Dependency On Flow Rate - Dräger Vapor 2000 Technical Documentation Manual

The operating range of the Vapor 2000 on Dräger anaesthetic machines is adjusted so that,
under super-critical conditions of 700 hPa, 40 °C (or 850 hPa at 35 to 40 °C) and maximum
negative pressure of –100 mbar on the Vapor 2000, the boiling point of the anaesthetic is
not reached.
The temperature compensation is free of ageing and hysteresis effects. The large vaporizer
mass additionally compensates for temperature differences. Temperature differences
between the Vapor 2000 and its surroundings are equalised within the operating range.
If the ambient temperature of the Vapor 2000 is outside a range of 10 to 40 °C prior to use,
a temperature equalisation time of 15 min/°C must be allowed in order to maintain the
concentration within the specified accuracy.
In operation with high fresh-gas flow and high concentrations, the Vapor 2000 cools down as
a result of vaporization (see "Dependency on time in use" on page 14).
3.2

Dependency on flow rate

The delivered concentration of the Vapor 2000 in the specified flow range is to a minor
degree dependent on the fresh-gas flow.
If high concentrations are set and in the presence of a high fresh-gas flow as a result of
increasing pressure, a minor reduction of the pre-set concentration in the Vapor 2000
occurs. As a result the cooling during vaporization of the anaesthetic is no longer fully
compensated (see "Dependency on time in use" on page 14).
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5327.400 Vapor 2000 05/99 Function Description