SLE 4000, 5000 Service Manual

Software/Manual application Information:

Note: This manual is to be used only with model A ventilators using the following software version:

Version 3, 3.1, 3.2, 3.3, 4 & 4.1

Contact Information:

SLE Limited
Twin Bridges Business Park
232 Selsdon Road
South Croydon
Surrey	CR2 6PL
Telephone:	[phone]
Fax:	[phone]
E-mail:	[e-mail]	(E-mail’s should be addressed to the Service Manager)
Web site:	www.sle.co.uk

All rights reserved. No part of this publication may be reproduced, stored in any retrieval system, or transmitted in any form or by any means, electronic, mechanical, photocopy, recording or otherwise, without prior permission of SLE. © Copyright SLE 12/04/2007.

Manual : SM0015 Issue 10

SLE Part Nº: N6645

Page 2

(Model A)

Contents
1. Warnings and Cautions .............................................................................................	10
1.1. Warnings ........................................................................................................	10
1.2. Cautions .........................................................................................................	11
2. Principles of Operation ..............................................................................................	14
2.1. Electronic System...........................................................................................	14
2.2. Pneumatic System .........................................................................................	15
3. Description of Symbols .............................................................................................	18
4. Equipment list ...........................................................................................................	22
5. ENGMODE ...............................................................................................................	24
5.1. Accessing the Calibration Programs ..............................................................	24
5.2. Ventilator Calibration Program .......................................................................	26
5.3. O2 & Flow System Calibration........................................................................	28
5.4. Reset Elapsed Time .......................................................................................	29
5.5. Exit .................................................................................................................	29
5.6. Touch Screen Calibration Program ................................................................	29
6. Component Replacement Procedure ........................................................................	32
7. Preparing the SLE5000 .............................................................................................	33
8. Component Replacement (Electronic unit) ...............................................................	35
8.1. N6634 CAN Card ...........................................................................................	35
8.2. BIOS battery...................................................................................................	35
8.3. Disk-on-Chip...................................................................................................	36
8.4. N6631/01 PC Board .......................................................................................	37
8.5. N6631/06 Serial controller (Touch screen).....................................................	38
8.6. A0763/02 Control and Monitor Board.............................................................	39
8.7. M0900 Power Supply Unit..............................................................................	41
8.8. M0901 Batteries .............................................................................................	42
8.9. A0761 Transducer PCB Assembly.................................................................	43
8.10. Inverter PCB.................................................................................................	44
8.11. N6631/02 LCD & N6631/05 Touch Screen ..................................................	47
9. Component Replacement (Pneumatic unit) ..............................................................	56
9.1. N2185/05 & 06 Duckbill and conical filters. ....................................................	56
9.2. L0287 Blender Assembly ...............................................................................	57
9.3. N2195/06 Fresh Gas Supply solenoid (SV7)..................................................	58
9.4. N6612 Purge Regulator (PR7) Pre PAM (Proximal Airway Modification).......	59
9.5. N6612 Purge Regulator (PR7) Post PAM (Proximal Airway Modification).....	59
9.6. N6614 Speed controller (FR1)........................................................................	60
9.7. N6613 Purge Regulator (PR5) Pre Proximal Airway Modification..................	61
9.8. N6613 or /03 Purge Regulator (PR5) Post Proximal Airway Modification......	63
9.9. N6615/01 Input Air Regulator (PR1)...............................................................	65
9.10. N6615/02 Input Oxygen Regulator (PR2).....................................................	67
9.11. N6624 High Speed Jet Valves (SV9/10/11/12) ............................................	68
(Model A)	Page 3

9.12. N6623, N6623/33 or N6623/S38 Pressure regulators (PR6)........................	69
9.13. N6623, N6623/33 or N6623/S38 Pressure regulators (PR3 &PR4) .............	71
10. A0763/02 Monitor and control board .......................................................................	74
10.1. U23 and U33 socket configurations for A0760 Rev D base PCB. ................	74
10.2. A0763/02 board progammable devices ........................................................	75
10.3. A0763/02 Board Hardware Identifier.............................................................	76
11. Electrical Safety Testing of the SLE5000 ................................................................	79
12. PSU Testing. ...........................................................................................................83
13. Maintenance and Overhaul .....................................................................................	86
13.1. Preventative Maintenance ............................................................................	86
13.2. 6, 18, 30 & 42 month preventative maintenance procedure .........................	88
13.3. 12 and 36 month preventative maintenance procedure................................	94
13.4. 24 month and 48 month overhaul procedures ..............................................	98
13.5. 24 month / 10,000 hour overhaul procedure.................................................	100
13.6. 48 month / 20,000 hour overhaul procedure.................................................	108
13.7. 48 month overhaul procedure using N9010/48 overhaul kit. ........................	110
14. Calibration Procedure for V3, V3.1 & 3.2 software ..................................................	128
14.1. Preliminary Inspection before calibration ......................................................	128
14.2. Pneumatic set up ..........................................................................................	129
14.3. Calibration of Controller and Monitor subsystems ........................................	130
14.4. Controller “Block and Leak” pressure sensor calibration ..............................	132
14.5. Controller Blender Pressure Sensor zeroing and Input pressure reg. trim ...	133
14.6. Mean Jet Pressure Regulator Calibration .....................................................	134
14.7. Forward Jet Pressure Regulator Calibration.................................................	135
14.8. Wave shaping for leading and trailing edge of insp. phase ..........................	137
14.9. Reverse Jet Pressure Regulator Calibration.................................................	138
14.10. O2 System Calibration ................................................................................	139
14.11. Flow System Calibration .............................................................................	139
14.12. Pressure Triggering Verification..................................................................	139
14.13. Gas Fail Detection Verification....................................................................	139
14.14. Blender and Oxygen Monitoring Verification...............................................	140
14.15. Soak Test....................................................................................................	141
14.16. Battery Charge Verification .........................................................................	142
14.17. Battery Life Verification ...............................................................................	142
14.18. Total Power Fail Alarm Test........................................................................	142
14.19. Pressure Calibration Verification.................................................................	143
15. Calibration Procedure for V3.3 software .................................................................	146
15.1. Preliminary Inspection before calibration ......................................................	146
15.2. Pneumatic set up ..........................................................................................	147
15.3. Calibration of Controller and Monitor subsystems ........................................	148
15.4. Controller “Block and Leak” pressure sensor calibration ..............................	150
15.5. Controller Blender Pressure Sensor zeroing and Input pressure reg. trim ...	151
15.6. Mean Jet Pressure Regulator Calibration .....................................................	152
15.7. Forward Jet Pressure Regulator Calibration.................................................	153

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15.8. Reverse Jet Pressure Regulator Calibration ................................................	155
15.9. Time Constant for pressure measurement waveform ..................................	156
15.10. Wave shaping for leading and trailing edge of insp. phase........................	156
15.11. O2 System Calibration................................................................................	157
15.12. Flow System Calibration.............................................................................	157
15.13. Pressure Triggering Verification .................................................................	157
15.14. Gas Fail Detection Verification ...................................................................	158
15.15. Blender and Oxygen Monitoring Verification ..............................................	159
15.16. Soak Test ...................................................................................................	160
15.17. Battery Charge Verification.........................................................................	161
15.18. Battery Life Verification ..............................................................................	161
15.19. Total Power Fail Alarm Test .......................................................................	161
15.20. Pressure Calibration Verification ................................................................	162
16. Calibration Procedure for V4 & 4.1 software ...........................................................	164
16.1. Preliminary Inspection before calibration......................................................	164
16.2. Pneumatic set up..........................................................................................	165
16.3. Calibration of Controller and Monitor subsystems........................................	166
16.4. Controller “Block and Leak” pressure sensor calibration..............................	168
16.5. Controller Blender Pressure Sensor zeroing and Input pressure reg. trim...	169
16.6. Mean Jet Pressure Regulator Calibration.....................................................	170
16.7. Forward Jet Pressure Regulator Calibration ................................................	171
16.8. Reverse Jet Pressure Regulator Calibration ................................................	173
16.9. Time Constant for pressure measurement waveform ..................................	174
16.10. Wave shaping for leading and trailing edge of insp. phase........................	174
16.11. O2 System Calibration................................................................................	175
16.12. Flow System Calibration.............................................................................	175
16.13. Pressure Triggering Verification .................................................................	175
16.14. Gas Fail Detection Verification ...................................................................	176
16.15. Blender and Oxygen Monitoring Verification ..............................................	177
16.16. Soak Test ...................................................................................................	178
16.17. Battery Charge Verification.........................................................................	179
16.18. Battery Life Verification ..............................................................................	179
16.19. Total Power Fail Alarm Test .......................................................................	179
16.20. Pressure Calibration Verification ................................................................	180
17. Functional Testing ...................................................................................................	182
17.1. Ventilator setup ............................................................................................	182
18. Trouble Shooting Chart ...........................................................................................	216
19. Software Version History ........................................................................................	226
19.1. SLE4000 Software .......................................................................................	226
19.2. SLE5000 Software .......................................................................................	227
20. Oxygen Calibration Routines ..................................................................................	230
20.1. One point or 100% Oxygen system calibration ............................................	230
20.2. Two point or 21% & 100% Oxygen system calibration.................................	230

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21. Alarms .....................................................................................................................	232
21.1. Alarm Protocols.............................................................................................	232
21.2. Alarm Sounds ...............................................................................................	232
21.3. Alarm Descriptions and actions to be taken..................................................	233
21.4. Software and System Fail Protocols .............................................................	252
22. Cleaning, disinfection and sterilization ....................................................................	253
22.1. Preparation of a new ventilator .....................................................................	253
22.2. Cleaning and disinfection of an in-service ventilator.....................................	253
22.3. Cleaning method...........................................................................................	254
22.4. Disinfection method ......................................................................................	255
22.5. Sterilization method ......................................................................................	256
23. Technical Specification ............................................................................................	257
23.1. Operating Modes Conventional Ventilation...................................................	257
23.2. HFO Ventilation.............................................................................................	258
23.3. Measurement ................................................................................................	263
23.4. Alarms...........................................................................................................	265
23.5. Patient circuits...............................................................................................	266
23.6. Outputs .........................................................................................................	267
23.7. Gas supplies .................................................................................................	268
23.8. Power, Dimensions, Standards etc...............................................................	269
23.9. Environmental Storage Conditions ...............................................................	269
24. Pneumatic Unit Schematic ......................................................................................	270
25. Ventilator labelling ...................................................................................................	271
25.1. SLE4000 .......................................................................................................	271
25.2. SLE5000 .......................................................................................................	272
26. Illustrated Parts List .................................................................................................	274
Ventilator assembly ...............................................................................................	276
Base plate and side door assembly ......................................................................	284
Front facia assembly .............................................................................................	286
Electronic module .................................................................................................	288
Pneumatic module (Pre proximal airway modification) ..........................................	321
Pneumatic module ................................................................................................	327
HFO module (Pre proximal airway modification) ...................................................	334
HFO module ..........................................................................................................	344
Oxygen regulator module ......................................................................................	357
Partition assembly .................................................................................................	360
Pneumatic module, sub assembly ........................................................................	364
27. Equipotential stud modification ................................................................................	374
27.1. Equipotential stud connection .......................................................................	375
28. Electrical Block Diagram .........................................................................................	378

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29. Pneumatic Unit Schematic ......................................................................................	379
29.1. Schematic Pre PAM (Proximal Airway Modification)....................................	379
29.2. Schematic Post PAM....................................................................................	380
30. Pneumatic Unit Tubing connections .......................................................................	381
30.1. Tubing Connections Pre PAM ......................................................................	381
30.2. Tubing Connections Post PAM.....................................................................	382
31. Main Loom Circuit Diagram ....................................................................................	383
32. A0761 circuit diagram .............................................................................................	386
32.1. Transducer PCB Assembly ..........................................................................	386
33. A0763/02 circuit diagrams ......................................................................................	388
33.1. Micro Controller ............................................................................................	388
33.2. Conventional Valve Drive .............................................................................	389
33.3. Power Distribution And Hardware Identifier..................................................	390
33.4. Analogue Valve Drive / Non Volatile Memory / Interboard Comms..............	391
33.5. High Speed Valve Drive ...............................................................................	392
33.6. Analogue Data aquisition/Monitor port .........................................................	393
33.7. Control & Monitor, PCB PSU Circuit.............................................................	394
33.8. Control & Monitor, Micro Non-isolated..........................................................	395
33.9. Control & Monitor, Micro Isolated .................................................................	396
33.10. Control & Monitor, Analog Isolated.............................................................	397
33.11. Control & Monitor, Alarm Controller............................................................	398
Appendix 1. Calibration Checklist .................................................................................	401
Appendix 2. Check list ..................................................................................................	409
Appendix 3. RS232 .......................................................................................................	414
33.12. Warnings for RS232 ...................................................................................	414
33.13. Location of RS232 Port ..............................................................................	414
33.14. Overview ....................................................................................................	415
33.15. Data and Pinout description. ......................................................................	415
33.16. Cable ..........................................................................................................	415
33.17. Parameter Descriptions and format............................................................	416
33.18. List of parameters.......................................................................................	416
33.19. Table of current alarm condition codes. .....................................................	419
33.20. RS232 Connection Settings and Testing Data Output ...............................	421
33.21. Glossary .....................................................................................................	421
Appendix 4. VueLink Technical Data ............................................................................	424
33.22. Glossary .....................................................................................................	424
33.23. Connecting the SLE5000 to the VueLink patient monitor...........................	424
33.24. Parameter Descriptions..............................................................................	425
33.25. Data transferred to the VueLink system from the SLE5000 .......................	426
33.26. Alarm and inoperative indications...............................................................	428

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34.	VueLink Task Window Layout .................................................................................	431
	34.1. Notes on General System Behaviour............................................................	432
35.	Activation of VueLink ...............................................................................................	433
	35.1. Disabling VueLink. ........................................................................................	434

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Warnings and Cautions

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Page 9

1. Warnings and Cautions

1.1 Warnings

1.The electronic and pneumatic units of the SLE5000 infant ventilator are sealed at the factory with two Warranty Void If Label Broken seals. If the ventilator is subject to a warranty agreement do not attempt to carry out any procedure that would involve breaking these seals. If you make a warranty claim and these seals are broken SLE may deem the warranty claim null and void. If the ventilator develops a fault within the warranty period please refer to your warranty documentation.

2.Oxygen - Fire Hazard. Oxygen vigorously supports combustion and its use requires special precaution to avoid fire hazards. Keep all sources of ignition away when oxygen is in use. Do not use oil or grease on oxygen fittings or where oxygen is used.

3.Check the condition of the gas supply hoses to the ventilator. Do not use any hose that shows signs of cracking, abrasion, kinking, splits, excessive wear or ageing. Make sure that the Air or O2 hose has not come into contact with oil or grease.

4.The SLE5000 ventilator contains temperature dependant devices which perform normally in controlled environments in hospitals. However if the ventilator has been stored at a temperature different to that in which it will be used, allow the unit to acclimatize before powering up.

5.Failure to comply with the recommended service programs could lead to injury of the patient, operator or damage to the ventilator. It is the owners responsibility to ensure that the equipment is regularly maintained.

6.The SLE5000 contains static sensitive electrical devices. Anti static precuations must be observed at all time when working on the ventilator.

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(Model A)

1.2 Cautions

1.When working on the pnuematic unit, protect the front facia panel by resting it on a soft pad.

2.Do not use a sharp instrument, such as a pen to activate the controls as the excessive pressure applied by the point will damage the touch screen membrane.

3.The Ventilator must be connected to a suitably rated and grounded electrical power source.

4.If the SLE5000 is adversely affected by equipment emitting electromagnetic interference then that equipment should be switched off or removed from the vicinity of the SLE5000. Conversely, if the SLE5000 is the source of interference to other neighbouring equipment, it should be switched off or taken to another location.

5.The functioning of this machine may be adversely affected by the operation of equipment such as high frequency surgical (diathermy) equipment, defibrillators, mobile phones or short-wave therapy equipment in the vicinity.

7.The equipment is not suitable for use with, or in the presence of flammable anaesthetic mixtures.

6.The SLE5000 flow monitoring system is calibrated to work in an air / oxygen mixture, the use of other gas mixtures may affect the flow monitoring accuracy of the ventilator.

7.Disposal of the Oxygen Sensor should be in accordance with local regulations for hazardous substances. Do not incinerate. SLE offer a cell disposal service.

8.The SLE5000 contains four batteries, three 2 cell sealed lead acid batteries and one

PCB mounted lithium battery. At the end of their useful life these batteries should be disposed of in accordance with local authority guidelines.

9.Apart from the above, the SLE5000 and accessories do not contain any hazardous components therefore no special precautions are required for their disposal.

10.Care should be taken when attaching other equipment as this may affect mechanical stability.

11.Any computer connected to the ventilator must be specified for medical use (ie. it must comply with the requirements of BS-EN-60601:1990).

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12.There is no special protection provided against ingress of water or liquids.

13.Do not use solvent based cleaning solutions to clean the touch screen or covers.

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(Model A)

Principles of Operation

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2. Principles of Operation

The SLE5000 infant ventilator consists of an electronic system in the upper section of the ventilator and a pneumatic system in the lower.

2.1 Electronic System

The electronic system comprises three autonomous subsystems, one responsible for monitoring the patient, one responsible for controlling the valves of the pneumatic system and one for the user interface (touchscreen and displayed data). They are connected together by three serial communication links in a delta configuration.

The ventilator has an internal battery that can power the ventilator in the event of a mains power fail. If the mains power fails with the battery fully charged, then operation will continue for 30 to 60 minutes depending on ventilation mode.

See “Electrical Block Diagram” on page 378.

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2.2 Pneumatic System

The pneumatic system comprises of the tubing and electro-mechanical valves necessary to provide the gas in conventional and oscillatory ventilation modes. The two gas controlling functions are blending and pressure generation

2.2.1 Blending

The method used for blending air and oxygen in known proportions is to pressure regulate the two supplies (air and oxygen) so they produce equal flow rates and then allow each supply into a mixing chamber for a time period equivalent to the proportions required. For example, delivering oxygen at a set flow rate into a mixing chamber for 1 second and air at the same flow rate for 2 seconds will result in a mixture of 1 part oxygen to 2 parts air

(resulting in a mix of 47.3%).

2.2.2 Pressure Generation

There are three nozzles within the exhalation block in the pneumatic subsystem. One for generating negative pressure in the patient circuit and the other two for generating positive pressure. The pressures generated from the three nozzles are controlled by three electronically controlled pressure regulators. The negative and one of the positive nozzle pressures can also be switched on and off rapidly with in-line (high speed) solenoid valves.

The other positive nozzle (the mean jet) is used to generate steady pressures in ventilation

(CPAP or PEEP pressures in conventional modes and mean pressures in HFO modes).

These three nozzles (or jets) are used in various combinations to generate all ventilation modes.

2.2.3 Conventional ventilation

In non HFO modes the negative (or reverse) jet is used in a steady mode to provide a small amount of flow to offset the inadvertent patient circuit pressure generated from the fresh gas flow of 8 lpm. The mean jet is also used in a steady mode to generate the base pressure level (CPAP or PEEP) and the forward jet is used to generate the PIP pressure during the inspiratory phase. The rise time of the inspiratory phase is controlled by dynamically controlling the forward jet pressure regulator rather than switching a steady pressure with the high speed valves.

This provides a smooth rise in pressure and allows user adjustable rise times rather than abrupt changes and pressure “ringing” which can result from high speed switching. The fall of the inspiratory wave is also controlled by the forward jet pressure regulator to bring the pressure down quickly and smoothly, using the high speed valves to do this would again result in inadvertent ‘ringing’ which causes difficulties for the monitor subsystem in trying to detect a patient breath attempt by monitoring the pressure alone. Once the pressure has been brought close to the base pressure, after about 100 ms, the forward jet solenoid is switched off to prevent any further artefact causing false triggering.

(Model A)

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Note that all jet pressures actually sum in the exhalation block, for example, to ventilate a patient with a PEEP pressure of 5 mbar and a PIP pressure of 30 mbar, the mean jet will be set to generate a continuous circuit pressure of 5 mbar and the forward jet will be set to generate a circuit pressure varying between zero (exp phase) and 25 mbar (insp. phase).

Since the jet pressures will sum, this will result in the desired patient pressure.

2.2.4 HFO ventilation

In pure HFO mode the mean jet pressure regulator is used purely to set the mean pressure. The forward and reverse jet pressure regulators are used to generate steady positive and negative delta P components that will be superimposed on the mean pressure. These components are switched quickly using the high-speed solenoid valves to generate the HFO pressures.

For example to ventilate a patient with a mean pressure of 10 mbar and a delta P pressure of 60 mbar, the mean jet will be set to generate a continuous pressure of 10 mbar, the forward jet will be set to generate a continuous pressure of 30 mbar and the reverse jet will be generating a continuous pressure of –30 mbar. The HFO rate is determined by the rate of switching between the forward and reverse pressures on the high-speed valves. Again, because the jet pressures sum, the resulting patient pressures will be switching between –

20 mbar and +40 mbar.

Mean HFO pressures up to 35mbar are required but the mean jet can only generate pressures up to about 20 mbars. To obtain higher mean pressures than 20mbars in HFO it is necessary to apply a higher pressure on the forward pressure regulator and a lower pressure on the reverse pressure regulator. Using this method, the desired mean must be less than half the desired delta p pressure plus 20 mbars.

See “Pneumatic Unit Schematic” on page 379.

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Description of Symbols

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3. Description of Symbols

Symbol

Description

Type BF connection (Situated on front panel)

Type B device (Situated on rear panel)

Read manual (Situated on rear panel)

Date of Manufacture (Appears on serial number label)

Do not dispose of as general waste (WEEE directive).

(Appears on serial number label).

EEC conformity marking showing compliance with the Medical

Devices Directive (Appears on serial number label)

Power Off

(Embossed on power switch)

Power ON

Indicates the mains power switch

Heavy, Lift with care (Situated on rear panel)

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Symbol

Description

Mains/Battery power indicator (Situated on front panel)

Indicates a warning in the manual

Observe anti static precuations

Indicates a note in the manual

Indicates a caution in the manual

Check list item.

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Equipment List

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4. Equipment list

To service the SLE5000 infant ventilator the service personnel will require the following equipment. Items marked with an SLE part number can be obatined by contacting the service department.

• Electronic engineers tool kit.
•	a/b Calibration analyser (calibrated in mbar) .......	SLE Part Nº: N2830
•	a Patient circuit ....................................................	SLE Part Nº: N5188
•	a Humidification chamber (MR220 ......................	SLE Part Nº: N3220
•	b Test lung ...........................................................	SLE Part Nº: N6647

•c Foam support pad

•a Digital Multimeter (1mv resolution)

•a 24V power supply

•a ‘Y’ piece tube connector fitted with 0-2 bar reliving regulator on one limb.

•a Assorted tubing to connect analysers to ventilator.

•cStatic protection wrist band

•cAnti-static protective bags (300mm x 300mm)

•	a Flow sensor cable.............................................	SLE Part Nº: N6635
•	a Flow sensor ......................................................	SLE Part Nº: N5201
•	a Exhalation block ...............................................	SLE Part Nº: N6622

•a Oxygen supply

•a Air supply

aNote all items marked with an ‘a’ are required for servicing and overhaul. Without these items the user will be unable to service or overhaul the SLE5000 ventilator.

bNote items marked with a ‘b’ are required to carry out the functional testing routine.

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Engineering Mode Software

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5. ENGMODE

The SLE5000 ventilator is calibrated via two calibration programs, one for the ventilator and one for the Touch screen. The calibration programs are accessed via the Controller Services panel in the user interface.

5.1 Accessing the Calibration Programs

Step 1 Press the Options and Service Data

Button.

¦

Step 2 Press the next button.

Step 3 Press the version button.

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(Model A)

Step 4 Press the Controller button.

Step 5 Enter the code supplied by SLE into the ventilator via the controller services panel to activate the required calibration program.

Begin psv is the A button.

End psv is the B button.

Apnea sup is the C button.

Enter your code here____________________

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5.2 Ventilator Calibration Program

The calibration program has four main functions.

1.Sensor Calibration

2.Jet Calibration

3.O2 & Flow System Calibration

4.Elapsed Time Reset.

5.Exit

5.2.1 Sensor Calibration

The sensor calibration panel allows the following sensors to be calibrated.

Controller

The setting of the Block and leak sensor Offset and Gain.

The setting of the Blender sensor Offset and Gain.

Monitor

The setting of the Blender sensor Gain.

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5.2.2 Jet Calibration

The jet calibration panel allows the forward jet, reverse jet and mean jet to be adjusted. Also contained within this panel are the controls to adjust the inspiratory and expiratory leading edges of the CMV wave form. Associated controls to set the ventilator in CMV or HFO mode are also displayed.

Layout for Version 3 to 3.2 software

Layout for Version 3.3 software

Warning: Version 3.3 software has a new parameter the “P Meas Filter”. This is a low pass filter which removes high frequency components from the displayed waveform.

This is required as the new N6623/33 pressure regulators produce a greater initial high frequency component. N6623/33 pressure regulator can only be used in conjunction with version 3.3 software.

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Warning: N6623/33 regulators cannot be used with version 3 to 3.2 software as the high frequency component can not be removed making the ventilator unusable.

Layout for Version 4 software

5.3 O2 & Flow System Calibration

The O2 & Flow System Calibration panel allows the calibration of the oxygen

monitoring system (2 point calibration, 100% and 21%) and the calibration of the flow system.

The flow system is a factory set system and requires an ETU-2 for calibration.

Note: For version 3.3 & 4 software O2 calibration time is 7 minutes.

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5.4 Reset Elapsed Time

The reset elapsed time panel allows the ventilators time counter to be reset to zero days and minutes.

This function is only used at the 20,000 hour overhaul.

5.5 Exit

The exit button will return the user to a DOS prompt. To return to the ventilator to its normal operating mode, restart the ventilator.

5.6 Touch Screen Calibration Program

The touch screen calibration program is accessed by the same method as for the calibration program. See ’5.1 Accessing the Calibration Programs’ on page 24.

Enter you code here____________________

Four the touch screen please follow the on screen instructions.

To return to the ventilator to its normal operating mode, restart the ventilator.

Warning: Failure to carry out the touch screen calibration correctly can cause the ventilator to become unusable. A failed touch screen calibration can only be corrected by connection of a specialist device. Please contact SLE or your distributor in this situation.

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