Dräger Fabius 4116029 Operating manual

Fabius®
Anesthesia System
Service
Manual
Technical
Date: 11 December 2000
© 2000 Draeger Medical, Inc.
Part Number: 4116029
Rev: C
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i
DESCRIPTION PAGE
Summary of what's new in Revision C
Fabius®Service Manual Table of Contents
SECTION 1:
Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-1
SECTION 2:
Fabius Function Description
1. General Information about Fabius. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-1
2. Fabius Function Diagrams . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-4
3. Function Diagram (2-gas version). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-7
4. Function Diagram (3-gas version). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-8
5. Function Description of the Gas Box . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-9
6. Compact Breathing System COSY/Circle System 9. . . . . . . . . . . . . . . . . . . . . . . . . . . 2-13
7. Ventilation Unit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-33
8. Patient System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-38
9. Electronics Block Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-41
10. Control Box . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-42
11. FiO2 Measurement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-57
12. Flow Measurement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-58
13. Anesthetic Vaporizer “Vapor 19.n” . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-59
SECTION 3:
Fabius Repair Instructions
1. Service Strategy for Fabius . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-1
2. Fabius Versions. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-3
3. Fabius Assemblies . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-4
4. Fabius Assemblies (rear view) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-6
5. Removing Assemblies from Gas Box . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-7
6. Debug Mode (software 1.00). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-8
7. Debug Mode (software 2.00). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-10
8. “Ventilator” VEN Display Field. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-13
9. “Monitor” MON Display Field. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-14
10. “EEPROM” (EEP) Display field . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-16
11. Error Log . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-18
12. DrägerService Mode (software 1.00) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-21
13. DrägerService Mode (software 2.00) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-23
14. General Information about the Control Box. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-25
15. Gas Box . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-81
16. COSY Compact Breathing Sustem Components . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-88
17. Circle Absorbtion System Components . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-96
18. General Information about the Flowmeter Block. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-103
19. General Information about the ORC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-108
Rev. A
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ii
Contents (continued)
DESCRIPTION PAGE
Fabius®
20. General Information about the Ventilator . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-121
21. General Information about the Uninterruptible Power Supply (option) . . . . . . . . . . . . 3-139
22. General Information about the Pneumatics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-142
23. Patient System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-161
24. Tubing Diagram. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-165
SECTION 4:
Test Certificate
1. Unit, General. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-4
2. Circle system mount or compact breathing system . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-6
3. Control Box . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-8
4. Gas Connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-10
5. Cylinder Pressure Reducer. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-11
6. Cylinders. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-12
7. Lack of O2 Alarm . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-13
8. Pressure Regulator . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-13
9. O2 Flush Valve . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-14
10. Ejector Outlet . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-14
11. Secretion Aspirator (optional) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-14
12. AGS System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-16
13. Vapor plug-in system housing section . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-16
14. Safety Valve, flowmeter unit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-16
15. Leak test . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-17
16. Low pressure leak test . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-18
17. Circle system leak test . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-18
18. Flowmeter unit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-21
19. Control valves . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-21
20. S-ORC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-23
21. Control box function test . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-23
22. Testing type of gas, cylinder operation (optional) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-26
23. Testing type of gas, CS operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-27
24. Functional test of ventilation mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-28
25. Safety tests . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-31
26. Assemble unit and all accessories ready for operation. . . . . . . . . . . . . . . . . . . . . . . . . 4-31
27. Tests carried out by/on . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-32
28. Repair work. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-32
29. Report . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-32
SECTION 5:
Spare and Replacement Parts List
Fabius Trolley . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-2, 5-3
Pin Index Trolley Assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-4, 5-5
Writing Tray . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-6, 5-7
Gasbox, including vapor mounts. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-8, 5-9
Flowmeter assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-10, 5-11
Gasinletassemblies. . . . . . ..... . . . . . ..... . . . . . . ..... . . . . . . .... . . . . .5-12 thru 5-15
Circle 9 System: Support . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-16, 5-17
Rev. A
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iii
Contents (continued)
DESCRIPTION PAGE
Fabius®
Circle 9 System: Inspiratory valve. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-18, 5-19
Circle 9 System: Expiratory valve . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-20, 5-21
Circle 9 System: Absorber . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-22, 5-23
Circle 9 System: Intermediate piece . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-24, 5-25
COSY Compact Breathing System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-26, 5-27
COSY Absorber Top . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-28, 5-29
COSY Absorber Canister . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-30, 5-31
Control Box, Front Bezel Assembly, Fuse Data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-32, 5-33
Ventilator Assembly. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-34, 5-35
Battery Assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-36, 5-37
Pneumatic Control System (early design . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-38, 5-39
Pneumatic Control System (later design) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-39A, 5-39B
A-cone Switch, Fresh Gas Hose, Power Cord Assemblies . . . . . . . . . . . . . . . . . . . . . 5-40, 5-41
Flow sensor, O2 Sensor, Pressure Sensor Hose . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-42, 5-43
Optional Items:
Bain Circuit Adapter, Breathing Pressure Gauge . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-44, 5-45
Cylinder Conversion Kit. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-46, 5-47
Semi-Open Adapter Assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-48, 5-49
SECTION 6:
Fault-Cause-Remedy. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-1
SECTION 7:
Changes. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-1
SECTION 8:
Technical Memos . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-1
Rev. C
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Fabius®Introduction
1-1
Copyright 2000 Draeger Medical, Inc. sec1_intro.fm
1.0 Introduction
Recommendations
Because of the sophisticated nature of North American Dräger. anesthesia equipment
and its critical importance in the operating room setting, it is highly recommended that
only appropriately trained and experienced professionals be permitted to service and
maintain this equipment. Please contact DrägerService®at [phone] for service
of this equipment in North America. For service in Europe call 49 [phone]. For
service in other countries call [phone].
North American Dräger recommends that the Fabius be serviced at six month
intervals. Periodic Manufacturer’s Certification agreements are available for
equipment manufactured by North American Dräger. Please contact us for further
information concerning these agreements.
North American Dräger. products /material in need of factory repair shall be sent to:
For North America and other
countries except Europe:
3124 Commerce Drive
Telford, PA 18969 U.S.A.
(Include RMA Number)
Guidelines
Troubleshooting the Fabius should always begin by communicating with those who
observed or experienced a problem with the unit.
After performing any repair, replacement, calibration or adjustment, operation of the
unit must be verified, accompanied by a Test Certificate.
Copyright
Copyright© 2000 by Draeger Medical, Inc. All rights reserved. No part of this
publication may be reproduced, transmitted, transcribed, or stored in a retrieval
system in any form or by any means, electronic or mechanical, including
photocopying and recording, without written permission of Draeger Medical, Inc.
Disclaimer
The content of this manual is furnished for informational use only and is subject to
change without notice. Draeger Medical, Inc. assumes no responsibility or liability for
any errors or inaccuracies that may appear in this manual.
DrägerService®
For service in Europe:
Dräger Medizintechnik GmbH
Moislinger Allee 53-55
23542 Lübeck
Reparaturannahme
Germany
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Fabius®Function Description
2-1
Copyright 2000 Draeger Medical, Inc. sec2_funcdescrip_b.fm
2.0 Function Description
1 General Information About Fabius
The Fabius basic unit consists of the following assemblies:
−control box
−gas box (on rear panel of Fabius)
−flowmeter block
−compact breathing system "Cosy"/circle absorption system "Circle System
9/Fabius"
−pneumatics
−ventilator (located in the swing-out part of Fabius)
−anesthetic vaporizer "Vapor 19.n"
−trolley
Fig. 1: Fabius equipped with a compact breathing system "Cosy"
Fabius
S-ORC
O2 +
control box
flowmeter block
trolley
anesthetic vaporizer
"Vapor 19.n“
compact
breathing system
ventilator
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Fabius®
Function Description
2-2
Copyright 2000 Draeger Medical, Inc.
sec2_funcdescrip_b.fm
Fig. 2: Fabius equipped with a circle absorption system "Circle System 9 Fabius"
Fabius
5
10 30
70
50
max. 134 C
S-ORC
O2 +
trolley
anesthetic
vaporizer "Vapor
flowmeter
block
control box
ventilator
circle
absorption
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Fabius®Function Description
2-3
Copyright 2000 Draeger Medical, Inc. sec2_funcdescrip_b.fm
Fabius provides connections for the following medical gas cylinders:
−O2cylinder
−N2O cylinder
Fabius can be retrofitted with the following assemblies/functions:
−drawer assembly
−rechargeable batteries for uninterruptible power supply (UPS)
−additional gas (AIR)
−cylinder set mount
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Fabius®
Function Description
2-4
Copyright 2000 Draeger Medical, Inc.
sec2_funcdescrip_b.fm
2FabiusFunctionDiagrams
Fig. 3: Function diagram of Fabius with compact breathing system "Cosy"
lung
ventilator
absorber
outlet
breathing
PEEP control valve
fresh gas
SPONT/ IPPV
APL valve
MAN
Paw
O2
inspiratory
valve
V
.
fresh-gas
decoupling
expiratory valve
safety valve
auxiliary air
piston pump
electronicPEEP
valve
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Fabius®Function Description
2-5
Copyright 2000 Draeger Medical, Inc. sec2_funcdescrip_b.fm
Fig. 4: Function diagram of Fabius with circle absorption system "Circle System 9
Fabius"
lung
2nd absorber (optional)
ventilator
1st absorber
outlet
breathing
bag
electronic
PEEP valve
piston pump
fresh gas
flow
SPONT/
IPPV
APL valve
MAN
Paw
inspiratory valve
O2
expiratory valve
and PEEP valve
fresh-gas
decoupling valve
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Fabius®
Function Description
2-6
Copyright 2000 Draeger Medical, Inc.
sec2_funcdescrip_b.fm
2.1 Optional Uninterruptible Power Supply (UPS)
The uninterruptible power supply (UPS) consists of two rechargeable batteries. These
rechargeable batteries are connected in series thus providing a total voltage of 24 V.
The UPS is charged during the operation phases. In the event of a voltage drop or a
complete power failure, the UPS can backup operation for approx. 90 minutes. The
UPS is located in the gas box. Connection is made on the rear panel of the control
box.
Fig. 5: Block diagram of Fabius’voltage supply
ventilator
monitor
uninteruptible power
supply (UPS)
control box
5V
regulator
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Fabius®Function Description
2-7
Copyright 2000 Draeger Medical, Inc. sec2_funcdescrip_b.fm
3 Function Diagram (2-gas version)
Fig. 6: Function Diagram (2-gas version)
O2
N2O
pressure regulator
anesthetic vaporizer
O2flush
filter
pressure gauges
filter
injector
flowmeter block
gas box
non-return valves
reservoir
flowmeters
S-ORC
whistle
fresh gas
suction ejector
O2N2O
flow control valve
filter
filter
RV1
pressure regulator
DUMMY TEXT
DUMMY TEXT
DUMMY TEXT
DUMMY TEXT
DUMMY TEXT
DUMMY TEXT
DUMMY TEXT
DUMMY TEXT
DUMMY TEXT
DUMMY TEXT
DUMMY TEXT
DUMMY TEXT
DUMMY TEXT
DUMMY TEXT
DUMMY TEXT
DUMMY TEXT
DUMMY TEXT
inlet valve, vent
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Fabius®
Function Description
2-8
Copyright 2000 Draeger Medical, Inc.
sec2_funcdescrip_b.fm
4 Function Diagram (3-gas version)
Fig. 7: Function Diagram of the Fabius (3-gas version)
O2
N2O
pressure regulators
anesthetic vaporizer
O2flush
filter
pressure gauges
injector
flowmeter block
gas box
non-return valves
reservoir
flowmeters
S-ORC
whistle
fresh gas
suction ejector
O2N2O
flow control valve
filter
RV1
AIR
1.5 barr
3barr
2 barr
DUMMY TEXT
DUMMY TEXT
DUMMY TEXT
DUMMY TEXT
DUMMY TEXT
DUMMY TEXT
DUMMY TEXT
DUMMY TEXT
DUMMY TEXT
DUMMY TEXT
DUMMY TEXT
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inlet valve, vent
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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 O2supply
gas has reached a sufficient pressure, it flows through the spring-loaded non-return
valve RV 1 and fills the reservoir.
If the O2supply fails or if the pressure of the O2supply 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 O2-failure alarm).
Fig. 8: Function diagram of the gas box (3-gas version), part 1
O2N2O
reservoir
injector O2flush
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
N2O
O2
RV1
2-way valve
filter
supply gases
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Fabius®
Function Description
2-10
Copyright 2000 Draeger Medical, Inc.
sec2_funcdescrip_b.fm
If the O2-flush button is pressed, the fresh-gas ejector prevents the fresh gas from
flowing back into the anesthetic vaporizer. This avoids an increase in the anesthetic
gas concentration.
Fig. 9: Function diagram of the gas box (3-gas version), part 2
O2flush
anesthetic
vaporizer
fresh gas
fresh-gas
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Fabius®Function Description
2-11
Copyright 2000 Draeger Medical, Inc. sec2_funcdescrip_b.fm
5.1 S-ORC (Sensitive Oxygen Ratio Controller)
The S-ORC is a control element that functions like an N2O shut-off device and
ensures a vital O2concentration in the fresh gas. In the event of an O2shortage, the
S-ORC limits the N2O flow such that the O2concentration in the fresh gas does not
decrease below 21 vol.%. For the S-ORC to function properly O2 and N2O must have
different pressures.
If the O2flow control valve is closed or if the O2flow is lower than or equal to
200 mL/min, the S-ORC interrupts the N2O flow.
N2O can be added as of an O2flow of approx. 300 mL/min. In this case, the S-ORC
also prevents O2concentrations below 21 vol.%.
The inlet valve vent allows O2to bypass the restrictor in the S-ORC when O2flows
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 O2flush
flowmeters
flow control valve
fresh gas
safety valve
(<1 bar)
from the gas box (AIR)
inlet valve, vent
Rev. A
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Fabius®
Function Description
2-12
Copyright 2000 Draeger Medical, Inc.
sec2_funcdescrip_b.fm
The flow control valves are used to adjust the O2and N2O flows.
Restrictors located at the outlets of the S-ORC generate back-pressures. These
back-pressures exert a force on the control diaphragms of the S-ORC. The O2
back-pressure opens the S-ORC. The N2O back-pressure closes the S-ORC. The
pressure ratio at the control diaphragm affects the N2O flow.
The restrictors and the spring tension are dimensioned such that a minimum
concentration of 21 vol.% O2is always ensured. The maximum O2 flow is approx. 9
L/min.
Fig. 11: S-ORC function diagram, part 2
O2N2O
O2N2O
N2O check valve
restrictors
control
diaphragms
flow control
flowmeters
operating-point
adjusting screw
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