Influence of atmospheric pressure
The anaesthetic agent partial pressure delivered by Vapor
(see calibration, page 32) is almost independent of
atmospheric pressure, so that weather-based fluctuations
do not need to be taken into account and altitude-based
pressure changes in the range 700 to 1100 hPa will lead
to only small deviations within the accuracy specified.
For this reason, the physiological effect – the depth of
anaesthesia – at a defined Vapor setting is independent
of atmospheric pressure.
When measuring the concentration delivered by Vapor in
partial pressure (e.g. with Dräger IRIS or PM 8030/35)
there is no influence of ambient pressure.
When measuring in volume percent (e.g. with Dräger
PM 8020 or PM 8050) the measured values do,
however, change with atmospheric pressure and
measured values rise, when atmospheric pressure falls
below 1013 hPa.
The following formula for conversion applies:
Concentration
[% partial pressure]
Example:
A concentration output of 4 % partial pressure, when
measured in units of vol.% at an altitude of 1000 m
(900 hPa) is 4.5 vol.% , and at 2000 m (795 hPa) it is
5.1 vol.%.
Under no circumstances must Vapor 19.n be used at
atmospheric pressures and temperatures at which the
anaesthetic agent could start to boil (see "Influence of
temperature", page 33), as the concentration delivered
rises and is impossible to control.
Description
Influence of atmospheric pressure
36
= Measured value [vol.%]
●
atmospheric pressure [hPa]
1013 hPa
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