5327.400 Vapor 2000 05/99 Function Description Page 5
For internal use only. Copyright reserved.
GBF5327400T01.fm 28.08.01
2Calibration
Each Vapor 2000 is individually calibrated to 22 °C and with continuous air flow (2.5 L/min)
with no ventilation pressure. At 22 °C and at 30 °C with 2.5 L/min air and 8 L/min each
Vapor 2000 is tested.
The calibration is carried out in percentage partial pressure (% of 1013 hPa), as the
anaesthesia depth is determined by the partial pressure and the uptake by the patient
dependent upon it.
At normal pressure (1013 hPa), concentrations in percentage partial pressure are identical to
the percent by volume figures. That is what the “vol.%” figure on the Vapor 2000 relates to.
If the air pressure values change, the percent by volume (vol.%) also changes
(see “Dependency on air pressure” on page 11). The partial pressure remains constant
(refer also to “Dependency on gas composition” on page 10).
Settings on the Vapor 2000 and in the Function Description are abbreviated as vol.%. They
refer to percent by volume at 1013 hPa and to percentage partial pressure respectively.
The scale values on the handwheel indicate the concentration of the gases at 22 °C with dry
air (see technical specifications of the machine in the Instructions for Use).
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