VisualSonics VEVO Operator's Manual page 43

Time out of service
Other variables
V1.0 VisualSonics Vevo Integrated Rail System Operator Manual
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the output when oxygen is the carrier gas. The presence of nitrous oxide
reduces the required inspired concentration of volatile agent and this
mitigates this small depression in output from the vaporizer.
If the anesthetic machine on which the vaporizer is fitted is left for a
period of time with no gases flowing, a concentration of agent may be
observable at the machine outlet when the gas flow is turned 'On' and the
vaporizer is turned 'off.' This concentration can be expected to fall
rapidly to zero (e.g. within about 15 seconds at 5 liter/min.). This
phenomenon is a normal characteristic of anesthetic vaporizers and
machines. Clinically this is normally considered to be insignificant
because of the small volume of vapor involved.
Ambient temperature, input flow rate and duration often can affect
delivered concentrations, particularly when the vaporizer is used at
extremes of the usual clinical range. The valve design and temperature
compensation system of this vaporizer reduces these effects, under most
clinical conditions, to levels that are clinically not significant.
Appendix B: Specifications and Performance
33