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Operation
Setting A-Vap limit values
Using the graph, determine
the limit values depending
on
the sening of the anaesthetic
vaporiser.
The upper limit
values are based on the maximum permissible
,vaiues
which must not be exceeded.
The lower limit value may be set even lower when
necessary
for clinical reasons.
Vertical axis:
Setting of limit values (0 to 6% by vol.)
/r upper limit value
I/
lower limit value
Horizontal
axis:
Concentrations
set on anaesthetic
vaporiser
(0 to 5% by vol.)
Example:
The anaesthetic
vaporiser
was set at 1.4% by vol.:
the intersection
with the lower line projected
to the left
shows the lower limit value Y:
about 0.7% by voi
The intersection
with the upper line projected
to the left
shows the upper limit value /f:
about 2.1% by vol.
Rule of thumb:
lower limit value Y = set value - 50%
upper limit value/f
= set value + 50%, max. 6% by vol
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