass. When the temperature compensator cools down it narrows the vaporizer
chamber bypass. This compensates for the influence of temperature on the saturation
concentration.
The pressure compensation effectively reduces the pumping effect (see “Dependency on
alternating pressure during ventilation” on page 13).
Fig. 3: Handwheel set to “ON” or higher
Flow control cone
Valve (switching state a)
Valve (switching state c)
Handwheel
Valve (switching state b)
Additional bypass
Vaporizer chamber bypass
Vaporizer outlet
Vaporizer chamber
Wick
Temperature compensator
Pressure compensator
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