Calibration
Dräger Vapors are calibrated individually with interfe-
rence refractometers at 22
°
C and at 30
°
C with a flow
of 2.5 L/min of Air.
Calibration is in % partial pressure (% of 1013 hPa), as
is appropriate for most vaporisers which use surface
evaporation. The depth of anaesthesia depends on the
patient's uptake which is itself determined by partial
pressure.
Concentration delivered in % partial pressure at normal
pressure of 1013 hPa is identical numerically with the
output given in volume percent, so that the specification
on the Vapor is given in units of "vol.% at 1013 mbar".
The output in vol.% must be corrected for other
atmospheric pressure values (see Influence of
atmospheric pressure, page 36), but partial pressure and
mg/L are absolute values. Output given in % partial
pressure is proportional to the quantity of anaesthetic
agent delivered in mg per litre of fresh gas. Data output in
units of mg/L is unusual, because this varies for different
anaesthetic agents at identical partial pressures due to
differences in molecular weights.
Some measuring devices used for monitoring
concentration are designed to measure in % partial pres-
sure, and others in vol.%. When monitoring the concen-
tration delivered by Vapor it is essential to have
information about the units of measure of the monitor and
whether conversion of the results to % partial pressure is
required.
For simplicity, in these Instructions for Use settings are
given in the abbreviated form of vol.%, which means
vol.% at 1013 hPa and % partial pressure, respectively.
Description
Calibration
32
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