Datex-Ohmeda Avance - Gas Supplies; O2 Flow; Air and N2 O; Mixed Gas

Avance
11-4 M1204616
Gas supplies Pressurized gas supplies enter the system through a pipeline or
cylinder connection. All connections have indexed fittings, filters, and
check valves.
A regulator decreases the cylinder pressures to the appropriate
system pressure. A pressure relief valve helps protect the system
from high pressures.
To help prevent problems with the gas supplies:
• Install yoke plugs on all empty cylinder connections.
• When a pipeline supply is connected, keep the cylinder valve
closed.
• Disconnect the pipeline supplies when the system is not in use.
WARNING Do not leave gas cylinder valves open if the pipeline
supply is in use. Cylinder supplies could be depleted,
leaving an insufficient reserve supply in case of pipeline
failure.
O2 flow Pipeline or regulated cylinder pressure supplies O2 directly to the O2
channel of the gas mixer and to the ventilator if O2 is configured as
drive gas. If the pressure is too low, an alarm appears on the display.
A second regulator decreases the pressure for the flush valve and the
auxiliary O2 flowmeter.
The flush valve supplies high flows (between 35 and 50 l/min) of O2
to the fresh gas outlet when the O2 flush button is pushed. The flush
switch uses pressure changes to monitor the position of the flush
valve.
Air and N2O Pipeline or regulated cylinder pressure supplies Air directly to the air
channel of the gas mixer and to the ventilator if Air is configured as
drive gas. If the pressure is too low, an alarm appears on the display.
Pipeline or regulated cylinder pressure supplies N2O directly to the
N2O channel of the gas mixer. If the pressure is too low, an alarm
appears on the display.
Mixed gas Either Air or N2O can be selected as the balance gas. The balance
gas flow is controlled by the mixer. When Alternate O2 control is in
use, only O2 is flowing and balance gas is disabled.
The mixed gas goes from the mixer outlet through the vaporizer to the
fresh gas outlet and into the breathing system. A pressure-relief valve
sets the maximum outlet pressure.
Note When the total flow is adjusted toward the lower flow limit and the
calculated O2 flow is required to go below 100 ml, a message shows
in the gas settings area of the screen. The anesthesia system
calculates the required O2% to maintain the user-set total flow.