Description
108
Instructions for use D-Vapor/D-Vapor 3000
Function
Mixed gas (A) (carrier gas (B)) is passed via the
fixed flow resistance of the bypass gap (C).
Desflurane vapor (saturated vapor (D)) flows from
the heated tank (E) via the metering gap (F).
Carrier gas and saturated vapor combine and mix
shortly ahead of the fresh-gas outlet (G).
With the aid of the differential pressure sensor
(control sensor (H)), the controller (I) meters
sufficient saturated vapor via the proportional valve
(J) to ensure that the pressure drop across the two
gaps (bypass and metering gap) is always equally
large.
The desflurane concentration is determined by the
ratio of the resistances of the fixed bypass gap and
the metering gap. This ratio is set by the control dial
(K).
The regulated tank heater provides a constant
temperature (40 °C (104 °F)) and consequently a
constant, adequate pressure (200 kPa (29 psi)) in
the desflurane tank.
The shut-off valve (L) blocks the desflurane tank
during the warm-up phase, when the control dial is
in the 0 position or when a fault occurs (No
Output).
046
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