Dräger Fabius 4116029, Техническое и сервисное руководство, Страница: 19 / 328

Fabius
®
Function Description
2-11
Cop
yr
ight
2000 Dr
aeger
M
edical,
In
c.
sec2_f
uncdescri
p_b
.fm
5.1 S-ORC (Sensitive Oxygen Ratio Controller)
The S-ORC is a control element that functions like an N
2
O shut-off device and
ensures a vital O
2
concentration in the fresh gas. In the event of an O
2
shortage, the
S-ORC limits the N
2
O flow such that the O
2
concentration in the fresh gas does not
decrease below 21 vol.%. For the S-ORC to function properly O
2
and N
2
O must have
different pressures.
If the O
2
flow control valve is closed or if the O
2
flow is lower than or equal to
200 mL/min, the S-ORC interrupts the N
2
O flow.
N
2
O can be added as of an O
2
flow of approx. 300 mL/min. In this case, the S-ORC
also prevents O
2
concentrations below 21 vol.%.
The inlet valve vent allows O
2
to bypass the restrictor in the S-ORC when O
2
flows
above 10 L/min. are needed.
Fig. 10:
S-ORC function diagram, part 1
flowmeter block
S-ORC
anesthetic
vaporizer
from the gas box (O2)
from the gas box (N2O)
from the O2 flush
flowmeters
flow control valve
fresh gas
safety valve
(<1 bar)
from the gas box (AIR)
inlet valve, vent
Rev. A
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