Fabius
®
Function Description
2-9
Copyright 2000 Draeger Medical, Inc.
sec2_funcdescrip_b.fm
5 Function Description of the Gas Box
The supply gases flow through the built-in filters of the compressed-gas connections
and are then available at the pressure gauges. The pressure gauges indicate the
current pressure of the supply gases. The non-return valves prevent a reverse flow.
The pressure of the supply gases is reduced by pressure regulators. The
low-pressure supply gases then flow to the flowmeter block. As soon as the O
2
supply
gas has reached a sufficient pressure, it flows through the spring-loaded non-return
valve RV 1 and fills the reservoir.
If the O
2
supply fails or if the pressure of the O
2
supply gas decreases below a certain
value, the 2-way valve switches over. The gas stored in the reservoir flows through the
2-way valve and the injector and activates the whistle (audible O
2
-failure alarm).
Fig. 8: Function diagram of the gas box (3-gas version), part 1
O
2
N
2
O
reservoir
injector
O
2
flush
non-return valves
whistle
to the flowmeter
to the flowmeter
to the
anesthetic
vaporizer
pressure
gauges
pressure regulators
filter
gas box
AIR
to the flowmeter
suction ejector
filter
N
2
O
O
2
RV1
2-way valve
filter
supply gases
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