Datex-Ohmeda Aespire 7900 User manual

Aespire 7900

User’s Reference Manual—Part 1

System Controls, Operation, Checkout

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 7are 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

1 Introduction

What is an Aespire 7900? . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-2

Symbols used in the manual or on the equipment . . . . . . . . . . . . . . . . . . . . 1-3

2 System Controls and Menus

Anesthesia system controls . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-2

Breathing system components . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-5

ACGO . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-8

Scavenging the ACGO sample flow . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-9

Scavenging from the external manual breathing circuit . . . . . . . . . . . 2-10

Vaporizer controls . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-10

Ventilator controls . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-12

Optional Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-12

Control panel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-12

How to set controls . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-14

How to use the menu . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-15

Menu map . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-16

More about menu functions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-17

How to change menu settings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-18

Optional auxiliary O2 flowmeter and suction regulators . . . . . . . . . . . . . . . 2-19

3 Operation and Tutorial

Pre-use check list . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-3

Turn On the system . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-4

Set the alarm loudness . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-5

Show or hide alarm limits and units . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-7

Turn the volume alarms on or off . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-8

Set alarm limits . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-8

Set an audible alarm for circuit leaks . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-10

Set Cardiac Bypass . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-11

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Start mechanical ventilation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	3-13
Stop mechanical ventilation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	3-14
Alarms . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	3-15
Alarm Tones . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	3-15
Alarm Silence . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	3-15
Alarm Suspend . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	3-15
Set the ventilation mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	3-16
Set ventilator controls . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	3-18
Optional features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	3-18
Ventilator controls . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	3-18
Volume Control mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	3-19
Pressure Control mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	3-20
SIMV mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	3-20
PSVPro mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	3-20
Set inspiratory pause (volume modes) . . . . . . . . . . . . . . . . . . . . . . . .	3-22
Set SIMV and PSVPro controls . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	3-24
Silence alarms . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	3-26
Reading the pressure waveform (Paw) . . . . . . . . . . . . . . . . . . . . . . . . . . . .	3-27
Scales . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	3-27
Measure circuit compliance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	3-30
Show the service settings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	3-31
Measure circuit compliance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	3-33

4 Preoperative Tests

Aespire 7900 Preoperative tests schedules . . . . . . . . . . . . . . . . . . . . . . . . . 4-2

Test Intervals . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-2

Test devices . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-3

Inspect the System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-4

Power failure alarm test . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-5

Minimize alarms (optional) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-5

Pipeline and cylinder tests . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-6

Flow control tests . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-7

Vaporizer installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-9

Vaporizer back pressure test . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-10

Low-pressure leak test . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-11

Negative low-pressure

leak test . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-11

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ISO 5358 or BSI standard positive low-pressure

leak test . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-13 Alarm tests . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-14 Breathing system tests . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-16 Monitor and ventilator tests . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-18

Index

Warranty

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1 Introduction

In this section What is an Aespire 7900? . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-2 Symbols used in the manual or on the equipment . . . . . . . . . . . . . . . . . . . . 1-3

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Aespire 7900

What is an Aespire 7900?

The Aespire 7900 is a compact, integrated and intuitive anesthesia delivery system. The ventilator portion provides mechanical ventilation for patients during surgery as well as monitoring and displaying various patient parameters.

The system uses a microprocessor-controlled ventilator with internal monitors, electronic PEEP, Volume Mode, and other optional features. A serial interface permits communication to cardiovascular and respiratory gas monitoring.

Illustrations in this manual may not cover all types of options available. Other equipment may be attached to the system on the top shelf or on the side dovetail rails. Consult with your Datex-Ohmeda representative for details about systems available in your location.

The Aespire 7900 is not suitable for use in an MRI environment.

Figure 1-1 • Aespire 7900 example

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1 Introduction

Symbols used in the manual or on the equipment

wWARNINGS and wCAUTIONS tell you about dangerous conditions that 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:

øOn (power)

O Off (power)

o Standby

qStandby or preparatory state for part of the equipment

p	“ON” only for part of the equipment
œ	“OFF” only for part of the equipment
†	Direct current
∏	Alternating current
x	Protective earth ground
y	Earth ground
r	Frame or chassis ground
å	Alarm silence button
Y	Equipotential
t	Variability

Í

m

µ

H

w wW

N

N

π

≈

REF

SN

R

Not autoclavable

Type B equipment

Type BF equipment

Type CF equipment

Caution, ISO 7000-0434

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

This way is up.

Dangerous Voltage

Input

Output

Stock Number

Serial Number

Bag position/ manual ventilation

Read top of float

T Variability in steps

Vacuum inlet

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Aespire 7900

+ Plus, positive polarity					Suction bottle outlet
-	Minus, negative polarity			O2+	O2 Flush button
P Lamp, lighting, illumination					Cylinder
N Movement in one direction					Isolation transformer
ˆ Movement in two directions					Low pressure leak test
z Lock				r Mechanical ventilation
Z Unlock				UClose drain
134°C	Autoclavable			Q Expiratory flow
uOpen drain (remove liquid)					Alarm silence touch key
q Inspiratory flow					Menu touch key
t	O	2	sensor connection		Alarm silence touch key
					(Tec 6)
	Volume alarms On/Off touch key				End case touch key

	Systems with this mark agree with the			European Union Representative
	European Council Directive (93/42/EEC) for
XXXX	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.

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2 System Controls and Menus

In this section Anesthesia system controls . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-2 Breathing system components . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-5 Vaporizer controls . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-10 Ventilator controls . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-12 Optional auxiliary O2 flowmeter and suction regulators . . . . . . . . . . . . . . . 2-19

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Aespire 7900

Anesthesia system controls

wWARNING Explosion Hazard. Do not use S/5 Aespire systems with flammable anesthetic agents.

wWARNING Do not use antistatic breathing tubes or masks. They can cause burns if you use them near high frequency surgical equipment.

	3
	2	4
		5
	1	6

10

9

7, 8

1.Breathing system

2.Flow controls

3.Ventilator / monitoring display

4.Dovetail rails

5.Vaporizer

6.System switch

7.Pipeline pressure gauge(s) (upper row)

8.Cylinder pressure gauge(s) (lower row)

9.Brake

10.O2 flush button

Figure 2-1 • Aespire (front view)

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2 System Controls and Menus

Figure 2-1 shows these controls on the front of the S/5 Aespire.

Item		Description
2	Flow controls	Turn the control counterclockwise to increase the flow
		and clockwise to decrease. The system switch must
		be On for gas to flow.

7	System switch	Set the switch to the on (|) position to permit gas flow
		and to turn on the system.

9	Brake	Push down to lock. Lift to release.

10	O2 flush button	Push the O2 flush button to supply high flows of O2 to
		the breathing system.

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Aespire 7900

1

2

7

6

5

4

3

1.Circuit Breaker for Electrical Outlet

2.Electrical Outlet (optional)

3.Equipotential Stud

4.Mains Inlet

5.System Circuit Breaker

6.Cylinder(s) (optional)

7.Pipeline Connection(s)

Figure 2-2 • Aespire rear view

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2 System Controls and Menus

Breathing system components

19

17

16

15

14

13

12

11

10

9

18

8	7	6	5	4	3

1.Auxiliary common gas outlet (ACGO) switch

2.ACGO

3.Inspiratory check valve (unidirectional valve)

4.Inspiratory flow sensor / patient connection (circuit connections)

5.Canister (carbon dioxide absorbent)

6.Canister release

7.Expiratory flow sensor / patient connection (circuit connections)

8.Leak test plug

9.Expiratory check valve (unidirectional valve)

10.Breathing system release

11.Manual bag port

12.APL (adjustable pressure-limiting) valve

13.Bag/mechanical ventilation switch

14.Bellows assembly (mechanical ventilation)

15.Pressure gauge (airway)

16.Sample gas return port

17.Serial port

18.Manual Bag (optional; no bag arm)

19.Bag arm (optional)

Figure 2-3 • Breathing system parts

1

2

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Aespire 7900

Figure 2-3 shows these controls on the front of the S/5 Aespire.

Item		Description
1	Auxiliary Common	Sends fresh gas to the ACGO when the switch is
	Gas Outlet switch	activated. The ACGO may be used to provide fresh
	(ACGO)	gas to an external manual breathing circuit.
		Mechanical ventilation is not available when the
		auxiliary outlet is selected and a medium priority
		alarm will sound and a message “Aux Gas Outlet On”
		is displayed. Pressure and volume monitoring are
		not available when the ACGO is selected. Fresh gas
		oxygen monitoring is available when the ACGO is
		selected.
		The ACGO should not be used to drive external
		ventilators or for jet ventilation.
		Breathing system selected:

Auxiliary outlet selected:

4 & 7 Flow sensor	Flow sensors provide volume measurements for
	some monitoring functions. All systems have flow
	sensors in both positions of the flow sensor module.

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			2 System Controls and Menus
Item		Description
6	Canister release	Push to remove the canister. This allows the
		breathing system to vent to the room. Be sure to hold
		the canister by the handle before releasing the
		canister.
		Note: Always do a leak test after operating the
		canister release.

12	APL valve	Adjusts breathing system pressure limit during
		manual ventilation. The scale shows approximate

pressures. Above 30 cm H2O, you will feel clicks as the knob turns. Turn clockwise to increase. The following example setting is at about 20 cm H2O:

M NI

70

30

20

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Aespire 7900

Item		Description
13	Bag / Mechanical	Selects between manual ventilation (bag) or
	Ventilation switch	mechanical ventilation (ventilator).
		Mechanical ventilation Off (gas to bag):

Mechanical ventilation On (gas to bellows):

17	Bag arm (optional) Squeeze at (1) to raise or lower the arm. The Bag arm
	rotates at (2).

1

2

ACGO When you operate a breathing apparatus with fresh gas from the ACGO:

•Mechanical ventilation is not available.

•The pressure gauge, Bag/Vent switch, APL valve, and bag arm are not part of the external circuit.

•Volume and pressure monitoring are not available.

•O2 monitoring of fresh gas is available automatically when the ACGO is selected if the system has the O2 monitoring option.

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2 System Controls and Menus

•Fresh gas oxygen concentration is displayed on the ventilation screen. Set alarm limits appropriately. Note that fresh gas oxygen concentration

may not reflect FiO2 in rebreathing circuits such as the Mapleson series. Use an external O2 monitor if using a rebreathing circuit on ACGO.

•A sample of the fresh gas is diverted to the O2 cell in the breathing system.

•The sample flow to the O2 sensor is dependent on the pressure in the external circuit. The sample flow reduces the fresh gas flowrate to the external breathing circuit as shown in the graph.

•Do not use an external ventilator on the ACGO.

•Do not use the ACGO to drive external ventilators or for jet ventilation.

Estimate the mean pressure required for ventilation and determine a mean sample flow rate from the graph:

Scavenging the ACGO

sample flow

3

2

L/min

1

10

20

30

40

50

60

70

80

cm H2 0

Figure 2-4 • Back pressure (cm H20) vs. flow to O2 sensor (L/min)

If the external manual breathing circuit is to be used with N2O or volatile anesthetics, the sample flow should be scavenged.

1.Occlude the patient circuit of the breathing system by using the leak test plug located to the rear of the expiratory port.

2.Check for clinically correct settings. Set the Bag to Vent switch to the ventilator mode. Alternatively set the Bag to Vent switch to the bag mode and set the APL to MIN and attach a bag.

3.The bellows, or bag, will fill slowly with the fresh gas sample flow and then spill to the AGSS.

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Aespire 7900

Scavenging from the external manual breathing circuit

If the external manual breathing circuit is to be used with N2O or volatile anesthetics, the exhaust should be scavenged.

An auxiliary inlet is available for active AGSS units. It provides a 30 mm male connection into the auxiliary port under the breathing system.

•The auxiliary inlet is a convenience inlet to the air brake of active AGSS units. There is a reservoir to capture exhaust flows higher than the extract flow.

For all AGSS, a separate exhaust hose is necessary from the external manual circuit to the disposal point.

Vaporizer controls

Refer to the description in this section and the vaporizer operation and maintenance manual for more detailed information on the vaporizer.

Figure 2-5 shows the vaporizer controls.

1

2

3

4

1.Lock Lever

2.Concentration Control and Release

3.Tec 6 Plus

4.Tec 7

Figure 2-5 • Vaporizer controls

Item		Description
1	Lock lever	Turn the lever fully clockwise to lock the vaporizer in
		position.

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					2 System Controls and Menus
Item		Description
2	Concentration	Push the release and turn the concentration control
	control and release	to set the agent concentration. The Tec 6 Plus
		concentration control does not turn as long as the
		warm-up indicator is on.

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Aespire 7900

Ventilator controls

Optional Features

Control panel

The Aespire 7900 can be equipped with several optional ventilation functions. References made in this manual to SIMV and PSVPro modes, are only applicable to systems equipped with these functions.

Ventilator controls include:

•Touch keys

•Menu screens

•A control knob

1

2

3

13

12 11

10

9

8

7

1.Alarm silence (key) 2.Alarm message (display)

3.Volume alarms On/Off (key) 4.Menu key

5.Breathing circuit module (display) 6.Control knob

7.Control setting 8.Selection key 9.Ventilation mode (display)

10.Ventilator status (On or Off) 11.Mains indicator

12.End Case (key) 13.Measured values

AB.90.025

4

5

6

Figure 2-6 • SmartVent controls and monitored data

All but two of the controls for the ventilator are located on the Ventilation/

Monitoring display. The two controls are:

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2 System Controls and Menus

•The system switch, which powers the ventilator.

•The Bag/Vent switch, which starts and stops mechanical ventilation.

Item

Description

Menu key

Shows the main menu.

AB.90.036

Alarm silence key

Silences most alarms for 120 seconds.

and indicator

Pushing the key when no alarm is active pre-silences low

and medium priority alarms, except Minimum Monitoring,

for 90 seconds.

The "No O2 Pressure" alarm cannot be silenced.

AB.29.004

Remaining

silence time

Volume alarm key

Turns volume alarms on and off.

and status

Off

Vol Alarms

End Case key

End Case helps to prevent false alarms when no patient is

connected. It:

• Puts the apnea and volume alarms into Standby.

• Returns user selections to the most common

settings: Cardiac bypass off; Alarm limits shown.

• Sets the PEEP to 0 cmH2O (default value).

• Sets Plimit to one of two values: facility default or

40 cmH2O.

• Forces the circuit Leak Audio to On.

Mechanical ventilation must be off (set the Bag/Vent switch

to Bag or select the auxiliary common gas outlet).

AB.29.006

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Aespire 7900

How to set controls The bottom of the screen shows control settings.

Notes:

•The ventilator will not allow the setting of values it cannot supply. A reject tone will sound or a message will appear on the screen.

•If the incorrect key is pushed, wait ten seconds or push the correct key.

•If the new setting is not saved, the ventilator continues to use the old setting.

Step 1

Push the selection key below the setting.

AB.29.010

Step 2

Turn the knob to change the setting.

Step 3

Push the knob or the key to save the change.

AB.29.002

AB.29.011

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2 System Controls and Menus

How to use the menu Screens go back to the normal display 25 seconds after the last action.

During a calibration or other procedure, the screen shows the instructions.

Step 1

Push the Menu key to see the main menu.

Step 2

Turn the knob to select an option (highlight).

Step 3

Push the knob to show the next screen.

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AB29.013

AB.90.036

AB90.037

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Aespire 7900

Menu map Figure 2-6 shows the menu map. The table tells you about some of the options.

AB.90.036

SE

AB.90.041

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Note: If the Alarm Settings page shows VE Auto Limits On during mechanical ventilation, the system automatically calculates alarm limits.

Figure 2-7 • Menu map

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2 System Controls and Menus

More about menu functions

Menu	Option	Function
Main	Cardiac Bypass	Turns off volume and apnea alarms when these are not appropriate (e.g., during
	(In Progress/No)	heart lung bypass).
Alarm Settings	Circuit Leak	Turns off the alarm tone for circuit leaks. You must set the low ◊E alarm first.
	(Audio On/Off)	Select ‘Audio off’ if the circuit has a known leak (e.g., an uncuffed endotracheal
		tube).
Setup/	SIMV/PSVPro Setup	Shows additional ventilation settings for SIMV and PSVPro modes.
Calibration
	O2 Sensor Cal	Shows menu for O2 sensor calibration.
	Inspiratory Pause	Adds an inspiratory pause time to volume control breaths.
	Heliox mode	Tells the ventilator if heliox is in use.
	(On/Off)
	About Ventilator...	Shows service level settings: software version; if facility defaults or the control
		settings from the previous case are used when the system is first turned on;
		altitude; and drive gas (O2 or Air).
Screen and	Alarm Limits	’Show’ displays alarm limits next to the data on the screen.
Audio	(Show/Hide)

			Show Limits		Hide Limits
Units of Measure	’Show’ displays units under the data on the screen.
(Show/Hide)

Show Units	Hide Units

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