Datex-Ohmeda S-5 Light Technical reference manual (2005)

S/5

Datex-Ohmeda

TM

Light Monitor, F-LM1, F-LMP1

Technical Reference Manual

CAUTION: U.S. Federal law restricts this device to sale by or on the order of a licensed medical practitioner.

Datex-Ohmeda, Inc.

P.O. Box 7550

Madison, WI 53707-7550, USA
Tel. [phone]

Fax [phone]

All specifications are subject to change without notice.

Outside the USA, check local laws for any restriction that may apply.

Order Code M1037863

October 2005

Healthcare Finland Oy

Helsinki, Finland

P.O. Box 900

FIN-00031 GE, FINLAND

Tel: [phone]

Fax : [phone]

www.datex-ohmeda.com www.gehealthcare.com

© 2005 Copyright General Electric Company

Intended purpose

Datex-Ohmeda S/5 Light Monitor, F-LM1, F-LMP1 is intended for stationary and mobile monitoring of
patient’s ECG, SpO2, body temperature, invasive and non-invasive blood pressures as well as respiration
and CO2 in hospitals and ambulances. When used outdoors, the monitor must be in the protective case. The
monitor is intended for use by qualified medical personnel only. The S/5 Light Monitor is intended for
patients with weight from 5 kg (11 lb.) up. Respiration monitoring is intended for patients three years old and
up.

Classification according to IEC 60601-1

• CLASS I EQUIPMENT and INTERNALLY POWERED EQUIPMENT according to the type of protection against

electrical shock.

• TYPE BF or CF equipment according to the degree of protection against electric shock is indicated with a

symbol beside each patient connector.

• Degree of protection against harmful ingress of water as detailed in the IEC 60529: Monitor: IPX1,

vertically falling water drops shall have no harmful effects (applicable when the monitor is in upright
position, or tilted backwards). In the protective case IPX4, splash proof, when the case is closed
properly, the monitor is intact and operates on battery power. Power adapter: IPX0, ordinary equipment.

• EQUIPMENT not suitable for use in the presence of a FLAMMABLE ANESTHETIC MIXTURE with air or with

oxygen or nitrous oxide.

• CONTINUOUS OPERATION according to the mode of operation.

• CSPR 11: Group 1, Class A

Classification according to EU Medical Device Directive

• The monitor is classified as IIb.

Responsibility of the manufacturer

GE Healthcare Finland Oy (GE) is responsible for the safety, reliability and performance of the equipment only
if:

• assembly, operations, extensions, readjustments, modifications, service and repairs are carried out by

authorized personnel.

• the electrical installation of the relevant room complies with appropriate requirements.

• the equipment is used in accordance with the User’s Reference Manual and serviced and maintained in

accordance with the Technical Reference Manual.

The CO2 measuring option (N-LCM) is manufactured for GE Healthcare Finland Oy by
Welch Allyn OEM Technologies, 8500 SW Creekside Place, Beaverton, OR 97008 USA.

Trademarks

Trademarks Datex, Ohmeda, S/5, MemCard, ComWheel and Oxytip+ are property of GE Healthcare Finland
Oy. All other product and company names are property of their respective owners.

Master table of contents

Datex-Ohmeda S/5TM Light Monitor

Technical Reference Manual, M1037863

PART I, General Service Guide

Document
No.

M1051339

8001934-2

M1051339

8000060-1

8000060-1

8000060-1

8000060-1

890201-5

M1051340

890200-5

896192-1

8000060-1

M1051358

896551-2

896552-2

896553-2

896554-2

-

Updated Updated

Description

Introduction, Safety, Architecture, Functional check, Service check, General

troubleshooting, Service Menu, General specifications

Planned Maintenance Instructions

PART II, Product Service Guide

CPU

Power Supply Unit

Hemodynamic Unit

CO2 Unit

Isolation Power Supply Unit for CO2 Unit

Datex-Ohmeda Light Monitor Recorder, N-LREC

Datex-Ohmeda Light Monitor Power Adapter, N-LPOW

Datex-Ohmeda Light Monitor Battery Module, F-LBAT

Datex-Ohmeda Light External Battery Charger, N-LCHGR

DataCard and Network Options, N-LDATA, N-LNET, N-LDNET

Spare Parts, Upgrade Kits and Exploded Views

Optional N-LCM Upgrade for Light Monitor

Optional N-LDNET Upgrade for Light Monitor

Optional N-LDATA Upgrade for Light Monitor

Optional N-LNET Upgrade for Light Monitor

Method of Replacing the Lamp Unit (LCD Backlight)

1

2

1

2

3

4

5

6

7

8

9

10

11

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Table of contents

TABLE OF CONTENTS

PART 1 - GENERAL SERVICE GUIDE

TABLE OF CONTENTS i

Part 1 - General Service Guide i

TABLE OF FIGURES iii

1 INTRODUCTION 1

1.1 Notes to the reader............................................................................................................................... 2

1.2 About this manual................................................................................................................................ 2

1.3 Related documents .............................................................................................................................. 2

1.4 Installation .......................................................................................................................................... 3

1.4.1 Choosing the location .................................................................................................................. 3

1.4.2 Warnings.....................................................................................................................................3

1.5 Symbols .............................................................................................................................................. 4

1.5.1 Symbols on equipment ................................................................................................................ 4

1.5.2 Symbols on transport packaging................................................................................................... 6

2 SAFETY 8

2.1 Safety precautions ...............................................................................................................................8

2.1.1 Warnings.....................................................................................................................................8

2.1.2 Cautions....................................................................................................................................11

2.2 ESD precautionary procedures............................................................................................................ 12

2.3 Safety test ......................................................................................................................................... 13

3 ARCHITECTURE 14

3.1 Monitor structure................................................................................................................................ 14

3.2 Power supply unit...............................................................................................................................16

3.3 CPU...................................................................................................................................................16

3.4 NIBP unit ...........................................................................................................................................17

3.5 ECG unit ............................................................................................................................................ 17

3.6 STP unit .............................................................................................................................................17

3.7 CO2 unit............................................................................................................................................. 17

3.8 Display unit........................................................................................................................................ 18

3.8.1 Slave display.............................................................................................................................18

3.9 Power adapters..................................................................................................................................18

3.9.1 N-LPOW..................................................................................................................................... 18

3.10 Host serial communications ...........................................................................................................18

3.10.1 Module bus ........................................................................................................................... 18

3.10.2 Computer interface (RS-232) ................................................................................................. 18

3.10.3 CO2 module........................................................................................................................... 19

3.10.4 Power board .......................................................................................................................... 19

3.10.5 Recorder ...............................................................................................................................19

4 CLEANING 20

5 FUNCTIONAL CHECK 21

5.1 General functional inspection .............................................................................................................21

5.1.1 Recorder test.............................................................................................................................23

5.1.2 PCMCIA card test.......................................................................................................................23

5.1.3 Network test .............................................................................................................................. 24

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ECG board tests......................................................................................................................... 25

5.1.4

5.1.5 STP board tests ......................................................................................................................... 25

5.1.6 NIBP board test ......................................................................................................................... 26

5.1.7 Mainstream CO2 test.................................................................................................................. 26

5.2 Performance checks........................................................................................................................... 27

6 SERVICE CHECK 30

6.1 General service information................................................................................................................ 30

6.2 Service check procedure .................................................................................................................... 30

6.2.1 Visual inspection ....................................................................................................................... 31

6.2.2 Recorder test............................................................................................................................. 35

6.2.3 PCMCIA card test....................................................................................................................... 35

6.2.4 Network test.............................................................................................................................. 35

6.2.5 ECG measurement..................................................................................................................... 36

6.2.6 Respiration measurement.......................................................................................................... 37

6.2.7 Temperature measurement ........................................................................................................ 39

6.2.8 Invasive blood pressure measurement........................................................................................ 39

6.2.9 SpO2 measurement ................................................................................................................... 40

6.2.10 Non Invasive Blood Pressure measurement ............................................................................ 41

6.2.11 Mainstream CO2 measurement .............................................................................................. 43

6.2.12 For Light Monitor.................................................................................................................... 44

7 ADJUSTMENTS AND CALIBRATIONS 45

7.1 Pressure safety level detection “OFFSET”............................................................................................. 45

7.2 NIBP calibrations ............................................................................................................................... 45

7.2.1 Calibration check....................................................................................................................... 45

7.2.2 Calibration ................................................................................................................................ 46

7.3 Temperature calibration ..................................................................................................................... 47

7.4 Invasive pressure calibration .............................................................................................................. 48

8 GENERAL TROUBLESHOOTING 49

8.1 Troubleshooting flowchart .................................................................................................................. 49

9 SERVICE MENU 50

9.1 SW version / unit ID ........................................................................................................................... 50

9.2 Language selection ............................................................................................................................ 51

9.3 Monitor configuration......................................................................................................................... 51

10 GENERAL SPECIFICATIONS 52

10.1 Parameter specifications................................................................................................................ 52

10.1.1 ECG ...................................................................................................................................... 52

10.1.2 Impedance respiration...........................................................................................................52

10.1.3 Pulse oximetry (SpO2)/Pleth.................................................................................................. 53

10.1.4 Temperature.......................................................................................................................... 53

10.1.5 Non-invasive blood pressure.................................................................................................. 54

10.1.6 Invasive blood pressure (LMP1 models only)........................................................................... 54

10.1.7 CO2 (option N-LCM) ............................................................................................................... 55

10.2 General ......................................................................................................................................... 55

10.2.1 Environmental conditions ...................................................................................................... 56

10.3 Option codes ................................................................................................................................. 56

10.4 Display .......................................................................................................................................... 56

10.4.1 Slave display......................................................................................................................... 56

10.4.2 Trends................................................................................................................................... 57

10.4.3 Alarms .................................................................................................................................. 57

10.5 Light Monitor battery module (optional) (w/2 battery slots) .............................................................. 57

10.6 Light Monitor backup battery (optional)........................................................................................... 57

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Table of contents

External power adapter...................................................................................................................57

10.7

10.8 Light External Battery Charger (optional) .......................................................................................... 58

10.9 Output specifications .....................................................................................................................58

10.9.1 Nurse Call and Defibrillator Synchronization Signals ................................................................ 58

APPENDICES 59

FUNCTIONAL CHECK form A-1

SERVICE CHECK form B-1

EMC Guidance C-1

TABLE OF FIGURES

Figure 1 S/5 Light Monitor with battery module and power adapter ..................................................................... 1

Figure 2 Main block diagram of Light Monitor, revision 03 .................................................................................14

Figure 3 General troubleshooting chart............................................................................................................. 49

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Datex-Ohmeda S/5 Light Monitor

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i

Document No. M1051339

1 INTRODUCTION

The S/5 Light Monitor is a portable factory configurated compact monitor designed for stationary
and mobile indoor monitoring of a patient’s vital signs. The monitor is available in two
configurations; F-LM1 and F-LMP1. The difference between the configurations is illustrated in

table 1. Additionally, the monitor can be equipped with an optional recorder and battery module.

An external power adapter is provided for power supply. The Light Monitor has also data card
option and Ethernet interface which enables connecting the monitor to the network for remote
monitoring the patient and data collection.

Introduction

l
ll

Figure 1 S/5 Light Monitor with battery module and power adapter

Table 1 Basic parameter configurations

ECGR NIBP SpO2 TEMP InvBP

F-LM1

F-LMP1

1)

number of channels

• • •

• • •

Parameters

1)

1

1)

1

-

1)

2

Parameter explanations:

ECGR ECG and respiration
NIBP Non-invasive blood pressure

Pulse oximetry

SpO

2

TEMP Temperature
InvBP Invasive blood pressure

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Datex-Ohmeda S/5 Light Monitor

The following factory configurable parameters and functions are available:

• N-LNET; Network option

• N-LDATA; DataCard option

• N- LDNET; Network and DataCard options

• N-LCM; Mainstream CO

To all monitors following options are available:

• N-LREC; Thermal printer

• N-LPOW; External power supply, input: 110/230 VAC

• F-LBAT; Battery Module w/ two batteries

• N-LCHGR; External battery charger w/ two batteries

• N-LBB; Rechargeable built-in backup battery

1.1 Notes to the reader

GE Healthcare reserves the right to make changes in product specifications without prior notice.
The information in this manual is believed to be accurate and reliable; however, the manufacturer
assumes no responsibility for its use.

GE Healthcare assumes no responsibility for the use or reliability of its software on equipment that
is not furnished by GE Healthcare.

1.2 About this manual

This technical reference manual is intended for service personnel who will perform service and
maintenance procedures on the Light Monitor.

option

2

This technical reference manual is divided into two parts:

• Part I contains a general description of the monitor and service procedures.

• Part II contains detailed descriptions of the component parts of the monitor.

1.3 Related documents

S/5 Light Monitor User's Reference Manual

The User’s Reference Manual provides detailed instructions and references for the operation and
configuration of the monitor. Everyday service, maintenance procedures and troubleshooting hints
are also included.

Patient Monitor Supplies and Accessories

The Patient Monitor Supplies and Accessories Catalogue provides information on all supplies and
accessories available for the monitor.

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Introduction

1.4 Installation

1.4.1 Choosing the location

The monitor can be placed on a flat surface or hung with the handle from the bed or wall rails. Make
sure that the surface or rail holds up to at least 10 kg/22 lb.

1.4.2 Warnings

WARNING The monitor or its components should not be used adjacent to or stacked with

other equipment. If adjacent or stacked use is necessary, the monitor and its
components should be observed to verify normal operation in the configuration
in which it will be used.

When choosing the location, refer to the appendix C later in this document.

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Datex-Ohmeda S/5 Light Monitor

1.5 Symbols

1.5.1 Symbols on equipment

on the rear panel
indicates the
warning:

Attention, consult accompanying documents.

Electric shock hazard. Do not open monitor frame. Refer servicing to qualified personnel.
Do not touch any part of monitor or patient connections during defibrillation procedure.
Disconnect power supply before servicing. Use only external power adapter N-LPOW.

on the rear panel dust
filter indicates the
reminder:

on the patient
connector panel
indicates the
cautions:

on the external power
adapter indicates the
cautions:

on the battery unit
indicates the
warnings and
cautions:

on the CPU board
indicates the caution:

Check rear panel dust filter regularly, and clean at least once a month.

Use only the specified cables and accessories.

Ensure proper contact of the return electrode of the electrosurgery unit to your patient to
avoid possible burns at ECG electrode or other probe sites.

For continued protection against fire hazard, replace only with same type and rating of fuse.

Make sure voltage selector is set according to local voltage.

For indoor use only. For patient transport outdoors use the monitor in protective case and
battery powered.

Do not immerse in liquid or allow any liquid to enter the interior.

Do not put in fire.
Do not short-circuit any terminals.
Do not disassemble or mutilate.
Use only with Battery Module or External Battery Charger.
Discharge and charge batteries fully every 3 months or more often, if required, to restore full
capacity.

Sealed NiCd battery must be recycled or disposed of properly. Discharge before disposing.

There is a lithium battery on the CPU board. Discard useless battery according to local
regulations.

on the CO

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Document No. M1051339

sensor Do not immerse the sensor in liquids or autoclave it.

2

Introduction

d

SpO

: Type BF (IEC-60601-1) protection against electrical shock, not defibrillation proof.

2

: Type CF (IEC-60601-1) protection against electrical shock, not defibrillation proof.

T

1

NIBP: Type BF (IEC-60601-1) defibrillator-proof protection against electrical shock.

ECG, P

, P2: Type CF (IEC-60601-1) defibrillator-proof protection against electrical shock.

1

Battery packs contain heavy metal cadmium (chemical symbol Cd) and, in case of
disposal, must be separated from other waste according to local regulations.

Ni-Cd

Ni-C

This symbol indicates that the waste of electrical and electronic equipment must not be
disposed as unsorted municipal waste and must be collected separately. Please contact
an authorized representative of the manufacturer for information concerning the
decommissioning of your equipment.

Battery packs contain Ni-Cd and they can be recycled.

Protective earth terminal

Input voltage

Output voltage

Power ON/STANDBY

IPX-class:

IPX0

Alternating current

Direct current

Degree of protection against harmful ingress of water as detailed in the IEC 60529:

– ordinary equipment

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Datex-Ohmeda S/5 Light Monitor

IPX1
IPX4

– vertically falling water drops shall have no harmful effects.
– splash proof

SN, S/N Serial number

Battery charging LEDs: LEDs will blink while batteries are being charged, and will stay
illuminated when batteries are fully charged and the monitor is connected to mains.

The monitor is connected to the network (optional).

The DataCard (option) is inserted. If symbol is blinking the card is faulty, or it is not
inserted properly.

A blinking heart next to the heart rate or pulse rate value indicates the beats detected

A lung next to the respiration rate value indicates that respiration rate is calculated from
the impedance respiration measurement.

Silence alarm indicator. When displayed on the upper left corner of the screen, indicates
that all the alarms are silenced. When in the menu or digit fields, indicates that the
alarm source has been turned off.

Ethernet connectors

Printer connector

Sample gas outlet

Do not immerse the sensor in liquids.

ESD warning symbol for electrostatic sensitive devices. Pins of connectors identified
with the ESD warning symbol should not be touched. Connections should not be made
to these connectors unless ESD precautionary procedures are used. See section ”

ESD precautionary procedures“ in this Technical Reference Manual for details.

Symbol for non-ionizing electromagnetic radiation. Interference may occur in the vicinity
of equipment marked with this symbol.

1.5.2 Symbols on transport packaging

The contents of the transport package are fragile and have to be handled with care.

This symbol indicates the correct upright position of the transport package.

2.2

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The transport package must be kept in a dry environment.

Introduction

This symbol is to indicate the temperature limitations within which the transport package
should be kept and handled.

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Datex-Ohmeda S/5 Light Monitor

2 SAFETY

2.1 Safety precautions

2.1.1 Warnings

WARNING Indicates situations in which the user or the patient may be in danger of injury

or death.

Explosion hazard

• Do not use the monitor in presence of flammable anesthetics.

Electrical shock hazard

• Use only hospital grade grounded electrical outlets and power cord. Grounding reliability

can only be achieved when the equipment is connected to a receptacle marked ‘hospital
grade’.

• Do not remove cover. Refer servicing to qualified service personnel.

• Avoid any conductive contact to the probes and sensors.

• Disconnect the monitor from the electrical outlet before cleaning. Let it dry completely

before reconnecting it to the electrical outlet.

• Do not autoclave any part of the monitor with steam or ethylene oxide. Do not immerse in

liquid or allow liquid to enter the interior of any part.

• Make sure that external equipment is hospital grade grounded before connecting it to the

monitor. Do not connect any external equipment to the monitor, except that specified by GE
Healthcare.

• When connecting external equipment to the monitor, make sure that the whole combination

complies with safety standard IEC 60601-1-1 for the medical electrical systems and with
the requirements of local authorities. Non-medical electrical equipment connected to the
monitor shall be supplied from an extra isolating transformer which has a protectively
earthed outlet.

• Do not leave loose any sensor cables connected to patient. Either connect them to the

monitor or detach them from the patient.

• Do not use the monitor, any parts thereof or any accessories, if they have become wet or

exposed to liquid.

• Where the integrity of the external protective conductor installation or arrangement is in

doubt, equipment shall be operated from its internal power source.

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Patient safety

Safety

• Always make sure that necessary alarm limits are set and operative when you start

monitoring.

• When the alarms are suppressed, observe the patient frequently.

• Connect only one patient to one monitor at a time.

• Constant attention by a qualified professional is needed whenever a patient is under

anesthesia or connected to a ventilator. Some equipment malfunctions may pass
unnoticed in spite of the monitor alarm.

• Do not use antistatic or electrically conductive breathing tubes. They may increase the risk

of burns when electrosurgery unit is utilized.

• Do not use the monitor during magnetic resonance imaging (MRI).

• ECG, Impedance Respiration, InvBP: Ensure proper contact of the return electrode of the

electrosurgery unit to your patient to avoid possible burns at sensor sites.

• ECG, Impedance Respiration, InvBP: Make sure that no part of the patient connections

touches any electrically conductive material including earth.

• Impedance Respiration: In obstructive apnea, thoracic movements and impedance

variations may continue.

• NIBP: The monitor sets the inflation pressure automatically according to the first

measurement. Reset the case to reset the inflation limit before measuring a new patient.

• PATIENTS WITH PACEMAKERS OR ARRHYTHMIAS: Monitor may count the pacemaker pulses

as heart beats during cardiac arrest, some arrhythmias, and with certain types of
pacemakers particularly in ON R mode. Do not rely entirely upon rate meter alarms. Keep
patients with pacemakers and arrhythmias under close surveillance.

• PACEMAKER PATIENTS: The impedance respiration measurement may cause rate changes

in Minute Ventilation Rate Responsive Pacemakers. Set the pacemaker rate responsive
mode off or turn off the impedance respiration measurement on the monitor.

• SpO

: A damaged sensor, or a sensor soaked in liquid, may cause burns during

2

electrosurgery.

• SpO

: Change measuring site frequently. Change sensor site and check skin and circulatory

2

status every 2-4 hours with adults, and every hour with small children.

• The output signals are not floating and they must not be connected directly to a patient.

• Do not use delayed analog signals for defibrillator or intra-aortic balloon bump

synchronization.

• The monitor is intended for use by qualified medical personnel only.

• InvBP: All invasive procedures involve risks to the patient. Use aseptic technique. Follow

catheter manufacturer’s instructions.

• InvBP: Use only defibrillator proof cables and transducers.

• Operation of the monitor outside the specified values may cause inaccurate results.

• The monitor or its components should not be used adjacent to or stacked with other

equipment. If adjacent or stacked use is necessary, the monitor and its components should
be observed to verify normal operation in the configuration in which it will be used.

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Datex-Ohmeda S/5 Light Monitor

WARNING Use only approved accessories, mounts and defibrillator-proof cables and

invasive pressure transducers. For a list of approved supplies and accessories,
see the Supplies and Accessories catalog. Other cables, transducers and
accessories may cause a safety hazard, damage the equipment or system,
result in increased emissions or decreased immunity of the equipment or
system or interfere with the measurement. Protection against cardiac
defibrillator discharge is due in part to the accessories for pulse oximetry

), temperature (T) and invasive pressure (P) measurement.

(SpO

2

Single-use accessories are not designed to be re-used. Re-use may cause a risk
of contamination and affect the measurement accuracy.

Service

• Only trained personnel with proper tools and test equipment should perform the tests and

repairs described in this manual. Unauthorized service may void the monitor warranty.

• Switch the power off, unplug the power cord, and remove the batteries before service.

• The monitor is always energized with 12 V when the batteries are connected, even though

the power cord is removed and ON/STBY switch is in STBY position.

• Do not touch any exposed wire or conductive surface while covers are off and the monitor is

energized. The voltages present can cause injury or death.

• Electrostatic discharge through the PC boards may damage the components. Before

replacing PC boards, wear a static control wrist strap. Handle all PC boards by their non­conductive edges and use anti static containers when transporting them.

• Do not break or bypass the patient isolation barrier when testing LM-STP and LM-ECG

boards.

• Do not perform any testing or maintenance on the monitor while they are being used on a

patient.

• There are special components used in this monitor, which are vital to assure reliability and

safety. GE Healthcare assumes no responsibility for damage if replacement components
not approved by GE Healthcare are used.

• Replace the fuse with a fuse of the same type and the same rating.

• Perform electrical safety checks and current leakage tests to the monitor after service.

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2.1.2 Cautions

CAUTION Indicates situations in which the unit or devices connected to it may be

damaged.

• Use licensed patient cables and accessories only, see Datex-Ohmeda Catalogue Patient

Monitor Supplies and Accessories. Other cables and accessories may damage the system
or interfere with measurement.

• Before connecting power cord, ensure that the input voltage selector is set correctly in the

external power adapter.

• Use the monitor outdoors with the battery power only.

• Do not store the monitor beyond the specified temperature range.

• Do not use hypochlorite, ammonia-, phenol- or acetone-based cleaners. They may damage

the monitor.

• Clean rear panel fan dust filter once a month or whenever needed.

• Leave space around the monitor for ventilation to prevent the monitor from overheating.

• Do not apply pressurized air to any outlet, or tubing connected to the monitor. Pressure may

destroy sensitive elements.

Safety

Battery cautions

• When used in moving vehicle mount the monitor properly.

• Dispose of the device and parts thereof in accordance with local regulations.

• Vibrations during transport may disturb SpO

, ECG, impedance respiration and NIBP

2

measurements.

• CO

• CO

• DataCards: Do not subject cards to excessive heat, bending, or magnetic fields.

• InvBP: Mechanical shock to invasive blood pressure transducer may cause severe shifts in

, SpO2: Do not apply force to sensors or sensor cables.

2

: Do not force the water-trap into place.

2

zero balance and calibration, and produce erroneous readings.

• Electromagnetic interference from radio-frequency transmitting devices in ambulances may

affect the performance of this medical device.

• Do not put in fire.

• Do not short-circuit any terminals.

• Do not use damaged or leaking batteries.

• Do not disassemble or break the batteries.

• Use only with Battery Module.

• Charge and discharge batteries fully every 3 months or more often, if required, to restore full

capacity.

• Sealed NiCd battery must be recycled or disposed properly. Discharge before disposing.

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Storage and transport

• For allowed storage and transport conditions refer to the documentation delivered with the monitor.

Points to note

• Medical electrical equipment needs special precautions regarding electromagnetic compatibility and

needs to be installed and put into service by qualified personnel according to the electromagnetic
compatibility information provided in the Appendix C.

• Portable and mobile RF communications equipment can affect the medical electrical equipment.

• The allowed cables, transducers and accessories for the system are listed in the Supplies and

Accessories catalog delivered with the monitor.

• The equipment is suitable for use in the presence of electrosurgery. Please notice the possible

limitations in the parameter sections and in the "Safety precautions" section.

• Service and reparations are allowed for authorized service personnel only.

• CISPR 11 classifications:

− Group 1 contains all ISM (Industrial, scientific and medical) equipment in which there is

intentionally generated and/or used conductively coupled radio-frequency energy which is
necessary for the internal functioning of the equipment itself.

− Class A equipment is suitable for use in all establishments other than domestic and those directly

connected to the public low-voltage power supply network that supplies buildings used for domestic
purposes.

2.2 ESD precautionary procedures

• To avoid electrostatic charges to build up, it is recommended to store, maintain and use the

equipment at a relative humidity of 30% or greater. Floors should be covered by ESD
dissipative carpets or similar. Non-synthetic clothing should be used when working with the
component.

• To prevent applying a possible electrostatic discharge to the ESD sensitive parts of the

equipment, one should touch the metallic frame of the component or a large metal object
located close to the equipment. When working with the equipment and specifically when the
ESD sensitive parts of the equipment may be touched, a grounded wrist strap intended for use
with ESD sensitive equipment should be worn. Refer to the documentation provided with the
wrist straps for details of proper use.

ESD precautionary procedure training

It is recommended that all potential users receive an explanation of the ESD warning symbol and
training in ESD precautionary procedures.

The minimum contents of ESD precautionary procedure training should include an introduction to
the physics of electrostatic charge, the voltage levels that can occur in normal practice and the
damage that can be done to electronic components if they are touched by an operator who is
electrostatically charged. Further, an explanation should be given of methods to prevent build-up of
electrostatic charge and how and why to discharge one’s body to earth or to the frame of the
equipment or bond oneself by means of a wrist strap to the equipment or the earth prior to making
a connection.

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2.3 Safety test

Measure leakage current according to following procedures:

• Connect the GND electrode of the test device to the body of the 9-pin D-connector of the Light

Monitor. The nuts that are for locking the male cable connector can be used as well.

Safety

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3 ARCHITECTURE

The Light Monitor is a compact patient monitor with fixed configuration. The monitor is designed for
stationary and mobile indoor monitoring of a patient’s vital signs. The monitor can be equipped
with an optional recorder and battery module. An external power adapter is provided for power
supply.

3.1 Monitor structure

Keyboard

Patient

connector

panel

NIBP

ECG &

Respiration

InvBP(S),

TEMP(S) &

SpO2

MS-CO2

NESTPR

NIBP UNIT

Pwr data

ECG UNIT

STP UNIT

CO2 UNIT

Buttons &

ComWheel

POWER SUPPLY

Alarm leds

BOARD

Data buffers

Module bus

ECG

direct output

CO2 data

DSYNC,

NCALL

RS-232

Backlight

Inverter

CPU

BOARD

Display

Slave

Display

Speaker

Recorder

PCMCIA

ISA bus

Ethernet

Patient

isolated

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Battery data (12C)

Battery module

ECG Direct,

DSYNC, NCALL

Computer

Interface

Ext. power

supply: mains

or DC/DC

Battery #1

Battery #2

Figure 2 Main block diagram of Light Monitor, revision 03

The monitor can be divided into the following parts:

1. CPU board

The CPU board controls display and slave display, loudspeaker and recorder according the
data collected from the other units.

LM_blck_rev03_dgrm.vsd

2. STP unit

The STP unit is a parameter board that measures invasive blood pressure(s), body
temperature and oxygen saturation of the blood (SpO2).

3. ECG unit

The ECG unit is a parameter board that measures 3-lead ECG.

4. NIBP unit

The NIBP unit is a parameter board that measures non-invasive blood pressure.

Architecture

5. CO

unit

2

The CO

unit measures carbon dioxide consentration of the respiration gases. Measurement

2

is performed by an OEM product manufactured by Welch Allyn.

6. Network unit

The unit enables connecting the Light Monitor to the network for remote monitoring the
patient and data collection.

7. Memory unit

The memory unit is an optional data storage module. It is used for storing patient related
physiological data by removable PC-card.

8. Power supply board

Board delivers power from one of the power sources, external power supply or one of the
two batteries. The other operations are:

• battery management: secondary battery charge/discharge control and capacity

gauge

• keyboard and ComWheel reading

• alarm and charge led control/drive

• buffering serial communication

9. Display

The display is 8.4” Active Matrix Color TFT LCD. The resolution is 640 x 480 pixels.

10. Printer

The built-in thermal printer provides a real time waveform printing, numerical data and trend
data printout up to 24 hours.

11. Battery module

Two rechargeable and removable secondary batteries are located in the separate battery
module.

12. Keyboard and Comwheel

Keyboard and ComWheel actions are read by the power supply board.

13. Backup Battery

Built-in NiCd battery is located inside the monitor. It provides typically up to 30 min
operation time to the monitor.

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Datex-Ohmeda S/5 Light Monitor

3.2 Power supply unit

The power supply board functions can be summarized as follows:

• Charge the batteries.

• Choose between battery and mains operation.

3.3 CPU

• Distribute power to the CPU, CO

• Control the alarm LEDs.

• Read the input from the keyboard and ComWheel.

The CPU, CO

, STP, ECG, and NIBP boards are connected to the power supply board for centrally

2

, STP, ECG, and NIBP boards.

2

distributed power. Thus all signals transmitted between these boards are transmitted via the power
supply board. The power supply board controls the reset of the CPU board via the startup key.

The CPU board functions can be summarized as follows:

• Process the data transmitted from the CO

• Control the CO

• Control the display, loudspeaker and recorder.

• Generate alarm signals.

• Generate nurse call signal.

, STP, ECG, and NIBP boards.

2

, STP, ECG, NIBP and power supply boards.

2

The display, the loudspeaker and the recorder, are all connected directly to the CPU board. The
CPU board includes the circuitry required to control these units. The CPU board communicates with
the power supply board over a 9600 baud serial communication channel. The ECG, STP and NIBP
boards are connected to the CPU board via the power supply board. The CPU board communicates
with these boards over a 500 kbaud serial communications channel. The reset of the ECG, STP and
NIBP boards is controlled separately.

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The CPU board generates a nurse call signal in the event of an alarm situation. The signal is
transmitted via the power supply board to the serial I/O connector on the monitor rear panel.

3.4 NIBP unit

The NIBP unit consists of the NIBP board, an air pump, and pneumatic valves. The NIBP board
functions can be summarized as follows:

• Control the function of the air pump and the pneumatic valves.

• Measure the pressure variation of the NIBP cuff.

The pressure variation of the NIBP cuff is analyzed on the NIBP board and transmitted to the CPU
board over a serial communication channel.

3.5 ECG unit

The ESTP board functions can be summarized as follows:

• Measure ECG

• Generate defibrillation synchronization signal

The ECG signal is monitored and analyzed on the ECG board and transmitted to the CPU board over
a serial communication channel.

The ECG board is electrically patient isolated. The operating voltage 10...16 V is generated from the
+ 12 V received from the power supply board. The ECG board is reset by the CPU board.

Architecture

The ECG board generates a defibrillation synchronization signal. The signal is transmitted via the
CPU and power supply board to the serial I/O connector on the monitor rear panel. The
defibrillation synchronization signal is available also on the patient connector on the patient
connector panel.

3.6 STP unit

The STP board functions can be summarized as follows:

• Measure SpO

The signals from the parameters being monitored are analyzed on the STP board and transmitted to
the CPU board over a serial communication channel.

The STP board is patient isolated. The operating voltage is generated from the +12 V voltage
received from the power supply board. The STP board is reset by the CPU board.

3.7 CO2 unit

The CO2 unit consists of the CO2 board, an isolated power supply, and a pump. The CO2 board
functions can be summarized as follows:

• Process the CO

• Generate end tidal and inspiratory CO

• Control the Mainstream CO

The waveform data is processed on the CO
communication channel.

, temperature and invasive blood pressure.

2

waveform generated by the mainstream CO2 sensor.

2

values, and breaths per minute data.

2

sensor motor and heater.

2

board and transmitted to the CPU board over a serial

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Datex-Ohmeda S/5 Light Monitor

3.8 Display unit

The main CPU directly controls the monitor display, an 8.4 inch color LCD. Supply voltages for the
display are connected via the CPU board. The inverter board provides high voltage for the display
backlights. The CPU controls the display brightness by adjusting the backlight voltage.

NOTE: The LCD display backlight circuit runs on a high voltage. Do not touch the inverter
board or the backlight tube leads when powered.

3.8.1 Slave display

Internal VGA compatible display controller with 640 × 480 resolution. The slave display can be
connected to external VGA connector, X7.

3.9 Power adapters

3.9.1 N-LPOW

The external power adapter N-LPOW is connected to the power connector on the monitor rear panel. The adapter includes a switch for the voltage range and a LED indicating energization. The power adapter supplies 12.5 V to operate the monitor and 18.5 V to charge the batteries. Fuses are located on the primary side of the adapter for overvoltage protection. See the part II/7 for more information.

3.10 Host serial communications

3.10.1 Module bus

The module bus is an asynchronous, CMOS-level serial communication between host processor
and Datex-Ohmeda based parameter modules and CO
and RXDM signals are used. The TXDM signal is module bus transmit line from host to modules and
the RXDM signal is a receive line from modules to host. Modules are wired-OR connected to RXDM
line.

The module communication link is also provided in the D15 male connector on the rear panel.

3.10.2 Computer interface (RS-232)

The computer interface is an asynchronous, RS-232-level serial communication between the Light
Monitor and external device e.g. PC. External device is connected to the D15 male connector on
rear panel.

measurement by Welch Allyn. Only TXDM

2

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3.10.3 CO2 module

The CO2 module, manufactured by Welch Allyn is used in the Light Monitor for CO2 mainstream
measurement. Communication with the host is provided by an asynchronous serial link. Signals
used in the communication are TXDC, RXDC. The TXDC signal is transmit line from host to CO
module and the RXDC signal is a receive line from CO

3.10.4 Power board

Host communicates with the power board on an asynchronous serial link. TXDP and RXDP signals
are used. The TXDP signal is transmit line from host to power board and the RXDP signal is a receive
line from power board to host.

3.10.5 Recorder

The host sends data to the printer via an asynchronous serial link. TXDR, RXDR, CTSR and RTSR
signals are used. The TXDR signal is transmit line from host to recorder and the RXDR signal is a
receive line from recorder to host CTSR and RTSR lines are used for handshaking.

module to host.

2

Architecture

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Datex-Ohmeda S/5 Light Monitor

4 CLEANING

Before cleaning:

• Turn the power to Standby

• Disconnect the power cord from the mains power supply

After cleaning:

• Let dry completely

• Reconnect the power cord and turn the power ON

CLEANING CASING /
SURFACE
when needed

Wipe gently with a cloth, moistured
with a mild detergent.

Let dry completely before
reconnecting the power cord.

CLEANING DUST
FILTER
at least once a month

Pull out the filter frame on the rear
panel. Do not remove any screws!

Shake the filter and blow out the
dust.

If the filter is damaged, replace it
with a new one (p/n 888260).

PERMITTED CLEANERS PERMITTED DISINFECTANTS

Datex-Ohmeda cleaning fluid

Other mild detergents

For more detailed information see User’s Reference Manual.

Ethanol

Isopropyl alcohol

Chlorite compounds

Glutaraldehyde

CLEANING PATIENT
ACCESSORIES

See the instructions delivered with
the accessory.

NOT ALLOWED

Do not use Hypochlorite, acetone-,
phenol- or ammonia based cleaners.

Do not autoclave the device.

Do not immerse the device in liquids
or allow liquids to enter the interior of
any part.

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5 FUNCTIONAL CHECK

These instructions include complete procedures for functional check (FC) for Datex-Ohmeda Light
Monitors. The functional check is recommended to be performed after monitor installation and
after long storage.

The first part of the instructions contains check procedures that are done through the service menu.
These checks are especially recommended if the monitor has been stored for a long time without
using it.

When installing a new monitor, the performance checks with a simulator and accessories are
typically enough to ensure the correct function of the monitor. We recommend however always
performing the complete check to confirm that no hardware failures occurred during transportation.

The instructions are planned for the maximum functional configuration. Perform the procedures in
the ascending order and skip the items that do not correspond to your monitor configuration.

The instructions include a check form (Appendix A) to be filled in when performing the
corresponding procedures.

Functional check

The symbol

checklist.

All menu selections related to

Monitor Setup - Install/Service (password 16-4-34) -
Service (password 26-23-8) – Modules - ESTP - ECG

Menu selections related to other products e.g. simulators are written in following typeface:

" in the instructions means that the performed procedure should be signed in the

Datex-Ohmeda products are written in following typeface:

RESP - WAVE - NORM

- RATE - 20

Recommended tools:

Tool Order No.

Simulator capable of simulating ECG, RESP and invBP -

SpO2 finger probe SAS-F4

Adult NIBP cuff 572435

Adult NIBP hose 877235

MemCard- Data (only for monitors with data card option)

Temperature test plug set 884515

Mainstream CO2 sensor (only for monitors with CO2 option) 902300

Mainstream CO2 airway adapter (only for monitors with CO2 option) 902301/902302/902303

5.1 General functional inspection

1. Connect the power cord to the power adapter and the power adapter cable to the Light
Monitor.
Check that the green LED turns on in the power adapter and the LED in the lower right-hand
corner of the monitor turns on or starts flashing.
If the monitor contains a battery module, check that both battery charge status LEDs turn on
or start flashing.

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Datex-Ohmeda S/5 Light Monitor

2. Switch the monitor on. Check that the monitor starts up properly, i.e.

− both alarm LED’s turn on and off

− the fan starts running

− the start-up sound is heard from the loudspeaker

− the normal monitoring screen appears

− no error messages appear on the screen *)

− If the monitor contains a recorder, two lines of start-up information should be

− check that the time and date are correct, adjust if necessary

− if the monitor contains an F-LBAT or N-LBB, check that the battery symbol is

3. Check the loudspeaker by adjusting the alarm volume in the Alarms Setup menu:

Press the

Select Alarms Setup - Alarm Volume

Test the whole volume scale from 1 to 10 by turning the ComWheel and check that the
alarm volume changes correspondingly. The alarm sound should be clear and audible at all
settings.

Select Main Menu

recorded

displayed

*) NOTE: “Check network connectors” will appear if the N-LNET or N-LDNET option is
installed.

Menu button.

4. Select Service View – Keyboard - Dummy Press.

Press the function keys one by one. Check that each key generates a sound from the
loudspeaker and the corresponding text.

5. Check that the time and date are correct, adjust if necessary.

Select Monitor Setup – Set Time and Date

NOTE: You cannot change the monitor’s time settings after a case has started. This prevents
losing the trend data.
NOTE: If the clock shows time 0:00 continuously after start-ups, the SRAM/Timekeeper’s
battery on the CPU board needs to be replaced.
Return to Main Menu by selecting Previous Menu - Main Menu

6. Check the battery (If F-LBAT or N-LBB option included):

Disconnect the power cord (without switching the monitor to standby).

Check that the monitor continues to run normally with battery. The battery indicator should
appear in the upper right hand corner of the screen:

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