Checking concentration
Concentration measurements to check specified
accuracy can only be carried out with highly accurate
measuring devices and under precise calibration
conditions.
Observe the following test conditions:
●
Vapor at least half full.
●
Condition the filled Vapor to (22
±
2)
°
C. If the Vapor
has previously been used or stored at a different
temperature wait for a time for the temperature to
equalise. This time varies with the temperature
difference.
●
Pressure fluctuations less than 5 mbar.
●
Set flow of between 2.5 to 4 L/min. Use O
2
if Air is
not available. Allow gas to flow into scavenging
system.
●
Connect tested anaesthetic agent measuring device
to Vapor outlet or to fresh gas outlet on anaesthetic
machine. Set measuring device as appropriate for
anaesthetic agent used. For zero calibration of
measuring device, the carrier gas used (Air or O
2
)
must be taken into account. The measuring device
must be more accurate than
±
0.1 vol.% and
±
10 %
of measured value.
Make sure that the concentration is not affected by
absorption or leaks in the connecting line.
Note whether measured values are in % partial
pressure or vol.%.
Check at least 3 concentration settings, including 1 and
4 vol.%.
Adjust handwheel, then take concentration reading on
measuring device after about 2 minutes.
The concentration delivered as partial pressure must be
within the following tolerances:
±
15 % of set value or 0.15 % partial pressure whichever
is the greater (for Vapors with a maximum concentration
of 4 and 5 vol.%)
and
±
20 % of set value or 0.20 % partial pressure whichever
is the greater (for Vapors with a maximum concentration
of 7 and 8 vol.%)
plus the tolerance of the measuring device used.
Note that the tolerance of the measuring device may be
greater in the lower concentration range.
Also note that, if the test is carried out with O
2
, the tole-
rances will be shifted in addition to higher concentrations,
since O
2
increases the concentration delivered by the
Vapor.
Care
Checking concentration
24
∆
T up to
±
2
°
6
°
10
°
20
°
Hours
1
3
4
5
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