Influence of running time
Evaporation of the anaesthetic agent during operation
cools the Vapor. The temperature falls more rapidly the
higher the concentration set and the higher the flow
selected. Saturation concentration decreases as the
temperature falls and so the concentration delivered also
decreases.
Temperature compensation counters this and limits devia-
tions in the concentration delivered. However, since the
temperature at the evaporation point differs a little from
the temperature of the temperature compensation
mechanism depending on evaporation rate, the duration
of operation has some effect on concentration. Since
ambient heat is more effectively absorbed as a Vapor
cools, a Vapor stabilises at a lower temperature and a
slightly lower concentration after a certain time of opera-
tion.
All Vapors 19.n conform to DIN 13252, which stipulates
that after 20 minutes, and at 8 L/min and 22
°
C, no
concentration may deviate from the set value by more
than
±
20 % or
±
0.2 vol.%.
The diagrams show typical concentration curves, taken at
22
°
C and 4 L/min Air.
Halothane
5
4
3
2
1
0
20
40
60
Zeit [min]
Enflurane
5
4
3
2
1
0
20
40
60
Zeit [min]
Isoflurane
5
4
3
2
1
0
20
40
60
Zeit [min]
Sevoflurane
5
4
3
2
1
8
7
6
0
20
40
60
Zeit [min]
5
3
1
Abgegebene
Konzentration [Vol.%]
Eingestellte
Konzentration
[Vol.%]
Abgegebene
Konzentration [Vol.%]
Eingestellte
Konzentration
[Vol.%]
5
3
1
Abgegebene
Konzentration [Vol.%]
Eingestellte
Konzentration
[Vol.%]
5
3
1
Abgegebene
Konzentration [Vol.%]
Eingestellte
Konzentration
[Vol.%]
4
2
8
6
Description
Influence of running time
38
Concentration
delivered [vol.%]
Set
concentration
[vol.%]
Time [min]
Concentration
delivered [vol.%]
Set
concentration
[vol.%]
Time [min]
Concentration
delivered [vol.%]
Set
concentration
[vol.%]
Time [min]
Concentration
delivered [vol.%]
Set
concentration
[vol.%]
Time [min]
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