5327.400 Vapor 2000 05/99 Function Description Page 14
For internal use only. Copyright reserved.
GBF5327400T01.fm 28.08.01
3.7 Dependency on time in use
The vaporization of the anaesthetic during operation causes the Vapor 2000 to cool slowly.
The saturation concentration of the anaesthetic in the Vapor 2000 decreases more the
longer the machine is in operation, the higher the pre-set concentration and the higher the
selected fresh-gas flow – that is, the greater the vaporized quantity of anaesthetic per time
period.
The temperature compensation effectively counteracts this, and limits the deviations in the
delivered concentration. After a certain time in use the Vapor 2000 stabilizes to a somewhat
lower temperature and a concentration deviating slightly from the initial value.
The accuracy quoted in the technical specifications of the machine (see Instructions for Use)
is maintained as long as the vaporizer temperature does not decrease below the lower limit
of the operating range.
The diagrams show typical concentration characteristics over 4 and 6 hours time in use
respectively, measured at 22 °C and 1013 hPa.
The figures on the curves indicated the operating conditions applied:
1. 6/8 vol.%, at 1 L/min
2. 6/8 vol.%, at 4 L/min
3. 3/4 vol.%, at 4 L/min
4. 1 vol.%, at 10 L/min
5. 1 vol.%, at 4 L/min
Interruptions in the curves are operating breaks to top up anaesthetic.
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