Datex-Ohmeda Aespire 7900 Reference Manual

Aespire 7900

User’s Reference Manual—Part 2

Setup, Cleaning and Sterilization, Maintenance and Troubleshooting

User Responsibility

This Product will perform in conformity with the description thereof contained
in this User’s Reference manual and accompanying labels and/or inserts,
when assembled, operated, maintained, and repaired in accordance with the
instructions provided. This Product must be checked periodically. A defective
Product should not be used. Parts that are broken, missing, plainly worn,
distorted, or contaminated should be replaced immediately. Should repair
or replacement become necessary, Datex-Ohmeda recommends that a
telephonic or written request for service advice be made to the nearest
Datex-Ohmeda Customer Service Center. This Product or any of its parts
should not be repaired other than in accordance with written instructions
provided by Datex-Ohmeda and by Datex-Ohmeda trained personnel.
The Product must not be altered without the prior written approval of
Datex-Ohmeda. The user of this Product shall have the sole responsibility
for any malfunction which results from improper use, faulty maintenance,
improper repair, damage, or alteration by anyone other than Datex-Ohmeda.

w CAUTION U.S. Federal law restricts this device to sale by or on the order of

a licensed medical practitioner. Outside the U.S.A., check local
laws for any restriction that may apply.

Datex-Ohmeda products have unit serial numbers with coded logic which
indicates a product group code, the year of manufacture, and a sequential
unit number for identification.

AAA F 12345

This alpha character indicates the year of product
manufacture and when the serial number was
assigned; “D” = 2000, “E” = 2001, “F” = 2002, etc.
“I” and “O” are not used.

S/5 Aespire, Link-25, Disposable Multi Absorber, Reusable Multi
Absorber, SmartVent, Tec 6 Plus, and Tec 7 are registered trademarks of

Datex-Ohmeda Inc.

Other brand names or product names used in this manual are trademarks or
registered trademarks of their respective holders.

Table of Contents

Symbols used in the manual or on the equipment . . . . . . . . . . . . . . . . . . . . . . v

1 Setup and Connections

Canister setup . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-3

When to change the absorbent . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-4

Removing a canister . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-5

Reusable Multi Absorber canister filling . . . . . . . . . . . . . . . . . . . . . . . . 1-6

Pneumatic and electrical connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-7

How to install gas cylinders (high pressure leak test) . . . . . . . . . . . . . . . . . . 1-8

2 Cleaning and Sterilization

Pin indexed cylinder yokes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-8

DIN cylinder connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1-10

Installation notes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-11

How to attach equipment to the top shelf . . . . . . . . . . . . . . . . . . . . . . . . . .1-12

Breathing system cleanable parts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-3

Special requirements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-4

How to clean and disinfect the flow sensors . . . . . . . . . . . . . . . . . . . . . . . . . 2-4

CIDEX sterilization . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-4

Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-5

Remove the breathing system bag hose . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-6

Remove the breathing system . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-7

Disassemble the breathing system . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-8

Disassemble the Bellows assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-12

Assemble the Bellows assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-14

Bellows assembly tests . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-15

1009-0633-000

Assemble the breathing system . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-18

Install the breathing system . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-22

Remove the AGSS receiver . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-23

Remove the AGSS receiver filter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-24

Absorber canister . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-25

i

S/5 Aespire

3 User Maintenance

Mechanical cleaning in washer or washer-disinfector . . . . . . . . . . . . 2-26

Manual cleaning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-26

High level disinfection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-26

Repair policy . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-2

Maintenance summary and schedule . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-2

User maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-2

Datex-Ohmeda approved

service . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-3

Breathing system maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-4

O

sensor replacement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-4

2

sensor calibration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-5

O

2

21% O

100% O

sensor calibration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-5

2

sensor calibration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-9

2

Flow sensor zeroing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-11

4 Alarms and Troubleshooting

5 Parts

How to prevent water build-up . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-12

About alarms . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-2

Alphabetical list . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-4

Breathing system problems (no alarm) . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-15

Electrical problems (power failure, etc.) . . . . . . . . . . . . . . . . . . . . . . . . . . .4-16

Pneumatic problems . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4-18

Alarm settings range and default values . . . . . . . . . . . . . . . . . . . . . . . . . . .4-19

Flow sensor module . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-2

Breathing circuit module . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-3

Bellows . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-4

Absorber canister . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-5

Exhalation valve assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-6

AGSS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-7

6 Specifications and
Theory of Operation

ii

Test tools and system parts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-8

System pneumatic circuits . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-2

Gas supplies . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-4

1009-0633-000

O

flow . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-4

2

Air and N

O . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-4

2

Mixed gas . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-5

System specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-5

Pneumatic . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-5

Flow . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-5

Electrical power . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-6

Power cord . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-7

Battery information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-7

Electromagnetic compatibility . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-8

Guidance and manufacturer's declaration

- electromagnetic emissions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-9

Recommended separation distances . . . . . . . . . . . . . . . . . . . . . . . . .6-12

Figure 6-2 legend . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-14

Physical specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-15

System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6-15

Casters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-15

Drawers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-15

Ventilator display . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6-15

Environmental requirements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6-15

Temperature . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6-15

Humidity . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6-15

Altitude . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6-15

Breathing system specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6-16

General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6-16

Gas scavenging . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6-17

Ventilator theory . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6-18

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6-18

Modes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-19

Minimum monitoring . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6-22

Ventilation operating specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-23

1009-0633-000

Ventilator accuracy data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6-26

Delivery accuracy . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-26

Monitoring accuracy . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6-26

Suction regulators (optional) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6-28

Venturi suction regulator . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-28

iii

S/5 Aespire

Continuous suction regulator . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-28

Warranty

Auxiliary O

flowmeter (optional) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6-28

2

iv

1009-0633-000

Symbols used in the manual or on the equipment

w WARNINGS and w

can occur if you do not follow all instructions in this manual. Read and follow
all warnings and cautions.

WARNINGS tell about a condition that can cause injury to the operator or the

patient.

CAUTIONS tell about a condition that can cause damage to the equipment.

A Note provides additional information to clarify a statement in text.

An Important statement is similar to a Note, but provides a comment of
greater emphasis.

Other symbols replace words on the equipment or in Datex-Ohmeda manuals.
No one device or manual uses all of the symbols. These symbols include:

On (power)

øø

øø

Off (power)

O

Standby

o

Standby or preparatory state for part of the

q

equipment

CAUTIONS tell you about dangerous conditions that

Not autoclavable

ÍÍ

ÍÍ

Type B equipment

mm

mm

Type BF equipment

µµ

µµ

Type CF equipment

HH

HH

“ON” only for part of the equipment

p

“OFF” only for part of the equipment

œ

Direct current This way is up.

†

Alternating current

∏

Protective earth ground

x

Earth ground Output

y

Frame or chassis ground

r

Alarm silence button

å

Equipotential

Y

ww

ww
WW

wwwwWW

N

N

ππ

ππ

≈≈

≈≈

REF Stock Number

NN

SSSSNN

R

t

Variability

Caution, ISO 7000-0434

Attention, refer to product
instructions, IEC 601-1.

Dangerous Voltage

Input

Serial Number

Bag position/ manual ventilation

Read top of float

1009-0633-000

v

Aespire 7900

T

++

++

P

N

ˆ

z

Z

Variability in steps Vacuum inlet

Plus, positive polarity Suction bottle outlet

Minus, negative polarity

--

--

Lamp, lighting, illumination Cylinder

Movement in one direction Isolation transformer

Movement in two directions Low pressure leak test

Lock

OO

OO

O

Flush button

2

++

++

22

22

Mechanical ventilation

r

Unlock

Close drain

U

44

1111333344

°CC

u

q

t

CC

Autoclavable

Expiratory flow

Q

Open drain (remove liquid) Alarm silence touch key

Inspiratory flow Menu touch key

O2 sensor connection Alarm silence touch key

(Tec 6)

Volume alarms On/Off touch key End case touch key

vi

1009-0633-000

Table of Contents

XXXX

Systems with this mark agree with the
European Council Directive (93/42/EEC) for
Medical Devices when they are used as
specified in their Operation and Maintenance
Manuals. The xxxx is the certification number
of the Notified Body used by Datex-Ohmeda’s
Quality Systems.

European Union Representative

1009-0633-000 vii

Aespire 7900

viii 1009-0633-000

1 Setup and Connections

In this section

Canister setup . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-3

Pneumatic and electrical connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-7

How to install gas cylinders (high pressure leak test) . . . . . . . . . . . . . . . . . . 1-8

Installation notes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-11

How to attach equipment to the top shelf . . . . . . . . . . . . . . . . . . . . . . . . . .1-12

1009-0633-000

1-1

Aespire 7900

Important Datex-Ohmeda strongly recommends that you use O

equipment. Refer to local standards for mandatory monitoring.

Important European Standard EN 740 and International Standard IEC 60601-2-13/ISO

8835-1 require exhaled volume monitoring, O
with EN 12342, or ISO 7767) and CO
or ISO 9918) be used with this equipment.

Important European Standard EN 740 and International Standard IEC 60601-2-13/ISO

8835-1 also require anesthetic agent monitoring (in accordance with ISO

11196) be used when anesthetic vaporizers are in use.

ww

ww

WARNING Always make sure that the pipeline supply hoses and the

monitoring (in accordance with EN 864

2

monitoring with this

2

monitoring (in accordance

2

breathing circuit components are not toxic and will not:

• Cause an allergic reaction in the patient.

• React with the anesthetic gases or agent to produce
dangerous by-products.

w To prevent incorrect values or equipment malfunction, use only

Datex-Ohmeda cables, hoses and tubing.

w

w

w

Desiccated absorbers can be hazardous in the presence of
anesthetic agents. Adequate precautions should be taken to
ensure that soda lime in absorbers does not become desiccated.
Turn off all gases when finished using the system.

This system operates correctly at the electrical interference levels
of IEC 60601-1-2. Higher levels can cause nuisance alarms that
may stop mechanical ventilation.

To help prevent false alarms from devices with high-intensity
electrical fields:

• Keep the electrosurgical leads away from the breathing
system and the flow and oxygen sensors.

• Do not put the electrosurgical leads on any part of the
anesthesia system.

1-2

w

To protect the patient when electrosurgical equipment is used:

1009-0633-000

Canister setup

ww

ww

• Monitor the correct operation of all life support and monitoring
equipment.

• Keep backup manual ventilation available in case the
electrosurgical equipment prevents safe use of the ventilator.

• Do not use conductive masks or hoses.

WARNING Obey applicable safety precautions:

1 Setup and Connections

w

w

w

w

w

w

Do not use the absorber with chloroform or trichloroethylene.

The Disposable Multi Absorber is a sealed unit which should not
be opened or refilled.

Avoid skin or eye contact with the contents of the absorber. In the
event of skin or eye contact, immediately rinse the affected area
with water and seek medical assistance.

Do not change the absorber during ventilation.

Inspect absorbent color at the end of a case. During non-use,
absorbent can go back to the original color. Refer to the absorbent
labeling for more information about color changes.

Desiccated (dehydrated) absorbent material may produce
dangerous reactions when exposed to inhalation anesthetics.

1009-0633-000

w

For systems with dual absorbent canisters, the carbon dioxide
absorbent material in both canisters shall be changed at least
weekly
systems the absorbent material shall be changed every day

, preferably every Monday morning. For single canister

,

preferably at the start of the day.

1-3

Aespire 7900

w

w

w

w

Carbon dioxide absorbent material shall be changed whenever
users cannot assure the degree of hydration of the absorbent.
Such conditions may include finding a machine with fresh gas
that has been flowing for an unknown period of time, or using a
machine that is used infrequently.

All fresh gas flows shall be terminated when the machine is NOT in
use. (User manuals describe how to achieve null flows).

Users are advised to consider the use of low-flow techniques
when the machine is in use

and whenever clinically appropriate to

maintain hydration of the absorbent material.

Always perform a breathing system leak test in the Bag Mode after
opening the absorber.

The absorber canister is available in two versions: Disposable Multi Absorber
and Reusable Multi Absorber. Both are removed and installed on the
breathing system in the same way.

When to change the

absorbent

Each canister holds 800 g of loose absorbent. Datex-Ohmeda recommends
Medisorb absorbent.

Both absorber versions should only be used with air, oxygen, nitrous oxide,
halothane, enflurane, isoflurane, desflurane and sevoflurane.

A gradual color change of the soda lime in the canister indicates absorption of
carbon dioxide. The color change of the soda lime is only a rough indicator.
Use carbon dioxide monitoring to determine when to change the canister.

Discard the absorbent when it has changed color. If left standing for several
hours, soda lime may regain its original color giving a misleading indication of
activity.

Read the canister instructions completely before using the product.

1-4

1009-0633-000

1 Setup and Connections

Removing a canister

The absorber canister is available in two versions: Reusable Multi Absorber
and Disposable Multi Absorber. Both are removed and installed on the
breathing system in the same way.

3

2

4

5

1

7

1. Disposable Multi Absorber canister

2. System canister release latch

3. System canister support pin

4. Canister handle

5. Absorbent

6. Reusable Multi Absorber canister

7. Water reservoir

Figure 1-1 • Canister

6

1009-0633-000

1-5

Aespire 7900

1. Hold the canister by the
handle and push on the
release latch (1) to unlock
the canister.

2. Remove the canister by
tilting it downward and off
the two support pins.

1

Reusable Multi

Absorber canister

filling

1. Turn the canister upside down and, using your thumbs, turn the cover
locking ring counterclockwise to unlock it.

2. Push up with your thumbs to release the seal.

3. Lift off the cover to remove it.

4. Remove and discard the foam filters
(1), the absorbent and any water in the
reservoir.

1-6

1

5. To clean and disinfect the canister, see “Absorber canister” in section 2
Cleaning and Sterilization.”

1009-0633-000

1 Setup and Connections

w WARNING

The filters must be in place to prevent dust and particles from
entering the breathing circuit.

6. When dry, place a new filter in the bottom of the canister, pour soda lime
into the canister and place a new filter over the soda lime before closing
and locking the cover. Wipe off any soda lime dust. Align the cover slots
with the canister locking tabs and press the cover down into place. Turn
the cover locking ring clockwise to lock the cover in place. Ensure cover is
properly sealed to prevent leaks and spillage. Alignment of the arrows
helps to indicate correct assembly.

7. When replacing the canister, make sure it is resting on both support pins
before latching it into place.

Pneumatic and electrical connections

w WARNING

Equipment connected to the electrical outlets can increase the
leakage current. Regularly test the leakage current.

An optional isolation transformer kit is available to reduce total leakage
current.

w CAUTION

Mains inlet

Outlets

Use only medical grade gas supplies. Other types of gas supplies
may contain water, oil, or other contaminants.

Arrow shows the mains power inlet and cord.

Labels show outlet voltage ratings and circuit breaker amp ratings.

1009-0633-000

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Aespire 7900

Pipeline Inlets

The gas supplies also supply these devices through internal connections:

• The venturi suction regulator (optional)

• The auxiliary O

• Ventilator drive gas

flowmeter (optional)

2

Serial port

RS-232C signal standards

The ventilator has an RS-232C electrical interface. The RS-232C connector
allows serial input/output of commands and data.

15-pin Female D connector - Data
Communications Equipment
configuration (DCE):

• Pin 1 - Monitor On/Stby

• Pin 5 - Signal ground

• Pin 6 - Receive data

• Pin 9 - Monitor On/Stby Rtn

• Pin 13 - Transmit data

How to install gas cylinders (high pressure leak test)

Pin indexed cylinder

1. Find the cylinder wrench.

1-8

yokes

1009-0633-000

1 Setup and Connections

2. Close the cylinder valve on the cylinder to be replaced.

3. Fully loosen the tee handle.

4. Open the cylinder yoke.

w WARNING

5. Remove the used cylinder and the used gasket.

6. Remove the cap from the cylinder valve on the new cylinder.

7. Point the cylinder outlet away from all items that can be damaged by a
release of high pressure gas.

8. Quickly open and close the cylinder valve. This removes dirt from the
cylinder outlet.

No gasket or more than one gasket can cause a leak.

9. Install a new gasket.

10. Align the cylinder post with the index pins.

1009-0633-000

11. Close the yoke gate and tighten the tee handle.

12. Install a cylinder plug and gasket in all empty cylinder yokes.

13. Do a high pressure leak test:

• Disconnect pipeline supplies.

1-9

Aespire 7900

• Turn off the auxiliary O

flowmeter and venturi suction.

2

• Set the system switch to Standby.

• Open the cylinder.

• Record the cylinder pressure.

• Close the cylinder.

• If the air or oxygen cylinder pressure decreases more than 5000 kPa

(100 psi) in one minute, there is a significant leak.

• For N

O cylinders, a pressure decrease of 690 kPa (100 psi) in one

2

minute represents a significant leak.

To repair a leak:

• Install a new cylinder gasket and tighten the tee handle.

• Do this step again. If the leak continues, do not use the system.

wCAUTION 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.

DIN cylinder

1. Close the cylinder valve on the cylinder to be replaced.

connections

2. Loosen the adapter and remove the cylinder.

3. Remove the cap from the cylinder valve on the new cylinder.

4. Point the cylinder outlet away from all items that can be damaged by a
release of high pressure gas.

5. Quickly open and close the cylinder valve. This removes dirt from the
cylinder outlet.

6. Install the cylinder.

7. Do a high pressure leak test:

• Disconnect pipeline supplies.

• Turn OFF the auxiliary flowmeter and the venturi suction.

• Set the system switch to Standby.

• Open the cylinder.

• Record the cylinder pressure.

• Close the cylinder.

1-10

1009-0633-000

wWARNING Do not leave gas cylinder valves open if the pipeline supply is in

Installation notes

1 Setup and Connections

• If the cylinder pressure decreases more than 5000 kPa (725 psi) for

O

and air in one minute, there is a significant leak.

2

• For N2O cylinders, a pressure decrease of 690 kPa (100 psi) in one

minute represents a significant leak.

To repair a leak:

• Install a new cylinder gasket and tighten the adapter.

• Do this step again. If the leak continues, do not use the system.

use. Cylinder supplies could be depleted, leaving an insufficient
reserve supply in case of pipeline failure.

When the system is installed, the Datex-Ohmeda representative will check the
following settings and change them if necessary.

wWARNING These settings can only be changed by qualified personnel.

• Language.

• Automatic calculation of VE alarm limits during mechanical ventilation.

• Altitude.

• Ventilator drive gas.

• User Select Defaults.

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Aespire 7900

How to attach equipment to the top shelf

wWARNING The top shelf has a weight limit of 34 kg (75 lb).

Place the equipment between the straps. Fold the straps over each other and
fully tighten and fasten them with the hook and loop surfaces.

wWARNING If you do not fully tighten the strap, equipment can fall off the

shelf.

1-12 1009-0633-000

2 Cleaning and Sterilization

In this section

Breathing system cleanable parts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-3

Special requirements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-4

How to clean and disinfect the flow sensors . . . . . . . . . . . . . . . . . . . . . . . . . 2-4

Remove the breathing system bag hose . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-6

Remove the breathing system . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-7

Disassemble the breathing system . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-8

Disassemble the Bellows assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-12

Assemble the Bellows assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-14

Bellows assembly tests . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-15

Assemble the breathing system . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-18

Install the breathing system . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-22

Remove the AGSS receiver . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-23

Remove the AGSS receiver filter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-24

Absorber canister . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-25

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w WARNING Obey applicable safety precautions:

• Read the material safety data sheet for each cleaning agent.

• Read the operation and maintenance manual for all
sterilization equipment.

• Wear gloves and safety glasses. A damaged O
leak and cause burns (contains potassium hydroxide).

• Do not breathe the fumes.

w CAUTION To help prevent damage:

• Refer to the manufacturer’s data if you have questions about a
cleaning agent.

• Do not use organic, halogenated, or petroleum based
solvents, anesthetic agents, glass cleaners, acetone, or other
harsh cleaning agents.

• Do not use abrasive cleaning agents (such as steel wool, silver
polish or cleaner).

• Keep all liquids away from electronic parts.

• Do not permit liquid to go into the equipment housings.

sensor can

22

22

2-2

• Do not soak synthetic rubber parts for more than 15 minutes.
Swelling or faster aging can occur.

• Only autoclave parts marked 134°C.

• Cleaning solutions must have a pH of 7.0 to 10.5.

1009-0633-000

Breathing system cleanable parts

1

2 Cleaning and Sterilization

2

3

8

4

7

5

6

1. Bellows assembly

2. APL Valve Ramp

3. APL Diaphragm

4. Breathing circuit module (O

5. Absorber canister (reusable only)

6. Flow sensor cover

7. Flow Sensor Module (plastic flow sensors not autoclavable)

8. Exhalation Valve assembly

sensor not autoclavable)

2

Figure 2-1 • Autoclavable assemblies

Parts marked 134°C are autoclavable or washable by hand or machine (mild
detergent pH <10.5). Rinse and dry completely. All parts except the O

sensor

2

and disposable flow sensors can be washed.

1009-0633-000

If the flow sensors are plastic, refer to the “How to clean and disinfect the flow

sensors” procedure. If metal, they can be autoclaved at 134°C.

2-3

Aespire 7900

Special requirements

• To clean the circuit O
sensor in liquid.

• To clean/disinfect metal or plastic flow sensors, use the flow sensor
cleaning procedures. Do not get the connectors wet.

• Disassemble the bellows assembly before you wash it. If not, it will take a
very long time to dry. Hang the bellows upside down (extended) to dry. If
not, the convolutions can stick together.

• Assemble the bellows assembly before you autoclave. Autoclave the
bellows assembly upside down.

sensor, wipe it with a damp cloth. Do not put the

2

w WARNING Do not use talc, zinc stearate, calcium carbonate, corn starch or

equivalent materials to prevent tackiness. These materials can go
into the patient’s lungs and airways and cause irritation or injury.

w CAUTION

w

w

Do not put the circuit O

Do not autoclave the circuit O

Do not clean the interior surfaces of the flow sensors. Use a damp cloth
on external surfaces only.

sensor or flow sensor connector in liquid.

2

sensor or the plastic flow sensors.

2

Inspect all parts for deterioration. Replace them if necessary.

The “Preoperative Tests” section in Part 1 of the User Reference Manual tells
you how to test the system for correct operation.

How to clean and disinfect the flow sensors

w CAUTION Do not autoclave plastic flow sensors.

w Do not use high pressure gas or brushes to clean the flow sensors.

w Do not use cleaning solvents that are not approved for use with

polycarbonates (e.g. CIDEX Plus).

CIDEX sterilization

Both Datex-Ohmeda and the manufacturer of CIDEX (Johnson & Johnson)
have tested this procedure.

• CIDEX must be 14 day mixture, with activator vial (REF reorder #2245).

2-4

1009-0633-000

2 Cleaning and Sterilization

• One liter of this solution cleans four (4) flow sensors.

Procedure

1. Pull the latch to unlock the flow sensor module from the breathing
system.

2. Pull the flow sensor module from the breathing system.

3. Remove the flow sensors from the module.

• Completely loosen the thumbscrew (1).

• Pull off the flow sensor cover (3) from the flow sensor holder (2).

• Remove the flow sensor connectors (4) from the flow sensor holder.

• Pull the flow sensors (5) from the flow sensor holder.

1

4

2 3

5

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2-5

Aespire 7900

4. Submerge the flow sensor and
tubes in activated CIDEX
solution. Keep the connector dry.

5. Keep the solution in the tubes for
the sterilization period.

6. Submerge the flow sensor and
tubes in distilled water. Again, do
not get the connector wet.

7. Rinse as indicated in CIDEX
instructions.

8. Do steps 6 and 7 again to remove
all CIDEX.

9. COMPLETELY dry the flow
sensor and the tubes before
you use the sensor. Use a
dry syringe or connect
vacuum or pressure to
remove all liquid from the
sensor (sensor, tubes, and
connector):

w CAUTION Dry for > 1 min with these precautions:

• Maximum flow 10 L/min

• Maximum pressure ±100 cmH

10. Reverse steps 2 and 3 to reassemble the flow sensor module. Be sure to
align the flow sensor tubes with the grooves in the flow sensor holder.

11. Before you use the system, complete the “ Preoperative Tests ” in section
4 of the User Reference Manual, Part 1.

Remove the breathing system bag hose

1. Disconnect the bag hose (1)
from the bag hose connector
(2). Also remove the hose
from the clip (3).

2. If bag arm option is present,
remove the bag port elbow
from the bag arm support.
Push down on the release
latch and slide the bag port elbow out of the holder.

O

2

1

3

2

2-6

1009-0633-000

Remove the breathing system

1. Hold the canister (2) by the handle
and push on the release latch (1)
to unlock the canister.

2. Remove the canister by tilting it
downward and off the two support
pins.

3. Push the release
button (3) and
gently pull the
latch handle (4)
to release the
breathing
system.

2 Cleaning and Sterilization

1

2

3

4

4. Lightly grasp the rear handle (5) to support the breathing system. Slide
the breathing system away from the workstation pulling with the latch
handle.

5

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Aespire 7900

Disassemble the breathing system

The breathing system assembly can be disassembled for cleaning,
sterilization and part replacement.

1. Remove the breathing system and place on a flat surface.

2. Pull the latch to unlock the flow sensor module from the breathing
system.

3. Pull the flow sensor module from the breathing system.

4. Unscrew the sensor counterclockwise and remove it. To remove the
sensor cable from the breathing system, press on the connector button
(1) while pulling the connector out.

1

2-8

1009-0633-000

2 Cleaning and Sterilization

5. Remove the flow sensors from the module:

• Completely loosen the thumbscrew (1).

• Pull off the cover (2) from the Flow Sensor Holder (3).

• Remove the flow sensor connectors (4) from the Flow Sensor Holder.

• Pull the flow sensors (5) from the Flow Sensor Holder.

1

2 3

4

5

6. Rotate the breathing circuit module at the point shown by the dotted line.

1009-0633-000

7. After rotating, separate the two sections by pulling them apart.

2-9

Aespire 7900

1

8. On the manifold assembly, remove the check valves circuit lens (1) by
squeezing the latches (2) together and pulling up on the lens.

2

9. Press at (2) to unlock the ramp (1). Rotate the ramp and remove the tabs
from the slots (3) to remove the ramp.

10. Lift the diaphragm to remove it.

1

2

3

2-10

1009-0633-000

2 Cleaning and Sterilization

11. Turn over the bellows base assembly, grasp the bellows boot with three
fingers in the openings at the points shown and pull straight away to
remove it.

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2-11

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12. With the breathing system removed, the exhalation valve assembly can
be removed for cleaning if desired. Loosen the two thumbscrews
indicated and lift the assembly off.

Disassemble the Bellows assembly

The bellows assembly can be disassembled for cleaning, sterilization, and
part replacement.

1. Turn the housing counter-clockwise and lift.

2. Remove the bottom edge of the bellows from the rim.

2-12

1009-0633-000

2 Cleaning and Sterilization

3. Push the latch toward the center and remove the rim.

4. Remove the pressure-relief valve.

w WARNING Do not disassemble the pressure relief valve. This can damage the

seat or diaphragm and cause injury to the patient.

5. Push the latch toward the center and remove the locking tabs.

6. Remove the seal.

1009-0633-000

2-13

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Assemble the Bellows assembly

1. Install the seal. Verify the arrow on the seal points up.

2. Push the latch toward the center and attach the locking tabs.

3. Install the pressure-relief valve.

4. Push the latch toward the center and install the rim. Verify you hear a
double-click when you install the rim.

2-14

1009-0633-000

2 Cleaning and Sterilization

5. Attach the bottom edge of the bellows to the rim. Verify only the bottom
ring of the bellows is fitted over the rim.

6. Lower the housing and turn it clockwise to lock. Verify you cannot lift off of
the housing.

Bellows assembly tests

w WARNING Objects in the breathing system can stop gas flow to the patient.

7. In the above steps, if you see a dust-like powder on the bellows housing
or on the bellows, apply a thin layer of KRYTOX lubricant to the ribs of the
bellows housing. Make sure the lubricant is applied smoothly and there
are no lumps.

8. Perform the Bellows assembly tests before completing the assembly of
the breathing system.

This can cause injury or death:

• Do not use a test plug that is small enough to fall into the
breathing system.

• Make sure that there are no test plugs or other objects caught
in the breathing system.

1009-0633-000

w The bellows assembly test does not replace the preoperative

tests. Always complete the tests in the section Preoperative tests
before you use the system with a patient.

2-15

Aespire 7900

This test makes sure that all components are correctly assembled. It is not an
alternative to a complete system checkout.

If the bellows assembly operates correctly, complete the assembly of the
breathing system.

If there is a problem, disassemble the bellows assembly. Look for and replace
damaged parts.

1. Hold the bellows assembly vertical and close the ports (1 and 2).

2

1

2. Invert the bellows assembly. The bellows must not fall within one minute.
If it does:

• The ports are not tightly sealed.

• The bellows is incorrectly installed.

• The seal inside the bellows is not correctly installed (with its groove

pointed up).

• Parts are damaged.

1

2

2-16

1009-0633-000

2 Cleaning and Sterilization

3. Remove the plugs from the ports. Permit the bellows to fully extend.

4. Close port 3.

3

5. Hold the bellows assembly upright. The bellows must not fall past the
guide line within one minute. If it does:

• The port is not tightly sealed.

• The bellows or the pressure relief valve is not correctly installed.

• Parts are damaged.

3

1009-0633-000

2-17

Aespire 7900

6. If the result for all the bellows assembly tests was “passed,” complete the
assembly of the breathing system.

Assemble the breathing system

1. Replace the exhalation valve assembly as shown. Tighten the two
thumbscrews.

2. Turn over the bellows base assembly. Replace the boot. Be sure to insert
it correctly into the ports as shown by the arrows. Then, press on the
center of the boot (arrow) to snap it into place on the bellows base
assembly.

2-18

1009-0633-000

2 Cleaning and Sterilization

3. Replace the diaphragm.

4. Insert the ramp tabs (1) into the slots (2). Rotate the ramp until it locks at
(3).

1

2

3

5. On the manifold assembly, press the check valves circuit lens (1) down
onto the latches (2) to lock the lens.

1

1009-0633-000

2

2-19

Aespire 7900

6. Insert the breathing circuit module into the bellows assembly aligned as
shown.

7. Rotate the breathing circuit module at the point shown by the dotted line
to attach it to the bellows assembly.

8. Make sure the o-ring (3) is on the O
screwing it in clockwise. Replace the O

sensor. Replace the sensor (1) by

2

sensor cable connector (2).

2

1

2

9. Attach the flow sensors to the module:

• Insert the flow sensors (1) into the flow sensor holder. Note the

groove locations.

• Attach the flow sensor connectors (2) to the flow sensor holder.

• Attach the cover (4) to the flow sensor holder (3).

• Tighten the thumbscrew (5) to fasten the cover.

3

2-20

1009-0633-000

2 Cleaning and Sterilization

2

1

3

4

5

10. Attach the flow sensor module to the breathing system.

11. Push the latch (1) to lock the flow sensor module onto the breathing
system.

1009-0633-000

1

2-21

Aespire 7900

12. This is assembled breathing system.

Install the breathing system

1. Locate guide pin openings 1 and 2.

1

2. Align opening 1 onto the guide pin 1, then align opening 2 onto guide pin

2.

12

2

2-22

1009-0633-000

2 Cleaning and Sterilization

3. Holding the rear handle (1) and the latch handle (2) as shown, slide the
breathing system onto the guide pins.

1

4. Use the grip under the latch handle to push the breathing system in fully
until it latches firmly.

5. Install the absorber canister and bag hose.

6. Before you use the system, complete the “Preoperative Tests” in section
4 of the User Reference Manual, Part 1.

2

Remove the AGSS receiver

The AGSS receiver may be removed for cleaning and sterilization.

1. On the back of the system, loosen the two thumbscrews (1) to release the
system side panel (2).

2

1

1009-0633-000 2-23

Aespire 7900

2. Slide the side panel out by removing its tabs from their slots (1).

1

3. Loosen the thumbscrew and remove the reservoir (2). It is not
autoclavable.

2

4. Loosen the thumbscrew (1) and lower the receiver to remove it.

1

5. Replace the filter as necessary. (See following steps.)

6. Do these steps in the opposite order to replace the receiver and the side
panel.

7. Before you use the system, complete the “Preoperative Tests” in section
4 of the User Reference Manual, Part 1.

Remove the AGSS receiver filter

The AGSS receiver may be autoclaved. To autoclave AGSS receivers which
have a filter, the filter must be removed because it is not autoclavable.

2-24 1009-0633-000

1. Pull the flexible gasket (1) from the receiver.

1

2. Pull the filter (1) out of its holder (2).

2

1

2 Cleaning and Sterilization

Absorber canister

wCAUTION The filters must be in place to prevent dust and particles from

3. Do these steps in the opposite order to replace the filter and gasket after
autoclaving the receiver and gasket. Be sure the gasket is firmly pressed
into place at all points.

4. Before you use the system, complete the “Preoperative Tests” in section
4 of the User Reference Manual, Part 1.

The absorber canister is available in two versions: Disposable Multi Absorber
and Reusable Multi Absorber. Both are removed and installed on the
breathing system in the same way.

Refer to “Removing a canister” in section 1 “Setup and Connections”.

Only the Reusable Multi Absorber canister may be cleaned.

entering the breathing circuit.

1009-0633-000 2-25

Aespire 7900

Mechanical cleaning in

washer or washer-

disinfector

Manual cleaning 1. Flush the canister and the lid with fresh running water.

1. Place the canister without filters and the lid in the washer or washer­disinfector and clean them with a decontaminating program.

2. Dry the canister and the lid in a warming closet, maximum 80°C (176°F)
or at room temperature.

3. If the washer or washer-disinfector is not used for disinfection of
equipment, Datex-Ohmeda recommends that a further high level
disinfection is conducted.

4. When dry, place a new filter in the bottom of the canister, pour soda lime
into the canister and place a new filter over the soda lime before closing
and locking the cover. Wipe off any soda lime dust.

5. Align the cover slots with the canister locking tabs, and press the cover
down into place. Turn the cover locking ring clockwise to lock the cover in
place. Ensure cover is properly sealed to prevent leaks and spillage.
Alignment of arrows helps to indicate correct assembly.

2. Clean the canister and lid under total immersion in a sink with water and
cleaning agent for at least 3 minutes. The water temperature should be
approximately 40°C (104°F).

3. Flush the canister and lid with fresh running water.

4. When dry, place a new filter in the bottom of the canister, pour soda lime
into the canister and place a new filter over the soda lime before closing
and locking the cover. Wipe off any soda lime dust.

5. Align the cover slots with the canister locking tabs, and press the cover
down into place. Turn the cover locking ring clockwise to lock the cover in
place. Ensure cover is properly sealed to prevent leaks and spillage.
Alignment of arrows helps to indicate correct assembly.

6. Datex-Ohmeda recommends that manual cleaning is always followed by
a high level disinfection.

High level disinfection 1. Always clean the canister before high level disinfection.

2. The canister can be steam autoclaved. Maximum recommended
temperature is 134°C (273°F).

3. When dry, place a new filter in the bottom of the canister, pour soda lime
into the canister and place a new filter over the soda lime before closing
and locking the cover. Wipe off any soda lime dust.

4. Align the cover slots with the canister locking tabs, and press the cover
down into place. Turn the cover locking ring clockwise to lock the cover in
place. Ensure cover is properly sealed to prevent leaks and spillage.
Alignment of arrows helps to indicate correct assembly.

2-26 1009-0633-000

3 User Maintenance

w WARNING To help prevent fires:

• Only use lubricants approved for anesthesia or O

equipment,

2

such as Krytox.

• Do not use lubricants that contain oil or grease. They burn or
explode in high O

concentrations.

2

• All covers used on the system must be made from antistatic
(conductive) materials. Static electricity can cause fires.

w WARNING Obey infection control and safety procedures. Used equipment

may contain blood and body fluids.

w WARNING Movable part and removable components may present a pinch or

a crush hazard. Use care when moving or replacing system parts
and components.

In this section

Repair policy . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-2

Maintenance summary and schedule . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-2

Breathing system maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-4

1009-0633-000

sensor replacement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-4

O

2

sensor calibration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-5

O

2

Flow sensor zeroing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-11

How to prevent water build-up . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-12

3-1

Aespire 7900

Repair policy

Do not use malfunctioning equipment. Make all necessary repairs or have the
equipment serviced by an authorized Datex-Ohmeda service representative.
After repair, test the equipment to ensure that it is functioning properly, in
accordance with the manufacturer’s published specifications.

To ensure full reliability, have all repairs and service done by an authorized
Datex-Ohmeda service representative. If this cannot be done, replacement
and maintenance of those parts listed in this manual may be undertaken by a
competent, trained individual having experience in the repair of devices of this
nature.

w CAUTION No repair should ever be attempted by anyone not having

experience in the repair of devices of this nature.

Replace damaged parts with components manufactured or sold by Datex­Ohmeda. Then test the unit to ascertain that it complies with the
manufacturer’s published specifications.

Contact your local Datex-Ohmeda Field Service Representative for service
assistance. In all cases, other than where Datex-Ohmeda’s warranty is
applicable, repairs will be made at Datex-Ohmeda’s current list price for the
replacement part(s) plus a reasonable labor charge.

Maintenance summary and schedule

These schedules are the minimum frequency based on typical usage of 2000
hours per year. You should service the equipment more frequently if you use it
more than the typical yearly usage.

User maintenance

Minimum
Frequency

Daily

Weekly

Maintenance

• Clean the external surfaces.

• 21% O

• Flow sensor zeroing.

calibration (circuit O

2

sensor).

2

3-2

Two weeks

• Drain the vaporizers and discard the agent.
This is not necessary for Tec 6 vaporizers.

1009-0633-000

3 User Maintenance

Minimum
Frequency

Maintenance

Monthly

During cleaning
and setup

Annually

As necessary

• 100% O

calibration (circuit O

2

sensor).

2

• Put Krytox (or a lubricant approved for use with 100%
O

) on all tee handle threads.

2

• Inspect the parts for damage. Replace or repair as
necessary.

• Replace the external o-rings on the vaporizer ports.

• Install new cylinder gaskets on cylinder yokes.

•Empty the water reservoir and replace the absorbent
in the canister.

•Empty the overflow trap on the optional suction
regulator.

• Replace the circuit O

sensor.

2

(Under typical use the sensor meets specifications for
1 year.)

• Replace the disposable flow sensors (plastic).
(Under typical use the sensor meets specifications for
a miminum of 3 months.)

• Replace the autoclavable flow sensors (metal).
(Under typical use the sensor meets specifications for
a minimum of 1 year.)

• Replace the receiver filter (active gas scavenging
only).

1009-0633-000

Datex-Ohmeda

approved

service

Minimum
Frequency

12 months Have a qualified service person complete the scheduled

Planned Maintenance

service maintenance checks, tests, calibrations and parts
replacement as defined in the service manual.

::

NNNNooootttteeee::

This is the minimum level of maintenance recommended by
Datex-Ohmeda. Local regulations may contain additional
maintenance requirements. Datex-Ohmeda advocates
compliance with local regulations which meet or exceed this
minimum level of maintenance.

3-3

Aespire 7900

Breathing system maintenance

When cleaning the breathing system, replace any parts that are visibly
cracked, chipped, distorted or worn.

Refer to the appropriate section for reassembly and tests.

O

sensor replacement

2

w WARNING Handle and dispose of sensors according to your biohazard

policies. Do not incinerate.

1. Pull the latch (1) to unlock the flow sensor module from the breathing
system.

1

2. Pull the flow sensor module from the breathing system.

3. Remove the O
unscrew the sensor counterclockwise. Don’t lose the sensor o-ring.

sensor cable connector (2) from the O

2

sensor (1) and

2

1

2

3-4

1009-0633-000

3 User Maintenance

4. Make sure the o-ring (1) is on the sensor. Install the replacement O
sensor. Reconnect the O

5. Replace the flow sensor module on the system and press the latch (1) in
to secure the module.

sensor cable.

2

1

1

2

O

sensor calibration

2

w WARNING Do not perform calibration while unit is connected to a patient.

21% O

sensor

2

calibration

w The O

sensor must be calibrated at the same environment

2

pressure at which it will be used to monitor oxygen delivery in the
patient circuit.

w Operation at pressures other than the pressures present during

calibration may result in readings outside of the stated monitoring
accuracy.

This procedure takes three minutes or less.

You must do the 21% O
calibration the screen replaces O

calibration before the 100% O

2

data with ---- --

2

--

.

calibration. During O

2

2

1009-0633-000

3-5

Aespire 7900

Step 1

Push the Menu key to see
the main menu.

Step 2

Turn the knob to select the
Calibration screen.

Step 3

Push the knob to show the
next screen.

Step 4

Turn and push the knob to
select O

Sensor Cal.

2

Step 5

Select 21% then push the
knob.

3-6

1009-0633-000

Step 6

Complete the steps shown
on the screen.
To remove the O

from the circuit:

sensor

2

• Pull the latch (1) to
unlock the flow
sensor module from
the breathing
system.

3 User Maintenance

1

• Pull the flow sensor
module (2) from the
breathing system.

• Remove the O

2

sensor (3) and leave
it exposed to room
air.

2

3

1009-0633-000

3-7

Aespire 7900

Step 7

Select Start Cal and push
the knob to start calibration.

• The screen shows

After a successful calibration, the screen shows “Complete” and a flashing “Reinstall Sensor”.

After installing the sensor, you can continue to 100% calibration (step 11) or exit to the normal screen (step 7).

“ CCCCaaaalllliiiibbbbrrrraaaattttiiiinnnngg

gg

” during

the procedure.

An unsuccessful calibration shows “ FFFFaaaaiiiilllluuuurrrree

ee

”. If the calibration fails:

• Do the calibration again.

• If it still fails, do a 100% O

sensor calibration (step 11). If 100% O

2

at 21% again.

• After repeated failures, replace the O

Step 8

To exit, select “Go to Cal
Menu” and push the knob.
You can also press
the menu key to exit to
the normal screen.
Select “Go to Main Menu”
and push the knob.

Step 9

Select “Exit to Normal
Screen” and push the knob.

2

sensor and re-calibrate at 21%.

2

Go to Main Menu

Exit to Normal Screen

sensor calibration passes, calibrate

3-8

Step 10

If you are not doing the 100% calibration which follows, do a breathing circuit leak test before using the system.

1009-0633-000

3 User Maintenance

100% O

sensor

2

calibration

w WARNING Do not perform calibration while unit is connected to a patient.

Step 11

Turn then push the knob to
select O

Step 12

Select 100% then push the
knob.

Sensor Cal.

2

This procedure takes three minutes or less.

You must complete the 21% calibration before you can select the 100%
calibration.

Step 13

With the O
circuit, fill the circuit with

100% O

sensor in the

2

:

2

• Push the flush
button.

•

Then

flow 100% O

5 L/min. (Circuit should
be open.)

Step 14

Select Start Cal. Then push
the knob to start calibration.

at

2

1009-0633-000

3-9

Aespire 7900

The screen shows ‘Calibrating ... ‘, followed by the result: ‘Complete’ or ‘Failure’.
If the calibration fails,

• do it again or

• decrease the airway pressure. Then try again.

After repeated failures replace the O
Continue with steps 14 through 16 to exit to a normal screen.

Step 15

To exit, select “Go to Cal
Menu” and push the knob.
You can also press
the menu key to exit to
the normal screen

Step 16

Select “Go to Main Menu”
and push the knob.

sensor and re-calibrate at 21%.

2

Go to Cal Menu

Go to Main Menu

Step 17

Select “Exit to Normal
Screen” and push the knob.

Step 18

Do a breathing circuit leak test before using the system.

Exit to Normal Screen

3-10

1009-0633-000

Flow sensor zeroing

wWARNING Do not perform calibration while unit is connected to a patient.

3 User Maintenance

The system automatically corrects for zero offset when you unplug the flow
sensor connectors with power on. You must stop mechanical ventilation
before you calibrate the flow sensors.

Note: Properly performing the O2 cell zeroing will also zero the flow sensor.

Step 1

Pull the latch (1) to unlock the
flow sensor module from the
breathing system.

Step 2

Pull the flow sensor module from
the breathing system.

Step 3

When zeroing is complete, the
screen shows, “No Insp flow
sensor” and “No Exp flow
sensor.”

1

NNNNoooo IIIInnnnsssspppp FFFFlllloooowwww SSSSeeeennnnssssoooorr
NNNNoooo EEEExxxxpppp FFFFlllloooowwww SSSSeeeennnnssssoooorr

rr

rr

Step 4

Install the flow sensor module.

Step 5

Do a breathing circuit leak test before using the system. Refer to “Breathing system tests” in section 4 Preoperative Tests of the
User Reference Manual, Part 1.

1009-0633-000

3-11

Aespire 7900

How to prevent water build-up

Why is water buildup a

problem?

How much water is

acceptable?

Where does the water

come from?

Solutions: •Empty the water reservoir in the canister when changing the soda lime.

Pooled water in the flow sensor or water in the sensing lines causes false
alarms.

Small beads of water or a foggy appearance in the flow sensors is OK.

Water comes from exhaled gas and a chemical reaction between CO2 and the
absorbent in the absorber.

At lower fresh gas flows more water builds up because less gas is scavenged
and:

• More CO

• More moist, exhaled gas stays in the absorber.

• Ensure that water condensing in the breathing circuit tubes is kept lower
than the flow sensors and is not allowed to drain into the flow sensors.

stays in the absorber to react and produce water,

2

•Water condensation in the breathing circuit tubing can be eased using a
Heat & Moisture Exchange (HME) filter at the airway connection.

3-12 1009-0633-000

4 Alarms and Troubleshooting

w CAUTION No repair should ever be attempted by anyone not having

experience in the repair of devices of this nature.

In this section

About alarms . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-2

Alphabetical list . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-4

Breathing system problems (no alarm) . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-13

Electrical problems (power failure, etc.) . . . . . . . . . . . . . . . . . . . . . . . . . . .4-14

Pneumatic problems . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4-16

Alarm settings range and default values . . . . . . . . . . . . . . . . . . . . . . . . . . .4-17

1009-0633-000

4-1

Aespire 7900

About alarms

w WARNING If an alarm occurs, safeguard the patient first, before

troubleshooting or repair procedures.

Two areas on the screen show alarms. The area at the top of the display shows
most alarms. If there are more than 4 alarms at the same time, the lower
priority alarms cycle every two seconds.

During severe malfunctions that prevent mechanical ventilation and/or
monitoring, the area under the waveform shows minimum system messages.
During normal operation, this area shows instructions (push the knob, etc.).

Alarms

Alarm priority depends on the level of danger to the patient. High priority
alarms require immediate attention.

Priority Alarm tone Alarm silence Note

High 10 tones,

10 second pause,
repeat

Medium 3 tones,

25 second pause,
repeat

Low Single tone Tone does not repeat ---

120 seconds or cannot
be silenced

120 seconds ---

Reverse video

AB.90.025

4-2

4 Alarms and Troubleshooting

Alarm messages have three general causes.

• Malfunctions: Some malfunctions cause reduced function (for example,
no PEEP). Others prevent mechanical ventilation (Minimum shutdown).

• Patient monitoring: These are high and low limit settings that you adjust.

• Informational: Control settings or system conditions can change
operation. For example, if the audible circuit leak alarm is Off, the screen
shows “Circuit Leak Audio Off” as a low priority alarm.

1009-0633-000

4-3

Aespire 7900

Alphabetical list

The instructions in this section tell you what you can do:

• During a case to protect the patient

• After the case to repair a problem

This table does not include operator instructions.

There are two special types of alarms:

• Minimum monitoring alarms stop mechanical ventilation.

• Minimum shutdown alarms stop mechanical ventilation and monitoring.

Message Priority Cause Action/Concerns Repair

+15V Analog Out-of­Range

-15V Analog Out-of­Range

12 Hour Test Low System in use for more than

A/D Converter
Failure

Absorber panel open Medium The top panel is not

Adjust Low Ve Limit Medium The audible circuit leak

Min. shutdown
(High)

Min. shutdown
(High)

Min. shutdown
(High)

Ventilator malfunction. Ventilate manually. Monitoring is

Ventilator malfunction. Ventilate manually. Monitoring is

12 hours without a power-up
self test.

Ventilator malfunction. Ventilate manually. Monitoring is

completely closed.

alarm is Off (Alarm menu)
but the low VE alarm is not
set.

VE alarm is Off in SIMV or
PSVPro modes.

Contact a qualified

not reliable.

not reliable.

To do the test, move the system
switch from Standby to On.

not reliable.

Push the breathing system into
the frame and ensure it latches.

Increase the low VE alarm limit. - - -

service representative.

Contact a qualified
service representative.

Not necessary,
informational.

Contact a qualified
service representative.

- - -

Apnea Alarm
Standby

Apnea Alarm Off Low The cardiac bypass option is

4-4

Low Normal condition after End

Case, power-up, or ACGO
change from On to Off

selected (alarm limit menu).

Monitoring resumes after first
breath (mechanical) or 2 breaths
within 30 seconds (non­mechanical).

Apnea alarms are normally
turned off when this option is
selected.

- - -

- - -

4 Alarms and Troubleshooting

Message Priority Cause Action/Concerns Repair

Aux Gas Outlet On Medium

(low after
acknowledged)

The outlet selection switch is
set to the auxiliary common
gas outlet.

Backup Mode Active Low SIMV-PC + PSV mode

entered.

Battery Charger Fail Low The current in the battery

charging circuit is too high.

Battery Charging Low The battery is not fully

charged. If power fails, the
total backup time will be less
than 30 minutes.

Battery Current High Low Battery current >

6

amps

for

10 seconds.

Battery Failure High Low Battery voltage > 16 V for 10

seconds.

Connect the patient circuit to the
auxiliary outlet. For mechanical
ventilation or manual ventilation
with monitoring, select the
breathing system.

Spontaneous breath rate fell
below the set breath rate

The system is operational, but
may fail later depending on what
caused this alarm.

Leave the system plugged in to
charge the battery.

The system continues to operate,
but may fail.

The system continues to operate,
but may fail.

- - -

- - -

Contact a qualified
service representative.

- - -

Contact a qualified
service representative.

Contact a qualified
service representative.

Battery Failure Low Low The battery voltage is too low

(<7 V) to supply the system if
power fails.

Cal Flow Sensors Low The last flow sensor

calibration failed.

Calibrate O2 Sensor Low O

%>110% Does the sensor measure 21%

2

Cannot Drive Bellows Low The internal manifold

pressure is higher than Paw
+ tolerance.

Cardiac Bypass Low The alarm limit settings are

set for a patient on cardiac
bypass. Apnea alarms are
off.

The battery does not have
enough charge to power the
equipment if power fails.
Leave the system plugged in to

If the battery does not
charge in 24 hours,
contact a service
representative.

charge the battery.

Calibrate the flow sensors. Look
for water in the flow sensor

Contact a qualified
service representative.

tubes. Dry if necessary.

Calibrate O

O

in room air?

2

Fill the bellows if empty. - - -

Use the alarm limits menu to

- - -

change this setting.

sensor.

2

1009-0633-000

4-5

Aespire 7900

Message Priority Cause Action/Concerns Repair

Check Flow Sensors Medium

(low after
acknowledged)

Circuit Leak Audio

Low Control setting on the Alarm

Off

Connect O

Sensor Low The O

2

CPU Failure Minimum

shutdown (High)

CPU Internal Error Minimum

shutdown (High)

Display Voltage Out­Of-Range

Minimum
shutdown (High)

No flow or negative flow on
inspiratory sensor during

Are the flow sensors correctly

installed?
inspiration in a circle system
or negative flow on
expiratory sensor in

Water build-up in the flow sensor

tubes?
expiration (for 6 breaths in a
row).

Is a flow sensor tube cracked or

broken?

This message tells you that the
limit menu.

audio alarm for circuit leaks was

turned off.

sensor is not

2

Connect the sensor. Contact a qualified
connected to the cable.

Ventilator malfunction. Ventilate manually. Monitoring is

not reliable.

Ventilator malfunction. Ventilate manually. Monitoring is

not reliable.

Ventilator malfunction. Ventilate manually. Monitoring is

not reliable.

Inspect one way valves
(breathing circuit
module).

Replace flow sensor
module. Check the
condition of the flow
sensor and its tubing.

- - -

service representative
to replace the cable.

Contact a qualified
service representative.

Contact a qualified
service representative.

Contact a qualified
service representative.

Exp Flow Sensor Fail Low The system cannot read the

calibration data stored in the
sensor.

Exp Reverse Flow Medium

(low after
acknowledged)

Flow Valve (DAC)
Failure
Flow Valve (current)

Minimum
monitoring
(Medium)

Flow through the expiratory
sensor during inspiration (for
6 breaths in a row).

Ventilator malfunction. Ventilate manually. Monitoring is

Failure

Gas Inlet Valve
Failure

Hardware Watchdog
Failure

Minimum
shutdown (High)

Minimum
shutdown (High)

Ventilator malfunction. Ventilate manually. Monitoring is

a

Ventilator malfunction. Ventilate manually. Monitoring is

Operation continues with default

values.

Replace the flow sensor.

Look at the check valves.

Water build-up in the flow sensor

tubes?

Is a flow sensor tube cracked or

broken?

still available.

still available.

not reliable.

- - -

Replace the expiratory
check valve.

Check the condition of
the flow sensor.

Contact a qualified
service representative.

Contact a qualified
service representative.

Contact a qualified
service representative.

4-6

4 Alarms and Troubleshooting

Message Priority Cause Action/Concerns Repair

High O

2

Medium O

% > alarm high limit

2

setting.

High Paw High Paw is greater than Plimit.

The ventilator cycles to
expiration.

High Ve Medium The minute volume is greater

than the set high limit. This
alarm is suspended for 9
breaths or one minute after
you change the ventilator
settings.

High Vte Medium VTE is greater than high

alarm limit. This alarm is
suspended for 9 breaths
after you change the
ventilator settings.

Is the limit set correctly? What is

the O

flow?

2

Did you just push Flush? Does

the sensor see 21% O

in room

2

air?

Are Plimit and other controls set

correctly? Look for blockages.

Check the patient connection.

Check patient for spontaneous

breathing. Adjust control

settings.

Check patient for spontaneous

breathing. Check ventilator and

alarm settings.

Calibrate O
Replace O

sensor.

2

sensor.

2

Calibrate the flow
sensors.
Replace the receiver
filter.

- - -

- - -

Insp Flow Sensor Fail Low The system cannot read the

calibration data stored in the
sensor.

Inspiration Stopped High Drive gas safety switch

activated (high internal
pressure)

Insp Reverse Flow Medium

(low after
acknowledged)

Internal Ventilator
Clock Too Fast

Internal Ventilator
Clock Too Slow

Invalid Circuit

Minimum
shutdown (High)

Minimum
shutdown (High)

Low Ventilator malfunction. Ventilate manually; monitoring is

Flow through the inspiratory
sensor during expiration (for
6 breaths in a row).

Ventilator malfunction. Ventilate manually. Monitoring is

Ventilator malfunction. Ventilate manually. Monitoring is

Module

Operation continues with default

values.

Replace the flow sensor.

Adjust controls. Check systems

for blockages.

Look at the check valves.

Water build-up in the flow sensor

tubes?

Is a flow sensor tube cracked or

broken?

not reliable.

not reliable.

not reliable.

- - -

- - -

Replace the inspiratory
check valve.

Check the condition of
the flow sensor.

Contact a qualified
service representative.

Contact a qualified
service representative.

Contact a qualified
service representative

1009-0633-000

4-7

Aespire 7900

Message Priority Cause Action/Concerns Repair

Limit Task Light Use Low The system is running on

battery power. Turn off the
light to save power.

Loss of Backup
Audio

Medium
(low after

The audio alarm will not
sound for a CPU failure.

acknowledged)

Low Battery Voltage Medium Voltage is <11.65V while

using battery power.

Low Drive Gas Pres Medium The ventilator did not detect

a rise in internal pressure
when the flow valve opened.

Low O

2

High O

% < alarm low limit setting Is the limit set correctly? Is the

2

Turn off the light to extend

- - -

battery backup.

Monitor system operation. Contact a qualified

service representative.

Manually ventilate the patient to

save power.

Make sure power is
connected and circuit
breakers are closed.
Contact a qualified
service representative.

Manually ventilate the patient. Make sure that the

appropriate gas
supplies (O

or Air) are

2

connected and
pressurized.

O

flow sufficient? Does the

2

sensor see 21% O

in room air?

2

Calibrate O
Replace O
sensors wear out, the

measured % O

sensor.

2

sensor. As

2

2

decreases.

Low Paw Medium Paw does not rise at least 4

cm from the lowest pressure
measured during the last 20
seconds.

Low Ve Medium Exhaled minute volume <low

limit alarm setting. This
alarm is suspended for 9
breaths or one minute after
you change the ventilator
settings.

Low Vte Medium Exhaled tidal volume <low

limit alarm setting. This
alarm is suspended for 9
breaths after you change the
ventilator settings.

Manifold Pressure
Sensor Failure

Minimum
monitoring

Ventilator malfunction. Ventilate manually. Contact a qualified

(Medium)

Are circuit connections OK? Look

at the Paw gauge on the

absorber.

Check patient condition. Check

tubing connections.

Check alarm settings.

Check patient condition. Check

tubing connections. Check alarm

settings.

Look for circuit
disconnection.

- - -

- - -

service representative.

4-8

4 Alarms and Troubleshooting

Message Priority Cause Action/Concerns Repair

Memory (EEPROM)
Fail

The system cannot access
some stored values.

Default settings are used.

Ventilation is still possible but

Contact a qualified
service representative.

service is necessary.

Memory (flash)
Failure

Memory (RAM)
Failure

Memory (Redundant
Storage) Fail

Minimum
shutdown (High)

Minimum
shutdown (High)

Minimum
monitoring

Ventilator malfunction. Ventilate manually. Monitoring is

not reliable.

Ventilator malfunction. Ventilate manually. Monitoring is

not reliable.

Ventilator malfunction. Ventilate manually. Monitoring is

still available.

Contact a qualified
service representative.

Contact a qualified
service representative.

Contact a qualified
service representative.

(Medium)

Memory (video)
Failure

Monitoring Only Medium A severe malfunction

Minimum
shutdown (High)

Ventilator malfunction. Ventilate manually. Monitoring is

not reliable.

Ventilate manually. Cycle system
prevents mechanical
ventilation. Other alarms
may also occur.

power (On- Standby-On). If the

alarm clears, restart mechanical

ventilation.

Contact a qualified
service representative.

Contact a qualified
service representative.

No Circuit Module Low Ventilator malfunction. Ventilate manually. Optical sensors look for

tabs on the back of the
module. Is the module
assembled? are the
sensors dirty?

No CO

Absorption Medium

2

No Exp Flow Sensor

No Insp Flow Sensor

No message, only
specific shutdown
message

No O

Pressure High

2

The absorber canister is

(low after
acknowledged)

open (out of the circuit) but
the bypass mechanism
prevents a leak (optional
feature).

Medium
(low after
acknowledged)

Electrical signals show the
flow sensor is not
connected.

High A severe malfunction

prevents mechanical
ventilation and monitoring.
Other alarms may also
occur.

The O

supply has failed. Air flow will continue. Ventilate

2

(cannot be
silenced)

User setting. Reinstall the

absorber canister to remove CO

from exhaled gas

Connect the flow sensors. Make

sure the flow sensor module is

on all the way.

Ventilate manually. Use a stand-

alone monitor. Cycle system

power (On- Standby-On). If the

alarm clears, restart mechanical

ventilation.

manually if necessary. Connect a

pipeline supply or install an O

2

cylinder.

- - -

2

- - -

Contact a qualified
service representative

- - -

1009-0633-000

4-9

Aespire 7900

Message Priority Cause Action/Concerns Repair

O

Flush Failure Low The pressure switch that

2

detects flush flow has seen a
very long flush (≥30
seconds).

O

Sensor out of

2

Low Ventilator malfunction. Ventilate manually. Contact a qualified

circuit

This alarm occurs if you hold

down the Flush button for more

than 30 seconds.

If the alarm occurs
when flush is not in
use, contact a qualified
service representative.

service representative.

On Battery - Power
OK?

Medium
(low after
acknowledged)

The mains supply is not
connected or has failed and
the system is using battery
power.

Patient Circuit Leak? Medium Exhaled volume <50% of

inspired volume for at least
30 seconds (mechanical
ventilation).

Paw < -10 cmH

O High Subatmospheric pressure

2

(<-10 cmH

O).

2

PEEP Not Achieved Low Pmin does not reach within

±

2 cmH

O of PEEP by the

2

end of mechanical
expiration for 6 consecutive
breaths.

Positive SIB Vref Out­of- Range

Minimum
shutdown (High)

Ventilator malfunction. Ventilate manually. Monitoring is

Ventilate manually to save

power. At full charge, the battery

permits approx. 30 minutes of

mechanical ventilation.

Check breathing circuit and flow

sensor connections.

Check patient condition,

spontaneous activity? Increase

fresh gas flow. Look for high flow

through gas scavenging.

Check tubing connections. Rate

and/or I:E ratio may prevent

ventilator from reaching desired

PEEP level.

not reliable.

Make sure power is
connected and circuit
breakers are closed.

- - -

Calibrate the flow
sensors.

b

With active
scavenging, check the
negative relief valve on
the receiver.

- - -

Contact a qualified
service representative.

Pres Mode Not Avail Medium

(Pressure,
PSVPro and SIMV
modes)

Low (Volume
mode)

Pres/Vol Mon

Medium Outlet selection switch is set

Inactive

4-10

Manifold pressure not
tracking airway pressure, or
manifold pressure
≤ -15 cmH

O.

2

to auxiliary gas outlet.

Pressure control mode and PEEP
are not available. Switch to
Volume mode or ventilate
manually.

Check patient for spontaneous
breathing.
Check ventilator settings.

Connect the patient circuit to the
auxiliary gas outlet or set the
switch to the circle breathing
system.

Contact a qualified
service representative.

- - -

4 Alarms and Troubleshooting

Message Priority Cause Action/Concerns Repair

Pressure Limit Switch
Failure

Replace O

Sensor Low O

2

Minimum
monitoring
(Medium)

A pressure safety switch
activated at a Paw <90
cmH

O and Pmanifold <80

2

cm H

O.

2

% < 5% Makes sure patient receives O

2

Select Gas Outlet Medium Fresh gas may not flow to the

patient. Auxiliary gas outlet
is On, but flow sensors have
seen 3 breaths in patient
circuit during the last 30
seconds.

Service Calibration Low Internal calibrations are

necessary for maximum
accuracy.

Software Error Minimum

Ventilator malfunction. Ventilate manually. Monitoring is

shutdown (High)

Ventilate manually. Monitoring is
still available. Extreme control
combinations may cause this
alarm.
Check control settings.

.

2

Does the sensor see 21% O

in

2

room air? Use different monitor.

Select the circle breathing
system or connect the patient
circuit to the auxiliary outlet.

The system is operational.
Operation continues with default
values.

not reliable.

Contact a qualified
service representative.

Calibrate O
Replace O

sensor.

2

sensor.

2

Note: the bag arm will

not ventilate a patient
at the auxiliary outlet.

Contact a qualified
service representative.

Contact a qualified
service representative.

Software Watchdog
Failure

Sustained Airway
Pressure

Minimum
shutdown (High)

Minimum
shutdown (High)

Ventilator malfunction. Ventilate manually. Monitoring is

Paw > 100 cmH

O for 10

2

seconds.

Sustained Paw High Paw > sustained pressure

limit for 15 seconds

c

.

System Leak? Medium Delivered volumes do not

match set volumes.

Vaux_ref Out-of­Range

Vext_ref Out-of­Range

Minimum
shutdown (High)

Minimum
shutdown (High)

Ventilator malfunction. Ventilate manually. Monitoring is

Ventilator malfunction. Ventilate manually. Monitoring is

not reliable.

Check tubing for kinks,
blockages, disconnects.

Check tubing for kinks,
blockages, disconnects.

Look for leaks in the breathing
system. Compare set to
delivered volumes.

not reliable.

not reliable.

Contact a qualified
service representative.

Calibrate the flow
sensors.

Calibrate the flow
sensors.

Calibrate the flow
sensors.
Drain water buildup
from the breathing
system.

Contact a qualified
service representative.

Contact a qualified
service representative.

1009-0633-000

4-11

Aespire 7900

Message Priority Cause Action/Concerns Repair

Volume Apnea Medium No mechanical breaths or

spontaneous breaths >20
mL in last 30 seconds.

Check patient. Bag as needed.
Check for disconnects. If the
patient is on a heart lung

- - -

machine, select Cardiac Bypass
on the main menu.

Vol Apnea > 2 min High No mechanical breaths or

See above. - - ­spontaneous breaths >20
mL in last 120 seconds.

Vt Not Achieved Low Tidal volume measured by

inspiratory flow sensor
< set value 6 breaths in a

Adjust controls to supply

adequate tidal volumes. Check

I:E; Plimit; and volume settings.

Possible leak.

row after the first minute of
mechanical ventilation.

Vte > Insp Vt Medium Expired volume > inspired

Check patient condition. - - ­volume for 6 breaths with a
circle breathing system.

a. When power is first turned on.

b. Flow sensors are also used to measure pressures.

c. The sustained pressure threshold is calculated from the pressure limit setting. When mechanical ventilation is

on, the sustained limit is calculated as follows: for pressure limits < 30 cmH
cmH

O; for Plimit between 30 and 60 cmH

2

pressure limits > 60 cmH

O, the sustained pressure limit is 12 cmH

2

are on, the sustained pressure limit increases by PEEP - 2 cmH

O, the sustained limit is 20% of the pressure limit (Plimit); for

2

O. If both PEEP and mechanical ventilation

2

O (the compensated weight of the bellows).

2

O, the sustained pressure limit is 6

2

When mechanical ventilation is off, the sustained pressure limit is calculated as follows: for pressure limits ≤ 60
cmH

O, the sustained pressure limit is 50% of the pressure limit (Plimit); for pressure limits > 60 cmH

2

sustained pressure limit is 30 cmH

O.

2

O, the

2

4-12

Breathing system problems (no alarm)

Symptom Problem Solution(s)

Gas scavenging flow is too low. Suction supply problem. Use a different suction supply.

Filter blockage. Active systems
have a flow indicator to show
this.

The bellows fills when the Bag/Vent
switch is set to Bag or the bag fills
when the switch is set to Vent.

The ventilator does not read the
position of the Bag/Vent switch. Use
manual ventilation, if necessary.

APL valve does not operate correctly. APL valve problem Replace APL Valve seal and

Leak through Bag/Vent switch. Ask a qualified service

Ventilator or absorber
malfunction.

4 Alarms and Troubleshooting

Replace the filter. Refer to
“Remove the AGSS receiver
filter” in section 2, “ Cleaning and

Strerilization” .

representative to repair the
system.

Ventilate manually. Ask a
qualified service representative
to repair the system.

diaphragm - Refer to User
Maintenance

1009-0633-000

4-13

Aespire 7900

Electrical problems (power failure, etc.)

w WARNING

If a circuit breaker opens frequently, do not use the system. Have a
qualified service representative repair the system

Symptom Problem Solution

Mains indicator is not ON. The electrical power cable

is not connected.

The inlet circuit breaker
(toggle switch) is open.

The power cable is
damaged.

The electrical socket the
power cable connects to
has no power.

An internal fuse is open. Have a qualified service

One electrical outlet does not
have power.

The outlet circuit breaker is
open.

Connect the power cable.

Close the circuit breaker
(Figure 4-1).

Replace the power cable.

Use a different electrical
socket.

representative repair the
system.

Close the circuit breaker.

.

A circuit breaker opens
frequently.

Tec 6 Plus vaporizer has no
power.

The ventilator does not correctly
identify the breathing circuit
module.

Equipment connected to
the outlet(s) (figure 4-1)
uses more current than the
circuit breaker rating.

The equipment connected
to the outlet has a short.

Not plugged into outlet. Connect power cable.

Ventilator malfunction. Ask a qualified service

Use a different power supply
for some of the equipment.

Do not use the equipment
until it is repaired.

representative to repair the
system.

4-14

4 Alarms and Troubleshooting

1

4

5

2

1. Inlet Circuit Breaker*

2. Mains Indicator

3. Outlet CIrcuit Breakers*

4. Open (No power)

5. Closed (OK)

3

* Labels show ratings.

Figure 4-1 • Circuit breakers and the mains indicator

1009-0633-000

4-15

Aespire 7900

Pneumatic problems

Symptom Problem Solution

High-pressure leak test
fails.

Low-pressure leak test
fails with a vaporizer on.

Controls are not set correctly. Set the system switch to

Standby and the auxiliary
flowmeter to OFF.

Incorrect cylinder connection (cylinder
yokes).

Incorrect cylinder connection (DIN
connection.)

The vaporizer is not correctly installed. Correctly install the

The vaporizer filler is loose (fill port type
vaporizer).

Vaporizer port o-rings (external) are damaged
or not installed.

A vaporizer malfunction (the leak stops if you
use a different vaporizer in the same
position).

A port valve malfunction (the leak continues
if you use a different vaporizer in the same
manifold position).

Make sure that there is only
one cylinder gasket, the
gasket is in good condition,
and the T- handle is tight.

Make sure the nut is tight.

vaporizer.

Tighten the filler.

Install new o-rings.

Send the vaporizer to a
Datex-Ohmeda Service
Center for repair.

Have an qualified service
person repair the vaporizer
manifold.

4-16

Low-pressure leak with a
vaporizer OFF.

Anesthesia machine problem. Contact a qualified service

representative.

w CAUTION No repair should ever be attempted by anyone not having

experience in the repair of devices of this nature.

Alarm settings range and default values

Setting Range Increment Default

4 Alarms and Troubleshooting

Low O

2

High O

)21-99%, Off 1% Off

2

Low VE Off, 0.1-10 L/min 0.1 L/min 2.0 L

High VE 0.5-30, off L/min 0.5 L/min 10.0 L

Low VTE Off, 5-1500 mL 5 mL if <20 mL,

High VTE 20 - 1600 mL, off 20 mL 1000 mL

Circuit leak Audio on or Audio off n/a Audio on

Cardiac bypass No or In Progress n/a No

18-99% 1% 21%

Off

20 otherwise

1009-0633-000

4-17

Aespire 7900

4-18

5 Parts

In this section

This section lists user-replaceable parts only. For other components, refer to
the Technical Reference manual.

Flow sensor module . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5- 2

Breathing circuit module . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5- 3

Bellows . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5- 4

Absorber canister . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5- 5

Exhalation valve assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5- 6

AGSS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5- 7

Test tools and system parts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5- 8

1009-0633-000

5-1

Aespire 7900

Flow sensor module

1

3

2

AB.82.019

Item Description Stock number

Flow sensor module (does not include flow sensors) 1407-7001-000
1 Flow sensor cover 1407-3000-000
2 Flow sensor cuff 1407-3004-000
3 Flow sensor, disposable (plastic) 1503-3856-000

Flow sensor, autoclavable (metal) 1503-3244-000

5-2

1009-0633-000

Breathing circuit module

5 Parts

1

2

3

4

5

AB.82.021

Item Description Stock number

Breathing circuit module (does not include O

cell,

2

140 7-7002-000

O-ring, or cable)
1 Check valves circuit lens 1407-3101-000
2 Check valve assembly 1406-8219-000
3 O-ring for O

4O

cell 6050-0004-110

2

5 Cable, O

– Plug (without O

cell 1406-3466-000

2

cell 1009-5570-000

2

sensing) 1407-3111-000

2

– O-ring for plug 1407-3112-000

1009-0633-000

5-3

Aespire 7900

Bellows

1

2

8

7

Item Description Stock number

1 Bellows housing 1500-3117-000
2 Bellows 1500-3378-000
3 Rim 1500-3351-000
4Pressure relief valve assembly 1500-3377-000
5 Latch, rim 1500-3352-000
6 Manifold, bellows base 1407-3702-000
7 Bellows base with latch 1407-7006-000
8 Seal, base 1500-3359-000
– Diaphragm, APL 1406-3331-000
–Poppet, APL valve 1406-3332-000
– Cage, APL 1406-3333-000

3

4
5

6

AB.82.018

5-4

1009-0633-000

Absorber canister

5 Parts

2

3

1

3

4

5

AB.82.017

Item Description Stock number

1 Multi absorber, reusable (includes 40 pack of foam)

140 7-7004-000

(does not include absorbent)
2Cover assembly, CO

3 Foam, CO

canister (pack of 40) 1407-3201-000

2

canister 1009-8240-000

2

4 O-ring 1407-3204-000
5 Canister, CO

– Multi absorber, disposable, white to violet,

, with handle 1407-3200-000

2

8003138

(pack of 6)
– Multi absorber, disposable, pink to white, (pack of 6) 8003963

1009-0633-000

5-5

Aespire 7900

Exhalation valve assembly

AB.82.035

Description Stock number

Exhalation valve assembly 1407-7005-000

5-6

1009-0633-000

AGSS

5 Parts

Description Stock number

Common

Cap 3.18 barb silicone 1406-3524-000
Connector, inlet 30 mm male to 19 mm male M1003134
Connector, inlet 30 mm male to 30 mm male M1003947
O-ring for connector, 21.95 ID 1406-3558-000
O-ring for receiver, 22 ID 1407-3104-000
O-ring for thumbscrews, 4.47 ID 1407-3923-000
Reservoir scavenger 1407-3903-000
Seal, down tube scavenger 1407-3904-000
Seal, receiver scavenger 1407-3901-000
Thumbscrew M6 X 28.5 1406-3305-000
Thumbscrew, M6 X 43 1406-3304-000
Valve, unidirectional (complete assembly) 1406-8219-000

Passive AGSS

Adapter, outlet 30 mm female to 19 mm male (pack of 5) 1500-3376-000
Exhaust hose 8004461
Plug assembly 30 mm ISO 1407-3909-000
Screw, shoulder 4 dia X 4 L M3 X 0.5 sst 1407-3915-000

Active AGSS, adjustable flow

Bag with 30 mm male connector 8004460
Plug assembly 30 mm ISO 1407-3909-000

Active AGSS, high flow

Filter, 225 micrometer nylon screen AGSS 1406-3521-000
Seal, filter scavenger 1407-3902-000

Active AGSS, low flow

Filter, 225 micrometer nylon screen AGSS 1406-3521-000
Seal, filter scavenger 1407-3902-000

1009-0633-000

5-7

Aespire 7900

Test tools and system parts

Description Stock number

Cylinder gasket (pin indexed cylinders only) 0210-5022-300
Cylinder wrench (DIN 477 and high-pressure hose) 1202-3651-000
Cylinder wrench for pin-indexed cylinder 0219-3415-800
DIN O

Handle for yoke tee 0219-3372-600
Krytox 1001-3854-000
Negative low pressure leak test device 0309-1319-800
Positive low pressure leak test device (BSI) 1001-8975-000
Positive low pressure leak test device (ISO) 1001-8976-000
Positive pressure leak test adapter 1009-3119-000
Ring, sealing gasket (for DIN 477 and O

Ring, sealing gasket (for N

Test lung 0219-7210-300
Test plug 2900-0001-000
Touch-up paint, Neutral Gray N7 (Medium Dark), 18 ml 1006-4198-000
Touch-up paint, Neutral Gray N8 (Medium), 18 ml 1006-4199-000
Touch-up paint, Neutral Gray N9 (Light), 18 ml 1006-4200-000
Vaporizer port o-rings, external (6 pack) 1102-3016-000
Yoke plug 0206-3040-542

plug (cylinder connection) 1202-7146-000

2

high-pressure hose) 1001-3812-000

2

O high-pressure hose) 1202-3641-000

2

5-8

1009-0633-000

6 Specifications and

Theory of Operation

In this section

::

NNNNooootttteeee::

All specifications are nominal and subject to change without notice.

System pneumatic circuits . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-2

System specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-5

Electrical power . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-6

Electromagnetic compatibility . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-8

Physical specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-15

Environmental requirements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6-15

Breathing system specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6-16

Ventilator theory . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6-18

Ventilation operating specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6-23

Ventilator accuracy data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6-26

Suction regulators (optional) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6-28

1009-0633-000

Auxiliary O

flowmeter (optional) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6-28

2

6-1

Aespire 7900

System pneumatic circuits

57

61

60

62

59

63

64

PPPP

69 70
68

DPL

S

67

71

66

28

27

29

42

58

30

43

31

44

45

32

2

47

46

15

34

33

65

48

16

49

35

17

18

50

51

36

38

19

54

52

20

37

25

53

55

P

56

41

39

40 40

26

6-2

P

5

3

4

1

3

P

1414

P

3

676

9

8

3

P

3

P

14

Figure 6-1 • Pneumatic circuit diagram

10

P

3

12

11

3

13

P

1009-0633-000

6 Specifications and Theory of Operation

Figure 6-1 legend

1. Auxiliary O

2. O

2

, 0-10 LPM (optional)

2

flush

3. Gauge

4. O

P-Line

2

5. 110 psi relief

6. Venturi

7. Vent drive

8. Air P-line (optional)

9. 110 psi relief

10. Air cylinder (optional)

O pipeline (optional)

11. N

2

12. 110 psi relief

13. N

O cylinder (optional)

2

cylinder (optional)

14. O

2

15. 0 - 120 L/min flow

16. System switch

17. NC

18. NO

19. 30 psi

supply switch

20. O

2

21. -

22. -

23. -

24. -

25. Link 25

26. Flowmeter module (dual tubes
optional)

27. Atmosphere

28. Free breathing check valve

29. Vaporizer

30. Mechanical overpressure valve (110

O)

cm H

2

31. Drive gas check valve

32. Inspiratory flow control valve

33. Gas inlet valve

34. 25 psi @15 LPM

35. Vent to ambient

36. Balance regulator

37. Link 25

38. Air (optional)

39. Selectatec manifold

40. Vaporizer

41. 5.5 psi pressure relief valve

42. Popoff valve

43. Exhalation valve (2.0 cm H

44. 10 cm H

O

2

O bias)

2

45. 0-10 LPM drive gas, 0-10 LPM patient
and fresh gas, 0-20 LPM total typical
flow

46. 200 mL reservoir

47. Negative pressure relief valve

48. Control bleed to ambient
approximately 1.0 L/min at 0.29 kPa
(3.0 cm H

O) if continuous (rate

2

dependent

49. Absorber

50. 5.4 psi O

flush switch

2

51. NO

52. NC

53. ACGO selector valve

sensor

54. O

2

55. ACGO

56. Airway pressure gauge

57. APL valve 0-70 cm H

O

2

58. Bag

59. Expiratory flow sensor

60. (Optional)

61. To scavenging

62. Gas monitor

63. Patient

64. Inspiratory flow sensor

65. -

66. Manifold pressure transducer

67. Drive pressure limit switch

68. Expiratory flow transducer

69. Inspiratory flow transducer

70. Paw transducer

71. Enhanced sensor interface board

1009-0633-000

6-3

Aespire 7900

Gas supplies

Gas goes into the system through a pipeline or cylinder connection. All
connections have indexed fittings, filters, and check (one-way) valves. Gauges
show the cylinder and pipeline pressures.

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.

w 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.

O

flow

2

Pipeline or regulated cylinder pressure supplies O
(O

Ventilator).

2

The flush valve supplies high flows of O

to the fresh gas outlet when you push

2

directly to the ventilator

2

the flush button. The flush switch uses pressure changes to monitor the
position of the flush valve. A message on the ventilator tells you when Flush is
ON.

Air and N

When the system switch is ON, O
minimum flow through the O

A secondary regulator supplies a constant O

flows to the rest of the system and there is a

2

flowmeter.

2

pressure to the flow control

2

valve.

An electrical switch monitors the O

supply pressure. If the pressure is too low,

2

an alarm appears on the ventilator.

O

2

A balance regulator controls the flow of N

O to the flow control valve. Oxygen

2

pressure at a control port adjusts the output of the regulator. This stops flow
during an O
decrease with the O

supply failure and ensures that the hypoxic gas pressures

2

supply pressure. Changes in O

2

pressure do not affect

2

Air.

A chain linkage on the N

O and O

2

flow controls helps keep the O

2

2

concentration higher than approximately 21% at the fresh gas outlet.

Pipeline or regulated cylinder pressure directly supply Air to the ventilator (Air
Ventilators). When the system switch is ON, air flows to the rest of the system.
Because there is no balance regulator, air flow continues at the set rate during
an O

supply failure.

2

6-4

1009-0633-000

O

O

O

6 Specifications and Theory of Operation

Mixed gas

System specifications

Pneumatic

Gas supplies

The mixed gas goes from the flowmeter outlet through the vaporizer that is ON,
to the fresh gas outlet, and into the breathing system. A pressure relief valve
sets the maximum outlet pressure.

PPPPiiiippppeeeelllliiiinnnneeee ggggaaaasssseeeess

CCCCyyyylllliiiinnnnddddeeeerrrr ggggaaaasssseeeess

CCCCyyyylllliiiinnnnddddeeeerrrr ccccoooonnnnnnnneeeeccccttttiiiioooonnnnss

PPPPrrrriiiimmmmaaaarrrryyyy rrrreeeegggguuuullllaaaattttoooorrrr oooouuuuttttppppuuuutttt
pppprrrreeeessssssssuuuurrrree

ss

ss

O

, Air, N

2

2

O

, N

O, Air (maximum: 2 cylinders of each gas); 1

2

2

cylinder max. on pendant model; 3rd cylinder is N

O

2

only

ss

Pin indexed (all gases); nut and gland DIN 477 (O
Air); large cylinder kit available for O

• Pin indexed: The primary regulator is set to pressure

ee

less than 345 kPa (50 psi).

and N

2

, N

O,

2

2

2

• DIN-477: The primary regulator is set to pressure
less than 414 kPa (60 psi)

PPPPrrrreeeessssssssuuuurrrreeee rrrreeeelllliiiieeeeffff vvvvaaaallllvvvvee

PPPPiiiippppeeeelllliiiinnnneeee ccccoooonnnnnnnneeeeccccttttiiiioooonnnnssss

))

((((ffffiiiilllltttteeeerrrreeeedddd))

ee

Approximately 758 kPa (110 psi)

DISS-Male; DISS-Female; AS 4059 (Australian); S90­116 (French Air Liquide); BSPP 3/8 (Scandinavian) or
NIST (ISO 5359). All fittings available for O

ss

Color coded gauges

ee

280-600 kPa (41-87 psi)

ACGO Port relief

PPPPrrrreeeessssssssuuuurrrreeee ddddiiiissssppppllllaaaayyyyss

PPPPiiiippppeeeelllliiiinnnneeee iiiinnnnlllleeeetttt pppprrrreeeessssssssuuuurrrree

Valve limits fresh gas pressure to 35 kPa (5.5 psi) at the flush flow.

w CAUTION All gases supplied to the system must be medical grade.

Flow

Flow rates: Minimum O

Gas

O

2

N

O 0.05 -0.95 L/min

2

Scale
(two flow tubes)

0.05 -0.95 L/min
1-15 L/min

1-10 L/min

flow: 25 to 75 mL/min.

2

Note: The link system
sets the nominal O

25% of the total O
N

O flow.

2

flow

2

and

2

, Air, and N

2

2

1009-0633-000

6-5

Aespire 7900

IEC-60601-1 Clasification

Gas

Air 0.05 -0.95 L/min

Accuracy: At 20

Scale
(two flow tubes)

1-15 L/min

° C with gas supply pressures at 345 kPa (50 psi) and an

outlet pressure of 101.3 kPa (absolute) (14.7 psi) flowmeter accuracy agrees
with VDE 3513 Part 3, Accuracy Class 2.5 or better.

Different breathing circuit pressures, barometric pressures or temperatures
change the accuracy. With some conditions, these changes can be larger than
the tolerances.

Flush flow: 25-75 L/min.

supply failure alarm and shutoff:

O

2

OO

OO

ssssuuuuppppppppllllyyyy ffffaaaaiiiilllluuuurrrreeee aaaallllaaaarrrrmmmm::

22

22

NN

NN

OOOO sssshhhhuuuuttttooooffffffff::

22

22

::

OO

OO

PPPPrrrreeeessssssssuuuurrrreeee::

22

22

::

193 to 221 kPa (28 to 32 psi)

3.5 kPa (0.5 psi)

::

The S/5 Aespire is classified as follows.

• Class I Equipment

• Type B Equipment

• Ordinary Equipment

• Not for use with flammable anesthetics

• Continuous operation

• Steam autoclavable or disinfectable per recommendations (see section
2 “Cleaning and Sterilization” .

Electrical power

6-6

Supply voltage: 100-120 or 220-240 Vac

± 10% at 50 or 60 Hz.

Inlet Circuit Breakers:

100-120 Vac 220-240 Vac

15A 8A

Outlet Circuit Breakers:

100-120 Vac 220-240 Vac Japan

(3) 2A
(1) 3A

(3) 1A
(1) 2A

(2) 2A
(1) 4A

System leakage current limit - do not exceed:

• UL and CSA rated systems (USA and Canada): <300 µamps for the
system and all systems connected to electrical outlets.

• IEC rated systems (Not USA and Canada): <500 µamps for the system
and all systems connected to electrical outlets.

1009-0633-000

6 Specifications and Theory of Operation

Note Products connected to the electrical outlets may increase the leakage current

above these limits.

w WARNING The connection of equipment to the auxiliary mains electrical

outlet(s) may increase the patient leakage currents to values
exceeding the allowable limits in the event of a defective earth
conductor.

Resistance to ground: <0.2 Ω

Power cord

Length: 5 meters

Voltage rating: 90 to 264 Vac

Current capacity: 10 A for 220-240 Vac

15 A for 100-120 Vac

w WARNING Use the battery if the integrity of the protective earth conductor is

Battery information

Type: Three conductor power supply cord (medical grade

where required).

in doubt.

The system is not a portable unit; a sealed lead acid battery supplies battery
backup. Batteries are used as backup power in case of a power failure. Thus,
the battery is in a float charge state most of the time. Batteries meet the
following:

1. Capacity to operate for 90 minutes under typical operating conditions;
30 minutes under extreme conditions.

2. Unit functions to specifications through the transition to battery power.

3. Long float charge life.

4. Battery pack has an auto-resettable thermal fuse.

5. Battery terminals and connecting wires are protected against short
circuits.

Only Datex-Ohmeda service representatives are to replace the battery.
Contact a Datex-Ohmeda service representative to disconnect the battery if
the equipment is not likely to be used for some time. Batteries must be
disposed of in accordance with applicable regulatory requirements in effect at
the time and place of disposal.

1009-0633-000

6-7

Aespire 7900

Electromagnetic compatibility

Changes or modifications to this equipment not expressly approved by Datex­Ohmeda could cause EMC issues with this or other equipment. Contact Datex­Ohmeda for assistance. This device is designed and tested to comply with
applicable regulations regarding EMC as follows.

w WARNING Use of portable phones or other radio frequency (RF) emitting

equipment near the system may cause unexpected or adverse
operation. Monitor operation when RF emitters are in the vicinity.

• Use of other electrical equipment on or near this system may
cause interference. Verify normal operation of equipment in
your configuration before use on patients.

The system provides connections for items such as printers, visual displays
and hospital information networks. When these items (non-medical
equipment) are combined with the S/5 Aespire, these precautions must be
followed:

• Don’t place items not approved to IEC 60601-1 closer than 1.5 m to the
patient.

• All items (medical electrical equipment or non-medical electrical
equipment) connected to the S/5 Aespire by a signal input/signal output
cable must be supplied from an AC power source which uses a separating
transformer (in accordance with IEC 60989) or be provided with an
additional protective earth conductor.

• If a portable multiple socket outlet assembly is used as an AC power
source, it must comply with IEC 60601-1-1. The assembly must not be
placed on the floor. Using more than one portable multiple socket outlet
assembly is not recommended.

Do not connect non-medical electrical equipment directly to the AC outlet at
the wall instead of an AC power source which uses a separating transformer.
Doing so may increase enclosure leakage current above levels allowed by IEC
60601-1 in normal conditions and under single-fault conditions. This may
cause an unsafe electrical shock to the patient or operator.

The S/5 Aespire provides multiple AC outlet sockets for connecting only other
medical electrical equipment. Do not connect non-medical electrical
equipment to these sockets. Doing so may increase enclosure leakage
current above levels allowed by IEC 60601-1 in normal conditions and under
single-fault conditions. This may cause an unsafe electrical shock to the
patient or operator.

6-8

After connecting anything to these outlets, conduct a complete system
leakage current test (according to IEC 60601-1).

1009-0633-000

6 Specifications and Theory of Operation

w WARNING An operator of the medical electrical system must not touch non-

medical electrical equipment and the patient simultaneously. This
may cause an unsafe electrical shock to the patient.

Guidance and

manufacturer's

The system is suitable for use in the specified electromagnetic environment.
The customer and/or the user of the system should assure that it is used in an
electromagnetic environment as described below.

declaration -

electromagnetic

emissions

Emissions test Compliance Electromagnetic environment guidance

RF emissions
CISPR 11

RF emissions
CISPR 11

Harmonic emissions
IEC 61000-3-2 Class A

Voltage fluctuations/
flicker emissions
IEC 61000-3-3

Immunity test IEC 60601-1-2 test level Compliance level Electromagnetic environment guidance

Electrostatic
discharge (ESD)
IEC 61000-4-2

Group 1 The system uses RF energy only for its internal function. Therefore, its RF emissions are

very low and are not likely to cause any interference in nearby electronic equipment.

Class B The system is suitable for use in all establishments, including domestic

establishments and those directly connected to the public low-voltage power supply

Class A

network that supplies buildings used for domestic purposes.

Complies

± 6 kV contact
± 8 kV air

± 6 kV contact
± 8 kV air

Floors should be wood, concrete, or ceramic tile. If
floors are covered with synthetic material, the
relative humidity should be at least 30 %.

Electrical fast
transient/burst IEC
61000-4-4

Surge IEC 61000­4-5

Voltage dips, short
interruptions and
voltage variations
on power supply
input lines
IEC 61000-4-11

1009-0633-000

± 2 kV for power supply
lines
±1 kV for input/output
lines

± 1 kV differential mode
±2 kV common mode

< 5 % UT (> 95% dip in U
for 0,5 cycle

40 % U

(60% dip in U

T

for 5 cycles
70 % U

(30% dip in U

T

for 25 cycles
< 5% U

(> 95 % dip in U

T

for 5 sec

± 2 kV for power supply
lines
±1 kV for input/output
lines

± 1 kV differential
mode
±2 kV common mode

)

< 5 % UT (> 95% dip in

T

U

) for 0,5 cycle

T

)

40 % U

T

)

T

)

T

(60% dip in

T

U

) for 5 cycles

T

70 % U

(30% dip in

T

U

) for 25 cycles

T

< 5 % U
U

T

) for 5 sec

T

(> 95% dip in

Mains power quality should be that of a typical
commercial and/or hospital environment.

Mains power quality should be that of a typical
commercial and/or hospital environment.

Mains power quality should be that of a typical
commercial and/or hospital environment. If the
user of the system requires continued operation
during power mains interruptions, it is
recommended that the system be powered from an
uninterruptible power supply or a battery.

6-9

Aespire 7900

Immunity test IEC 60601-1-2 test level Compliance level Electromagnetic environment guidance

Power frequency

3 A/m 3 A/m If display distortion or other abnormalities occur, it
(50/60 Hz)
magnetic field
IEC 61000-4-8 3
A/m

Note: U

is the AC mains voltage before application of the test level.

T

may be necessary to position the S/5 Aespire
Anaesthetic System further from sources of power
frequency magnetic fields or to install magnetic
shielding. The power frequency magnetic field
should be measured in the intended installation
location to assure that it is sufficiently low.

6-10

1009-0633-000

6 Specifications and Theory of Operation

Immunity test

Conducted RF
IEC 61000-4-6

Radiated RF
IEC 61000-4-6

IEC 60601-1-2
Test Level

3 Vrms
150 kHz to 80 MHz
outside ISM bands

10 Vrms
150 kHz to 80 MHz
in ISM bands

10 V/m 10 V/m (E1) D=1.2√P 80 mHz to 800 mHz

80 MHz to 2,5 GHz D=3.5√P 800 mHz to 2.5 GHz

Compliance
level

3 Vrms (V1) D=3.5√P

10 Vrms (V2) D=12√P

Electromagnetic environment
guidance

Portable and mobile RF communications equipment should be
used no closer to any part of the system, including cables, than the
recommended separation distance calculated from the equation
appropriate for the frequency of the transmitter.

Where P is the maximum output power rating of the transmitter in
watts (W) according to the transmitter manufacturer and D is the
recommended separation distance in meters (m).
Field strengths from fixed RF transmitters, as determined by an
electromagnetic site survey, should be less than the compliance
level in each frequency range.

Recommended separation distance

The ISM (industrial, scientific and medical) bands between 150 kHz and 80 MHz are 6,765 MHz to 6,795 MHz;
13,553 MHz to 13,567 MHz; 26,957 MHz to 27,283 MHz; and 40,66 MHz to 40,70 MHz.
The compliance levels in the ISM frequency bands between 150 kHz and 80 MHz and in the frequency range 80 MHz to 2,5 GHz
are intended to decrease the likelihood that a portable communications device could cause interference if it is inadvertently
brought into patient areas. For this reason, an additional factor of 10/3 is used in calculating the recommended separation
distance for transmitters in these frequency ranges.
Field strengths from fixed transmitters, such as base stations for radio (cellular/cordless) telephones and land mobile radios,
amateur radio, AM and FM radio broadcast, and TV broadcast cannot be predicted theoretically with accuracy. To assess the
electromagnetic environment due to fixed RF transmitters, an electromagnetic site survey should be considered. If the measured
field strength in the location in which the system is used exceeds the applicable RF compliance level above, the system should be
observed to verify normal operation. If abnormal performance is observed, additional measures may be necessary, such as re­orienting or relocating the system.
Over the frequency range 150 kHz to 80 MHz, field strengths should be less than 1 V/m.
Note: These guidelines may not apply in all situations. Electromagnetic propagation is affected by absorption and reflection from
structures, objects, and people.

1009-0633-000 6-11

Aespire 7900

Recommended

separation distances

Between portable and mobile

RF communications

equipment and the system

Separation distance in meters (m) according to frequency of the transmitter

Rated maximum

output power of

transmitter

W

0,01 0.35 1.2 0.12 0.23

0,1 1.1 3.8 0.38 0.73

1 3.5 12 1.2 2.3

10 11 38 3.8 7.3

150 kHz to

80 MHz

Outside ISM bands

35,

D

--------­V1

The system is intended for use in the electromagnetic environment in which
radiated RF disturbances are controlled. The customer or the user of the
system can help prevent electromagnetic interference by maintaining a
minimum distance between portable and mobile RF communications
equipment (transmitters) and the system as recommended below, according
to the maximum power of the communications equipment.

150 kHz to

80 MHz

In ISM bands

P=

12

D

------­V2

P=

80 MHz to

800 MHz

D

12

------­E1

800 MHz to

2,5 GHz

23

P=

D

------­E1

P=

100 35 120 12 23

For transmitters rated at a maximum output power not listed above, the recommended separation distance D in meters (m) can
be determined using the equation applicable to the frequency of the transmitter, where P is the maximum output power rating of
the transmitter in watts (W) according to the transmitter manufacturer.

Note 1: At 80 MHz to 800 MHz the separation distance for the higher frequency range applies.

Note 2: The ISM (Industrial, Scientific and Medical) bands between 150 kHz and 80 MHz are 6,765 MHz to 6,795 MHz; 13,553
MHz to 13,567 MHz; 26,957 MHz to 27,283 MHz; and 40,66 MHz to 40,70 MHz.

Note 3: An additional factor of 10/3 is used in calculating the recommended separation distance for transmitters in the ISM
frequency bands between 150 kHz and 80 MHz and in the frequency range 80 MHz to 2,5 GHz to decrease the likelihood that
mobile/portable communications equipment could cause interference if it is inadvertently brought into patient areas.

Note 4: These guidelines may not apply in all situations. Electromagnetic propagation is affected by absorption and reflection
from structures, objects, and people.

6-12 1009-0633-000

14

12

6 Specifications and Theory of Operation

10

11

9

4

8

7

6

5

1

2

3

17

15

13

34

36

35

29

28

16

26

27

30

18-21

22

24

31

32

23

Figure 6-2 • Electrical block diagram

25

33

1009-0633-000 6-13

Aespire 7900

Figure 6-2 legend

Inside Anesthesia System

1.

Power cord

2.

AC inlet with breaker and line filter

3.

Isolation transformer

4.

Inrush board

5.

Fuses

6.

Line filter

7.

Outlet box

8.

Universal power supply

9.

Battery, 12 V

10.

Integrated CPU board

11.

On/Standby switch

12.

O2 supply switch

13.

Task light switch

14.

Task light

15.

RS232 port

16.

Ventilator display module

17.

Display connector board

18.

EL display

19.

Keyboard membrane switch

20.

ComWheel

21.

Ventilator engine board

22.

Gas inlet valve

23.

Flow control valve

24.

Breathing system

25.

Bag/Ventilator switch

26.

ABS on switch

27.

Canister switch (optional)

28.

CO2 bypass switch (optional)

29.

Bulkhead connector

30.

Expiratory flow sensor

31.

Inspiratory flow sensor

32.

O2 sensor

33.

Enhanced sensor interface board

34.

ACGO select

35.

O2 flush switch

36.

6-14 1009-0633-000