Eschmann SES2000 Service Manual

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SES2000

A UT O CLAVE

Service Manual

699215

ST-SM8l

Introduction

Description

Maintenance

Illustrated parts list

Read these Instructions before use

Keep these instructions in a safe convenient place for future reference. Read in conjunction with the Publications detailed in Section 1.5.

This Service Manual applies to the following Autoclave REF numbers. (Note: In the parts list section reference is also made to parts required for earlier versions) :-

SES 2000 STANDARD (from Serial Number - SCB8B0000, or SED8B0000 for non-CE) without printer : 87-028-04 87-028-20 87-028-36 87-029-05 87-029-13 87-029-21

87-029-37 87-029-45 87-029-54 87-029-62 87-029-70 87-029-78 87-029-86 87-030-03 87-030-11 87-030-27 87-030-43 87-030-60 87-031-03 87-031-68

with printer : 87-028-12 87-028-28 87-028-44 87-029-26 87-030-65 87-031-11

87-031-76

SES 2000 LONG (from Serial Number - LSCB8B0000, or LSED8B0000 for non-CE) without printer : 87-028-53 87-028-69 87-028-85 87-028-90 87-028-97 87-029-29

87-029-94 87-030-70 87-031-19 87-031-84 87-020-05 87-022-01 87-022-17 87-020-21 87-022-49 87-022-66

with printer : 87-028-61 87-028-77 87-030-75 87-031-27 87-031-92 87-020-13

87-022-09 87-022-25 87-020-29 87-022-58 87-022-74

(Note: The alpha parts of the SN are significant.)

Eschmann After Sales Service Department

The Eschmann After Sales Service Department is staffed and equipped to provide advice and assistance during normal office hours. To avoid delays when making enquires, please quote the Model and Serial Number of your Autoclave. Please ensure you include all alpha and numeric digits of the Serial Number. (NOTE: The Serial Number Plate is located inside the door in the top left hand corner).

For further information visit www.eschmann.co.uk

All correspondence relating to the after sales service of Eschmann Equipment to be addressed to :

UK Customers

Eschmann Equipment, Peter Road, Lancing, West Sussex BN15 8TJ, England. Tel: +44 (0) 1903 765040. Fax: +44 (0) 1903 875711.

Overseas Customers

Contact your local distributor. In case of doubt contact Eschmann Equipment.

Patents and Trade marks

The ESCHMANN name and logo are trade marks of Eschmann Holdings Limited. “Eschmann Equipment” is a trading name of Eschmann Holdings Limited. “SES2000” is a trade mark of Eschmann Holdings Limited.

Patents : Patents Pending plus - Pat. US5090033 and Pat. GB2238407

All rights reserved. This booklet is protected by copyright. No part of it may be reproduced, stored in a retrieval system or transmitted in any form or by any means, electronic, mechanical, photocopying, recording or otherwise without written permission from Eschmann Holdings Limited. The information in this publication was correct at the time of going to print. The Company, however, reserves the right to modify or improve the equipment referred to.

Service Manual

ST-SM8l November 2008

The CE marking affixed to the product certifies that it complies with the European Medical Devices Directive 93/42/EEC and related legislation.

SES 2000 AUTOCLAVE

CONTENTS

Page

Contents .. .. .. .. .. .. .. .. 3

Technical data .. .. .. .. .. .. .. 4

PART 1 INTRODUCTION

General .. .. .. .. .. .. .. .. 6

Associated publication .. .. .. .. .. 6

Servicing .. .. .. .. .. .. .. .. 6

PART 2 DESCRIPTION

General .. .. .. .. .. .. .. .. 7

Operating features .. .. .. .. .. .. 7

Operation cycle .. .. .. .. .. .. 9

Operation .. .. .. .. .. .. .. 9

Display messages .. .. .. .. .. .. 10

Error indication .. .. .. .. .. .. 11

General .. .. .. .. .. .. .. 11

Overheating .. .. .. .. .. .. 11

PART 3 MAINTENANCE

Fuses .. .. .. .. .. .. .. .. 15

Fault diagnosis and table .. .. .. .. 15

Parts replacement and adjustment .. .. 20

Removing cover .. .. .. .. .. .. 20

Refitting cover .. .. .. .. .. .. 20

Thermal fuse .. .. .. .. .. .. 20

Transformer.. .. .. .. .. .. .. 20

Controller board .. .. .. .. .. .. 20

Pressure door lock .. .. .. .. .. 20

Air valve .. .. .. .. .. .. .. 21

Door interlock switch .. .. .. .. .. 21

Solenoid door lock (CE only) .. .. .. 22

Heater cycling thermostat .. .. .. .. 22

Temperature sensors .. .. .. .. .. 22

Fill and Discharge valves .. .. .. .. 22

Solid state relay (Non-CE) .. .. .. 22

Solid state relay (CE only) .. .. .. 23

Mechanical relay (CE only) .. .. .. 23

Heating element .. .. .. .. .. .. 23

Printer interface board .. .. .. .. 23

Voltage regulators .. .. .. .. .. 23

Door seal .. .. .. .. .. .. .. 23

Pressure gauge .. .. .. .. .. .. 23

Discharge line filter .. .. .. .. .. 24

Printer .. .. .. .. .. .. .. 24

Special operating modes .. .. .. .. 24

Demonstration mode .. .. .. .. .. 24

Engineering mode .. .. .. .. .. 24

Set-up mode .. .. .. .. .. .. 25

Switch identities and function .. .. .. 25

Power-on modes .. .. .. .. .. 25

Page

Set-up procedure .. .. .. .. .. 26

Autoclave without printer .. .. .. 26

Autoclave with printer .. .. .. .. 26

Setting the Autoclave Serial Number 26 Entering the Autoclave Serial Number 27

Entering the date and time.. .. .. 27

Errors and error clearing .. .. .. .. 28

General .. .. .. .. .. .. .. 28

Control sensor selection .. .. .. .. 28

Autocheck .. .. .. .. .. .. .. 28

Routine Autoclave Calibration .. .. .. 28

General .. .. .. .. .. .. .. 28

Calibration procedure .. .. .. .. 29

Safety valve .. .. .. .. .. .. .. 29

Operational test .. .. .. .. .. .. 30

PART 4 ILLUSTRATED PARTS LISTS

Pipes and fittings, latest models .. .. .. 30

Illustrated parts list 1: Pipes and valves .. 31 Illustrated parts list 2: General spares .. 33 Illustrated parts list 3:

Heater and process controls .. .. .. .. 35

ILLUSTRATIONS

Fig. 1 SES 2000 Autoclave .. .. .. .. 6

Fig. 2 Autoclave General Arrangement .. 12

Fig. 3 Autoclave: Pipes and Valves .. .. 13

Fig. 4 Autoclave: Heater & Process Controls 14

Fig. 5 Door interlock microswitch .. .. 21

Fig. 6 Filter unit disassembly .. .. .. 24

Fig. 7 Switch identities and function .. .. 25

Fig. 8 Autoclave Controller boards .. .. 30

Fig. 9 Pipes and valves .. .. .. .. 32

Fig. 10 General spares .. .. .. .. .. 34

Fig. 11 Heater and process controls .. .. 36

Fig. A1-A5 Autoclave printer details .. .. 40

TABLE

Fault Diagnosis table .. .. .. .. .. 15

APPENDIX A

Autoclave printer .. .. .. .. .. .. 39

APPENDIX B

Schematic - Pipes and Valves .. .. .. 41

APPENDIX C

Schematic - Wiring .. .. .. .. .. 42

ST-SM8l Page 3 of 43

SES 2000 AUTOCLAVE

TECHNICAL DATA

(Standard Version)

Electrical Data

Supply 220/230/240V a.c. at 50/60Hz

110V a.c. at 50/60Hz

Nominal Loading @ 230V - 2kW (8.7A)

@ 110V - 1.4kW (12.7A)

Fuses Chassis

230/240V 10A, Part No.380003, (x2)

400mA, Part No.696181, (x1)

220V 13A, Part No.380002, (x2)

400mA, Part No.696181, (x1)

110V 16A, Part No.111940, (x2)

800mA, Part No.380004, (x1)

Relay board T2A, 250V (x1)

Safety standards

IEC 1010-1:1990 IEC 601-1:1977 BS5724:Part 1:1979 ESCHLE (Second Edition 1986) IEC 601-1-2 (1993)

Dimensions

Autoclave Width 460mm

Length 461mm Height 360mm

Chamber Diameter 200mm

Length 348mm (max) Capacity 10.6 litres

Trays Width 183mm

Length 282.6mm Height l7mm

Tray Loading 1.5 kg per tray

Weight (approx.)

Net 27.5kg Shipping 32.0kg

Symbols

For use with alternating current

Caution Hot Surface

Sterilizing Data

Sterilizing time

At 134/137°C 3 mins 20 sec. At 121/124°C 15 mins

Typical overall cycle 134°C : 13 minutes time (D indicates 134°C : 30 minutes (D) drying included) 121°C : 24 minutes

121°C : 41 minutes (D)

Note: Overall cycle times may vary depending on machine and loading conditions.

Nominal Operating pressures:

134°C cycle - 3.14 bar abs 121°C cycle - 2.11 bar abs

Water reservoir capacity 2.0 litres

Caution refer to accompanying

documents

Sterilising cycle without drying phase (NB. temperature = cycle temperature)

Sterilising cycle with drying phase (NB. temperature = cycle temperature)

Page 4 of 43 ST-SM8l

SES 2000 AUTOCLAVE

TECHNICAL DATA

(Long Version)

Electrical Data

Supply 230Vac at 50/60Hz

Nominal Loading @ 230V - 2.75kW (12A)

Fuses Chassis

15A, 250V, (x2) Part No. 301871 400mA, Part No. 696181

Relay board T2A, 250V (x1)

Safety standards

IEC1010-1 (1990) IEC 601-1-2 (1993)

Sterilizing Data

Sterilizing time

At 134/137°C 3 mins 20 sec.

At 121/124°C 15 mins

Typical overall cycle 134°C : 13 minutes time (D indicates 134°C : 30 minutes (D) drying included) 121°C : 24 minutes

121°C : 41 minutes (D)

Note: Overall cycle times may vary depending on machine and loading conditions.

Dimensions

Autoclave Width 460mm

Length 650mm* Height 360mm

* Feet spaced to fit 600mm worktop

Chamber Diameter 200mm

Length 500mm (max) Capacity 15.6 litres

Trays Width 180mm

Length 457mm Height 24mm

Tray Loading 3.0 kg per tray

Weight (approx.)

Net 35.5kg Shipping 40kg

Symbols

For use with alternating current

Caution Hot Surface

Caution refer to accompanying documents

Nominal Operating pressures:

134°C cycle - 3.14 bar abs 121°C cycle - 2.11 bar abs

Water reservoir capacity 2.0 litres

Sterilising cycle without drying phase (NB. temperature = cycle temperature)

Sterilising cycle with drying phase (NB. temperature = cycle temperature)

ST-SM8l Page 5 of 43

Part 1

SES 2000 AUTOCLAVE

PART 1 INTRODUCTION

GENERAL (Fig. 1)

1.1 This Manual contains descriptive, maintenance and spare parts information for the SES 2000 Autoclave.

1.2 The autoclave is a portable, electrically operated steam unit designed for sterilizing unwrapped instruments, utensils and other items. It operates automatically at the touch of a single programme selector touch button, and has four programmes 134°C and 121°C, both with and without drying.

1.3 The autoclave is available with short or long chambers and with or without an integral printer for recording details of the sterilizing cycle. Details of the printer are given in Appendix A.

1.4 Some of the information in this manual refers to models built to comply with the Medical Devices Directive and carry the CE mark to indicate compliance. Where the section of this manual refers only to these models it is marked ‘CE ONLY’

ASSOCIATED PUBLICATION

1.5 Separate installation and user instructions are given in the SES 2000 Autoclave Instructions for Use, ST-IM30.

SERVICING

1.6 Ensure that routine servicing is carried out at regular intervals by either Eschmann trained personnel or suitably trained engineers only, otherwise the warranty could be infringed.

1.7 Keep the Instructions for Use and this Service Manual readily accessible for reference purposes prior to and during operation, cleaning and servicing of the autoclave.

If ‘Sterile Water for Irrigation’ is not being used then Eschmann strongly recommend the use of either distilled water, deionized water, purified water or water treated by the reverse osmosis process. These types of water are low in dissolved solids and can help reduce the effects of tap water detailed below.

DO NOT USE TAP WATER, this is high in dissolved solids and can deposit lime scale, block filters and cause damage to the pressure vessel.

Eschmann also recommend that the reservoir is drained, allowed to dry and is refilled on a weekly basis, with the type of water detailed in ‘a’ (or ‘b’) above. At every service interval the reservoir must

be removed, be thoroughly cleaned and dried,

and then refilled. This will reduce the build-up of contaminants in the water that may cause blocked filters and/or damage to the pressure vessel. Your local Health Authority may suggest that you change the reservoir water more frequently. Eschmann advise you to follow your local Health Authority’s recommendations.

1.9 Check the drain tap is not damaged or leaking and return the tube and drain tap into its location under the autoclave to prevent damage or accidental opening.

IMPORTANT NOTE

If the drain tap is found to be damaged or leaking, replace it as soon as possible (order Part No. 380010 directly from Eschmann). When fitting the new tap, drain the reservoir first and ensure it is placed on the drain tube correctly, see Fig. 3.

CAUTION

In common with other systems containing static water reservoirs, water used in this unit can become contaminated over a period of time, or following an aborted cycle, and should be treated as a potential risk of infection.

1.8 Eschmann recommend filling the reservoir with ‘Sterile Water for Irrigation’. This is low in dissolved solids and has a low microbial count. In the U.K. the Department of Health recommend that ‘Sterile Water for Irrigation’ is used in bench-top Autoclaves (NHS Estates document HTM2031).

Page 6 of 43 ST-SM8l

Fig. 1 SES 2000 Autoclave

SES 2000 AUTOCLAVE Part 2

PART 2 DESCRIPTION

GENERAL (Fig 2)

2.1 The autoclave is a portable steam unit heated by a single element and can be supplied to suit any of the mains supplies shown in Technical Data.

2.2 The unit is electronically controlled and offers a selection of sterilizing programmes as follows:

 134°C without the drying phase  121°C without the drying phase  134°C with the drying phase  121°C with the drying phase

For sterilizing pressures and drying times refer to Technical Data.

2.3 The required sterilizing programme is selected and started by pressing the appropriate programme button on the front panel of the unit, following which the sterilizing/drying cycle proceeds automatically until complete. If the autoclave has a printer, the printer will start automatically when the programme button is pressed.

2.4 Indication of cycle status is provided by a digital display. If an error should occur during a cycle this also is indicated by the digital display.

OPERATING FEATURES (Figs 2, 3 and 4)

2.5 The following equipment, designed for control and/or protection, is incorporated in the autoclave:

 Pressure Gauge (Fig. 3 item 3). This is used to

indicate pressure inside chamber.

 Process Display Window (Fig. 2 item 1). The

digital display indicates the temperature inside the chamber and also provides simple messages for the user which indicate the stages through the cycle, and also error conditions, should any occur.

 Four Programme Selector Buttons (Fig. 4, item

15). These are used to select and start a particular cycle. They can also be used to place the machine in the ‘Demonstration’ or ‘Engineering’ mode as described later.

 Green Light Emitting Diodes (LED’s) (Fig. 4 item

16). There are four LED’s and these are used primarily to indicate the point at which the required sterilizing cycle can be selected and started and, when this has been done, to indicate which particular cycle is in progress.

 Power On/Off Switch (Fig. 4 item 17). This switch

controls mains power supply to the unit.

 Overheat Warning Lamp (Fig. 4 item 18). The

illumination of this warning lamp indicates that the protective thermal fuse (Fig. 4 item 7) has operated.

 Door Latching Handle (Fig. 2 item 4). This handle

operates the door mechanism to secure the door in the locked position against the chamber mouth.

 Door Secondary Latch (Fig. 2 item 6). This engages

a safety catch to ensure the door does not fly open should there be residual pressure in the chamber when the door latching handle is operated. It is also used to keep the door slightly open during the drying part of the cycle.

 Door Interlock Microswitch (Fig. 4 item 6). This is

used to signal to the controller that the door is properly closed. It is operated via a simple adjustable mechanism and should operate just as the door becomes fully closed.

 Pressure Door Lock (Fig. 3 item 7). This is a safety

device designed to ensure that the door cannot be opened if the internal chamber pressure exceeds

approximately 0.2 bar (3.0 lbf/in

). The device comprises a spring-loaded plunger driven by the chamber pressure via a rubber diaphragm.

 Solenoid Door Lock (Fig. 4 item 22) ‘CE ONLY’

see note page 38. This lock prevents the door being opened by the operator, once the cycle has been started. The lock holds the door closed until the sterilizing cycle is complete. It will also keep the door closed under all fault conditions. As absence of power to the unit constitutes a ‘fault’ this also means that the unit power switch must be switched ‘on’ in order to open the door.

Note: If it is necessary to override the electrical door lock to clear an error code, this is done by switching off the power switch then, after a few seconds, switching it back on again while pressing and holding any one of the programme selector buttons on the front panel.

 Water Reservoir (Fig. 2 item 17). This is used to

hold distilled, deionized, or purified water before being admitted to the chamber via the water fill valve, and to receive the hot water and steam vapour emitted from the chamber towards the end of the cycle, via the discharge valve.

 Heating Element (Fig. 4 item 1). This consists of

a single immersion element inside the chamber. It is controlled via the solid state relay and heater thermostat. Refer to the Technical Data for heater element loading.

 Solid State Relay (Fig. 4 item 8) 'Non-CE Units' see

note page 38. This is switched on and off by the controller as necessary and is the means of controlling the heater output. The solid state relay is fitted on the protection relay printed circuit board which is mounted on the internal bulkhead and is rated at 25A, 400V (repetitive reverse blocking voltage) or such as to be suitable for use on a 230V a.c. supply.

 Solid State Relay (Fig. 4 item 8A) ‘CE ONLY’ see

note page 38. On CE units the Solid state relay is fitted on the relay protection board.

 Mechanical Relay (Fig 4 item 21) ‘CE ONLY’ see

note page 38. This relay isolates the heater circuit

ST-SM8l Page 7 of 43

Part 2 SES 2000 AUTOCLAVE

PART 2 DESCRIPTION

from the electrical supply prior to cycle start, and following cycle completion, to give additional protection.

 Heater Cycling Thermostat (Fig. 4 items 2 and 3).

This is connected in series with the solid state relay to the heating element. It is operated by a fluid-filled capsule clamped to the heating element which will cause the thermostat cut-out device to operate if the heater surface temperature exceeds a preset limit, safeguarding the autoclave. The cut-out is self-resetting and will remake when the temperature drops. Note that operation of the thermostat cut-out during the drying phase of the cycle is quite normal.

 Thermal Fuse (Fig. 4 item 7). This is connected so

as to remove power from the heater if a serious overheating condition should occur. Note however that operation of this device is unlikely to occur since the heating element is already protected by the heater cycling thermostat.

 Fuses (Fig. 4 items 9 and 10). The unit has four

fuses as follows:  Three fuses on the rear panel of the cabinet,

rated as shown under Technical Data. The two larger fuses are connected into the ‘mains’ supply to the unit. The smaller fuse protects the primary circuit of the transformer.

 A fourth fuse, on the printed circuit board and

rated at 2A, protects the secondary circuit of the transformer and other parts of the controller.

Note: Units with a printer have an extra fuse which

is fitted on the printer PCB.

 Transformer (Fig. 4 item 11). This converts the

incoming mains voltage to 20V a.c. to operate the controller and the water fill and discharge valves. A non-resetting thermal fuse is fitted in the transformer secondary; check for secondary ‘continuity’ when fitting a replacement transformer.

 Water Fill Valve (Fig. 3 item 1). This valve is used

to control the water fill sequence. It is electrically operated from a 24V d.c. supply which is generated and signalled from the controller.

 Discharge Valve (Fig. 3 item 2). This valve is used

principally at the end of the sterilizing cycle to allow water and steam vapour from the chamber to pass back into the reservoir. It is also operated at other times during the cycle. The valve is electrically operated from a 24V d.c. supply generated on the controller board.

 Printer Interface Board (Fig. 4 item 20). This

board is fitted in autoclaves which have a printer. The board interfaces the printer with the integrated microprocessor-based control board.

 Air Valve (Fig. 3 item 6). At the start of a cycle the

chamber is full of air, and for a satisfactory result almost all of this has to be removed. This is done by a small air valve. This valve contains a ball and spring which allows air displaced by the steam generated in the chamber to pass out into the reservoir. Once steam starts to pass the ball, the ball then lifts and seals. A small ‘bleed’ remains, however, and it is quite normal for small quantities of steam to escape into the reservoir throughout the cycle.

 Safety Valve (Fig. 3 item 5). This is fitted on the

manifold at the rear of the chamber, and is factory set to release excess pressure from within the chamber. It is a primary safety device and should not be readjusted.

 Temperature Sensor (Fig. 4 item 4). This is used

to sense the chamber temperature and is fitted on the manifold in a position where the manifold is exposed to a small volume of steam bled through the air valve. This device with its associated leads, mounting plate and connector, together form a single assembly. The sensor controls the temperature within the chamber and also the display temperature.

 Thermocouple Entry Port (Fig. 4 item 19). This

can be used to insert a thermocouple into the chamber ‘drain line’ to allow the operating temperature to be measured and adjusted if necessary.

 Water Drain Pipe (Fig. 3 items 8 and 9). This

provides a means of emptying the reservoir for cleaning or for transportation.

 PCB Controller Board (Fig. 4 item 12). The

autoclave has an integrated microprocessorbased controller. The controller handles every aspect of management of the machine which includes operation and control of the digital display, the light emitting diodes and response to the programme selection push buttons. The controller receives information from the temperature sensor and from the door interlock switch and is able to detect a number of errors, and the times relative to the cycle run when these occur. In addition to controlling the sterilizer in the user mode, the controller also supports a ‘demonstration’ and an ‘engineering’ mode (see Special Operating Modes). The controller operates the heater via the solid state relay and also controls the operation of the water fill and discharge valves. A detailed knowledge of the operation of the controller is not necessary in order to service the autoclave; it is a replaceable sub-assembly and should only be changed as a last resort.

Page 8 of 43 ST-SM8l

SES 2000 AUTOCLAVE Part 2

PART 2 DESCRIPTION

 Integral Printer (Fig. 2 item 22). If the autoclave

has a printer, it will start automatically when the programme button is pressed and will print out a hard copy of the sterilization cycle. Details of the printer are given in Appendix A to this Manual.

OPERATION CYCLE

2.6 A detailed knowledge of the operation of the autoclave is not necessary to be able to repair it effectively; however, a basic understanding of the various processes of the unit operation which occur during a cycle is given in the following paragraphs.

Operation

CAUTION Ensure that the reservoir is filled with water before switching-on.

Note: When filling the reservoir, water treated by

reverse osmosis can be used as an alternative to distilled, or deionized water.

2.7 Power to the unit is switched on by selecting the power switch (0-I) to I. If the chamber door is open there now follows a single high-pitched audible signal accompanied by the display ‘SES’, followed by the number of cycles, and finally ‘ready’ (or time of day if printer fitted) in the display window.

2.8 If the door is closed, when power is switched on, the display will alternate between ‘test’ and ‘door’. In order to continue with the cycle the door must be opened, at which point the display will change to ‘ready’ (or time) and the four green indicators will come on.

2.9 After the work trays have been put in the chamber and the door closed, a programme can be selected and initiated by pressing one of the programme selector buttons. If the autoclave has a printer it will automatically start when the programme selector button is pressed.

2.10 When the door is closed, with power switched on, this is sensed by the controller via the door interlock switch. If any attempt is made to open the door once the cycle has begun, the display ERR2 will appear, and an audible signal will sound. Under these circumstances it is necessary to switch the autoclave off and clear the error as detailed in section 3.41.

2.11 On selecting the programme, ‘FiLL’ will be displayed, indicating that the cycle has begun. Once the chamber has filled with water from the reservoir, the display will change to ‘HEAt’.

2.12 If all conditions are satisfactory, the controller will set-up the operating parameters for the cycle selected, and will switch on the heater.

2.13 The heater is controlled by a system which ensures that the operating temperature is reached with minimal overshoot. Initially the heater will be ‘on’ continuously and the measured temperature will be displayed. Note, however, that the system does not register temperatures below 92°C; hence the symbol ‘HEAt’ will appear and remain on display until a temperature of 92°C is reached.

2.14 Temperatures are displayed and measured to

0.1°C. In addition, the controller uses signal averaging to ensure a stable, accurate display.

2.15 Control of the cycle is now fully automatic with temperature information being collected via the temperature sensor. Timing is controlled by the controller and cycle times cannot be adjusted. By comparing measured values with known time/temperature relationships, the controller is able to detect faults and display them as error codes, this is accompanied by an audible warning signal. Note: Pressing the bottom 121°C button will display the cycle counter.

2.16 To ensure efficient sterilization, the autoclave operates at temperatures slightly above the minimum recommended. Hence, the operating temperature for the 121°C cycle is set to 122.5°C, and the 134°C cycle is set to 135.5°C.

2.17 As the cycle enters the sterilizing phase the display shows an ‘S’ (flashing) as a prefix to the displayed temperature. At the end of the sterilizing phase the heater is turned off and the discharge valve is opened. At this point, a certain amount of noise from the reservoir is quite normal.

2.18 Once the controller detects that chamber temperature has fallen to a safe level, the flashing display ‘End’ appears and an audible signal sounds to indicate that the cycle is complete. When the chamber door is opened the display will show ‘ready’.

Note: If the autoclave has a printer, the printout will include the following details:

 Manufacturer’s name  Autoclave type and serial number  Sterilization cycle type e.g.. 134°C without drying  Date and time for the start of sterilization cycle  Counter indication (five digits with leading zeros)  Sterilization cycle time and temperature

information

 Sterilization cycle ended message  Time and date for the end of the sterilization cycle

Operating information relating to the printer is given in Appendix A to this Manual.

ST-SM8l Page 9 of 43

Part 2 SES 2000 AUTOCLAVE

PART 2 DESCRIPTION

2.19 The overall time for the cycle is not fixed and depends on many factors such as the supply voltage, the load and the ambient temperature. However, the controller will ensure a satisfactory sterilization cycle even when these factors vary over wide ranges.

2.20 If a cycle employing a drying phase is selected, operation to the end of the sterilizing phase is as described above. After discharge of steam and water back into the reservoir, however, the display ‘dry’ appears accompanied by a rapid intermittent audible signal over a two second period to indicate the beginning of the drying phase. At this point the operator should first open the chamber door then push it towards the closed position again until it just rests lightly against the door safety catch. This leaves a sufficient gap to allow vapour to escape.

2.21 The drying phase is about 17 minutes long during which the heater is operated at low power. Operation of the heater thermostat is quite normal during this period. At the end of the drying phase the display ‘End’ will appear for approximately 10 seconds followed by ‘ready’, assuming that the door has been opened as described in section 2. 20.

DISPLAY MESSAGES

2.22 Throughout a given cycle the following symbols may appear as a digital display:

Display Meaning

ERR 2 Door opened after cycle has been

started

door/test Test door interlock switch (see

section 2. 23)

door, then Chamber door open and a cycle cycle counter, button has been pressed (audible then ready beep given)

Time of day Programme can now be selected or 'rEAdY' (printer version shows 'Time', non-

printer version shows 'rEAdY') FiLL Chamber being filled HEAt Chamber temperature below 92°C 92-136 Heating to sterilizing stage S-135.5 ‘S’ flashing, indicates sterilizing

begun and timing started cond Steam being discharged and

condensed * dry Load being dried End Cycle complete cycle counter Pressing the bottom 121°C button

after a cycle has started will display

the cycle counter

* If programme ‘with drying’ is selected

Page 10 of 43 ST-SM8l

SES 2000 AUTOCLAVE Part 2

PART 2 DESCRIPTION

ERROR INDICATION General

2.23 If an error should occur during a cycle, one of the following error code symbols will be displayed:

Display Cause

* ‘ELECt’ Temporary failure of mains power

supply to unit

LoH20 Water has failed to enter chamber

from reservoir

H2O Water level in chamber has dropped

slightly

door/test Door closed and power on

ERR2 - Door opened after cycle started

- Door not fully closed at beginning of cycle

- Door switch faulty (see door/test)

Error - Heater not working

- Temperature either excessively high or low

- Fault with microcomputer system

- Low temperature during sterilization

* The display ‘ELECt’ will occur at any time after switching-on power and beginning a cycle if the power supply has been interrupted and then restored.

2.24 If an error occurs during a cycle, the controller will cancel the cycle (see Fault Diagnosis, and Errors and Error Clearing in Part 3).

Note: If the autoclave has a printer, and if an error occurs during a sterilization cycle, the printer will printout the date and time, the message ‘Cycle Failed’ and the appropriate error code:

 Err 1* Clock Fault or Faulty temperature/channel  Err 2 Door open during cycle  Err 3 Chamber did not fill with water (LoH2O)  Err 4 Water loss early in cycle (H2O)  Err 5 No heat  Err 6 Control temperature low  Err 7 Control temperature high  Err 8 Monitor temperature low  Err 9 Monitor temperature high

Operating information relating to the printer is given in Appendix A to this Manual.

Overheating

2.25 In the unlikely event of overheating, the red overheat warning lamp on the front panel will illuminate and the heating element will be switched-off by a thermal cut-out device.

Schematic diagrams

2.26 Appendix B shows a schematic diagram of the 'Pipework and Valves' and Appendix C shows a schematic diagram of the 'Electrical connections'.

ST-SM8l Page 11 of 43

Part 2 SES 2000 AUTOCLAVE

PART 2 DESCRIPTION

1 Process display window 2 Pressure display window 3 Control panel 4 Door latching handle 5 Pressure door 6 Secondary door latch 7 Door cover 8 Seal retaining rim 9 Seal retaining disc 10 Door seal 11 ‘O’-ring (on older models) 12 Aerotight nut # 13 Door safety catch 14 Pressure chamber 15 Work tray 16 Reservoir access cover 17 Reservoir 18 Cover screw (self-tapping)

# Now replaced by nut and spring washer, see Parts List 2, item 27.

Fig. 2 Autoclave General Arrangement

19 Unit cover 20 Front panel 21 Chassis 22 Printer 23 Link

Page 12 of 43 ST-SM8l

SES 2000 AUTOCLAVE Part 2

PART 2 DESCRIPTION

Push to open

1 Water fill valve 2 Discharge valve 3 Pressure gauge 4 Chamber manifold 5 Safety valve 6 Air valve

NOTE: On the latest units the copper pipes and fittings have been replaced by plastic tubing and modified fittings. Refer to the parts list for more details.

Fig. 3 Autoclave: Pipes and Valves

ST-SM8l Page 13 of 43

Press to close

Current drain tap. Note correct orientation and location on drain tube.

7 Pressure door lock 8 Reservoir drain tube

9 Drain tap 10 Filter unit 11 Coil

Part 2 SES 2000 AUTOCLAVE

PART 2 DESCRIPTION

Note: Items 4 and 4a are

fitted to the underside of chamber manifold but shown here for clarity.

1 Heating element 2 Thermostat sensor bulb 3 Cycling thermostat 4A Temperature sensor* 4 Sensor retaining plate 5 Water level sensor 6 Door interlock microswitch 7 Thermal fuse 8 Solid state relay 8A Solid state relay

(CE ONLY see note page 38) 9 Fuses (10A, 15A or 16A) 10 Fuse (400mA or 800mA)

* Autoclaves which incorporate a printer are fitted with two temperature sensors

Fig. 4 Autoclave: Heater and Process Controls

Page 14 of 43 ST-SM8l

11 Transformer 12 PCB (controller) 13 Terminal block 14 Power supply cable 15 Programme selector buttons 16 Light emitting diodes (LED’s) 17 Power on/off switch 18 Overheat warning lamp 19 Thermocouple entry port 20 Printer interface board 21 Mechanical relay (Relay protection

board) (CE ONLY see note page 38)

22 Solenoid door lock (CE ONLY see

note page 38)

SES 2000 AUTOCLAVE Part 3

PART 3 MAINTENANCE

FUSES (Fig. 4 and 8 )

3.1 The autoclave is protected by four fuses. Three mains supply fuses are fitted on the autoclave back panel (Fig. 4). The fourth fuse (process and control circuits) is fitted on the controller board inside the autoclave (Fig. 8). Printer versions have an extra fuse on the printer PCB. All fuse ratings are given in Technical Data, pages 4 and

FAULT DIAGNOSIS

3.2 The following table sets out a number of typical ‘faults’ which could occur, and indicates likely causes and how to rectify them. For maintenance procedures refer to Parts Replacement And Adjustment. Cross references in the ‘Remedy’ column refer to paragraphs under Part Replacement and Adjustment.

WARNINGS

Switch-off and disconnect mains power supply before removing the autoclave cover, or doing

maintenance procedures. During certain procedures mains voltage may have to be present with

the cover removed and extreme care should be taken to avoid contact with mains voltage.

Check that chamber is at atmospheric pressure before opening the door.

Should the door be opened beware of possible very hot water or steam escaping

from the chamber.

Fault Diagnosis Table

Fault Possible Cause Remedy

(1) Nothing happens when power (a) Mains supply failure. (a) Check mains supply, also

switched on (No display). plug and supply cable

for loose connections

or breaks. (b) Main fuses blown (rear panel). (b) Replace fuse(s)*. (c) Faulty power switch. (c) Replace power switch. (d) Thermal fuse blown (d) Replace thermal fuse. (e) Transformer failed. (e) Check transformer secondary

voltage (20V a.c. rms).

Replace transformer if

output is zero (section 3.6). (f) Short circuit on (f) Check sensor, fill valve, vent

24V circuit. valve etc. for short circuit

Replace where necessary.

*Note: Blown fuses can indicate further problems. Always investigate the reason for any fuse blowing, but bear in mind that fuses can ‘age’ and blow for no other reason.

(2) Door cannot be opened. (a) Pressure door lock jammed. (a) Replace pressure door lock

(section 3.8). To open

chamber door, disconnect

body from unit (section 3.10)

and pull it backwards so that

the locking bolt clears the

door.

Continued

ST-SM8l Page 15 of 43

Part 3 SES 2000 AUTOCLAVE

PART 3 MAINTENANCE

Fault Possible Cause Remedy

(b) Pressure in chamber. (b) Switch-on power to release

pressure in chamber.

clean or replace air valve (section 3.9).

(3) Chamber will not fill (a) No water in reservoir. (a) Fill reservoir.

('LoH2O' displayed). (b) Water fill valve or (b) Empty reservoir, strip

associated pipes pipework and clean. Clean blocked reservoir. Refill with distilled

water.

closed position

(4) Display still shows ‘door’ (a) Door not correctly closed (a) Close door

after programme selector (b) Door interlock (b) Adjust switch lever position, button pressed microswitch out or fit new microswitch if

of adjustment adjustment seems to be

correct (section 3.10)

(5) Display shows ‘ERR 2’ (a) Door not properly (a) Clear error as detailed

after programme selector closed in section 3.41 button pressed and restart cycle.

(b) Door opened after (b) Repeat (a)

a cycle started

adjustment or fit new microswitch

(section 3.10).

WARNING Should door be opened beware of possible hot water leaking from chamber.

(6) Safety valve (a) Air valve sticking (a) Clean or replace air valve

operates even (section 3.9) though temp is (b) Safety valve fault (b) Fit new safety valve (see below 136°C section 3.50 and 3.51). (See also Fault (15) (c) Check calibration of (c) See Routine

134°C cycle Calibration Procedure

(section 3.44)

(d) Re-calibration (d) As (c) above

needed

(e) Temperature sensor (e) Fit new temperature sensor

fault (section 3.13)

(f) Controller fault (f) Fit new controller board

(section 3.7)

Continued

Page 16 of 43 ST-SM8l

SES 2000 AUTOCLAVE Part 3

PART 3 MAINTENANCE

Fault Possible Cause Remedy

(7) 'LoH2o' or ‘Error’ (a) No water in chamber (a) Ensure chamber water level

displayed before sensor is clear of obstructions. sterilizing temp. Also, ensure sensor is not reached dirty or corroded.

(b) Water fill valve is (b) Drain reservoir and fit new

leaking water fill valve (section 3.14)

valve or fit a new one (section 3.14)

(d) Temperature sensor fault (d) Fit new temperature sensor

(section 3.13)

(e) Solid state relay failed (e) Fit new solid state relay

(section 3.15 or 316)

(f) Heater failed (f) Fit new heater if resistance of

element is not approx. 30ohms

(g) Controller fault (g) Fit new controller board

(section 3.7)

(8) 'H2O' or ‘Error’ displayed (a) Steam leak (a) Carefully check for steam

after sterilizing temperature leak and rectify reached and fall below set (b) Water fill valve (b) As for Fault (7) (b). temperature leaking

leaking

(d) Temperature sensor (d) As for Fault (7) (d).

fault

(e) Solid state relay failed (e) As for Fault (7) (e)

(No voltage across heater) (f) Heater failed (f) As for Fault (7) (f) (g) Controller fault (g) As for Fault (7) (g) (h) Voltage regulator not (h) Secure voltage regulator

properly mounted, or loose (see also section 3.20)

(9) Temperature differs (a) Recalibration required (a) Follow Routine

and 'Error' displayed Calibration Procedure

(section 3.44)

(b) Air valve (b) Clean or fit new air valve

partially blocked (section 3.9) (c) Controller fault (c) As for Fault (7) (g). (d) Voltage regulator not (d) As for Fault (8) (h).

properly mounted, or

loose (e) Temperature sensor (e) Fit new temperature sensor

fault (section 3.13) and recalibrate

(section 3.44)

Continued

ST-SM8l Page 17 of 43

Part 3 SES 2000 AUTOCLAVE

PART 3 MAINTENANCE

Fault Possible Cause Remedy

(10) No discharge of (a) Discharge valve fault (a) Test valve, using ‘Engineering

steam/water at Mode’. Replace if faulty end of cycle (b) Wiring fault (b) Ensure connections to

discharge valve are sound (c) Blockage in discharge line (c) Strip pipework and clean (d) Controller fault (d) Replace controller board

(section 3.7) (e) Filter blocked (e) Clean or replace filter

(section 3.23)

(11) Cycle time (a) Low mains voltage (a) Check supply to autoclave

excessive (b) Autoclave overloaded (b) Avoid overloading. See tray compared with loading shown in usual value Technical Specification.

of cycle

(12) Unusual (a) Controller failed to (a) Switch-off power, wait for

display when re-set properly approx. 5 seconds and first switching switch on again on power (b) Controller fault (b) Replace controller board

(section 3.7)

(13) Display shows (a) Temporary mains (a) Carry out error cancellation

‘ELECt’ failure during cycle procedure (section 3.41) then

reselect and restart cycle

(14) Leakage of water (a) Door gasket not (a) Clean mating surface and

from chamber sealing correctly gasket around door with a door and ‘H2O’ soapy cloth. If leakage displayed persists, replace gasket

(b) Check centre nut (b) Replace ‘O’-ring

and seal (Fig. 2 item 11)

(15) Safety valve (a) Dirt on valve seat (a) With low pressure in chamber

leaks (See also CAREFULLY operate valve Fault (5) by hand. If leakage persists,

replace safety valve (see

section 3.50 and 3.51). (b) Check pressure gauge (b) Recalibrate controller board

display to see if (section 3.44) sterilizing temperature is set too high

Continued

Page 18 of 43 ST-SM8l

SES 2000 AUTOCLAVE Part 3

PART 3 MAINTENANCE

Fault Possible Cause Remedy

(16) Excessive noise (a) Positioning of discharge (a) Check cooling coil position

from reservoir line in reservoir during discharge incorrect

(17) Thermal fuse (a) Failure of heater thermostat (a) Replace heater thermostat

blows and cutout to reset automatically (section 3.12) overheat warning (b) Wiring fault (b) Look for evidence of lamp illuminates short circuits and correct

as necessary

in solid state relay (section 3.15 or 3.16)

(d) Thermal fuse fault (These (d) Replace Thermal fuse

can age with use) (section 3.5)

(18) Pressure gauge (a) Gauge fault (a) Adjust against a known

reads incorrectly pressure source, or replace (too high or too low) pressure gauge (section 3.22)

(b) If gauge reads high - (b) Clean or replace air valve

air valve sticking (section 3.9). Check temp-

erature calibration

thermocouple thermocouple and recalibrate calibration faulty (section 3.44)

(19) Door stiff to (a) Door mechanism needs (a) Lubricate hinge pivots with

open lubricating silicone compound

(b) Gasket mating surfaces (b) As for Fault (14) (a)

sticking

ST-SM8l Page 19 of 43

Part 3 SES 2000 AUTOCLAVE

PART 3 MAINTENANCE

PARTS REPLACEMENT AND ADJUSTMENT

WARNING Switch-off and disconnect mains power supply before removing autoclave cover, or doing maintenance procedures.

Check that chamber is at atmospheric pressure before opening the door. When the door is opened beware of possible very hot water or steam escaping from the chamber.

IMPORTANT NOTE: On the latest units the copper

pipes and related fittings have been replaced by silicone tubing and modified fittings. Please refer to the parts list for details during any part replacement.

Removing Cover (Fig. 2, item 19)

3.3 To remove the cover:

CAUTION An earth lead is connected between the terminal block and the earth stud inside the rear of the cover. Disconnect the lead before removing the cover completely.

a Unscrew and remove the four cover screws (two

on each side) from the casing lower edge. b Remove reservoir access cover. c With unit facing towards you, remove the cover -

lifting it from the rear of the unit first.

Refitting Cover (Fig. 2, item 19)

3.4 To refit the cover: a Re-connect the earth lead between the terminal

block and the earth stud inside the rear panel of

the cover. b Carefully locate the front upper flange of the cover

in the small gap between the stainless steel

dividing plate and the front panel of the unit, then

lower the cover down in position. c Refit the four cover screws and the reservoir

access cover.

Thermal Fuse (Fig. 4, item 7)

3.5 Detach the two female push-on connectors. Unhook one end of mounting spring and remove thermal fuse assembly. Fit replacement in reverse order and ensure that fuse body is located at the bottom of the chamber about half way between the front and the back.

Transformer (Fig. 4, item 11)

3.6 Detach the transformer connections, noting the position of each one. Remove the transformer securing

nuts and bolts. The replacement transformer should be an identical unit. To install replacement transformer, reverse the removal procedure.

Controller Board (Fig. 4, item 12)

3.7 Note the orientation and position of the plugs connecting the controller board to the unit, and then disconnect them. Remove the bolt securing the controller board voltage regulator to the dividing panel. Remove the four bolts securing the controller board to the dividing panel, and remove the control board, complete with the regulator. To fit replacement, reverse the removal procedure. When mounting the voltage regulator, coat the mating surface with a thin layer of zinc oxide-based heat transfer compound and ensure that the bolt is well tightened. When tightening the controller board securing nuts, ensure that control switches do not foul the holes in the front panel through which they protrude.

Note

 Avoid overtightening the nylon nuts securing the

controller

 When a new controller is fitted, it will be necessary

to recalibrate it to suit the temperature sensor fitted in the machine (see Routine Calibration Procedure).

Pressure Door Lock (Fig. 3, item 7)

3.8 To remove the pressure door lock for adjustment or replacement proceed as follows: From front of pressure door lock remove screw-slotted locking bolt. Detach plumbing connection from rear of lock body, then slacken the two hexagon headed screws in the lock housing to release lock body. Clean old locking compound fragments out of threaded hole in piston, if re-fitting original lock unit. To fit original or replacement pressure lock unit, proceed as follows:

a Apply a drop of ‘Loctite 542’ thread lock to female

thread only in hexagon shaped piston, then fit lock body into lock housing on chamber neck ring and secure it with the two hexagon headed screws

using thread lock (part number 306033). b Attach and secure plumbing connection. c Apply a smear of silicone compound (MS4) to

shaft only of locking bolt, avoiding the thread. d Insert locking bolt into front of lock body and screw

it into piston thread until bolt head stands

1/2mm clear of cabinet front plate. Ensure that bolt

is free to move in and out easily. e Ensure locking bolt is fully engaged with the door

at its maximum extension.

Note

Do not attempt to repair a leaking or otherwise unserviceable door lock.

Page 20 of 43 ST-SM8l

SES 2000 AUTOCLAVE Part 3

PART 3 MAINTENANCE

Air Valve (Fig. 3, item 6)

3.9 The air valve is fitted in the manifold at the rear of the sterilizing chamber. To remove the air valve:

a Remove plumbing connection on reservoir side

(hold large hexagon body stationary while removing the pipe nut).

b Use the small hexagon body to unscrew valve

from manifold.

Note

Do not disturb the relationship between the large and small hexagons as this would upset the spring calibration inside the valve.

c When fitting replacement valve, use PTFE tape to

make a leakproof joint.

Note

 It is recommended that an air valve suspected of

unsatisfactory performance is renewed.

 In an emergency, or where it is known that the

valve has been subjected to sticky materials, it can be washed in a solvent such as white spirit, methylated spirit or paraffin. Ensure that the valve is dried thoroughly before refitting it.

h Fit leaf spring (4) to microswitch actuator lever (5),

with clamp screw (6) and washer (7).

i Fit striker screw (6A) and nut (8) to microswitch

actuator lever (5).

j Fit microswitch actuator lever (5) to actuator lever

(2) ensuring that the mechanism is located between limit stops (10).

k Ensure leaf spring (4) is positioned and adjusted

to keep microswitch actuator lever (5) clear of microswitch (9).

l While tightening clamp screw (6A) using thread

lock (part number 306033), twist levers (2) and (5) apart to minimise any slack between the flats on the spindle and lever.

m Set microswitch actuator lever assembly by closing

the door and revolving the door knob, to lock the door. Using a 5BA spanner, adjust striker screw (6) until the head of the screw just touches the body of the microswitch. Then undo striker screw (6) a ¼ turn and tighten locking nut.

n Open and close the door and check that

microswitch (9) operates correctly.

Door Interlock Switch (Fig. 5)

3.10 The door interlock microswitch is operated by an actuator lever. To remove and dismantle the microswitch actuator lever proceed as follows:

a Loosen clamp screw (6) and slide microswitch

actuator lever (5), complete with leaf spring (4), from actuator lever (2), and then remove nylon washer (3).

b Withdraw actuator lever (2) from the front of the

panel, and remove nylon washer (1).

c Remove clamp screw (6) and washer (7) to release

leaf spring (4). d Remove nut (8) and striker screw (6A). e Inspect, and renew all defective items. Reassemble and adjust the mechanism as follows: f Apply a smear of silicone grease (MS4) to both

sides of nylon washer (1) and position it on spindle

of actuator lever (2). g Apply a little silicone grease on spindle of actuator

lever (2) and slide the lever through the front

panel. Apply a smear of silicone grease to both

sides of nylon washer (3) and position it on spindle

of actuator lever (2)

1 Nylon washer 2 Actuator lever 3 Nylon washer 4 Leaf spring 5 Microswitch actuator lever 6A Striker screw 6 Clamp screw 7 Washer 8 Nut 9 Microswitch 10 Limit stops

Fig. 5 Door Interlock Switch

ST-SM8l Page 21 of 43

Part 3 SES 2000 AUTOCLAVE

PART 3 MAINTENANCE

Solenoid Door Lock (Fig. 4, item 22) CE ONLY see note page 38.

3.11 Maintenance procedures will depend upon whether the malfunction is mechanical (e.g. bolt or return spring sticking) or due to solenoid unit failure. Proceed as follows:

a Switch-off and disconnect mains power. b To remove locking bolt, compress the spring with

a suitable tool and open the autoclave door to provide access to the slotted bolt head screw.

c Grip the solenoid plunger, forward of the E-clip,

and insert a screwdriver in the slot of the locking bolt head to remove the locking bolt.

d Before refitting or replacing the locking bolt apply

a little ‘Loctite 542’ threadlock to the thread of the solenoid plunger.

e Refit the nylon washer in the correct position. f To remove the solenoid unit, proceed as in (b) and

(c) and detach the electrical connector from the solenoid coil, then remove the solenoid bracket fixing screws from the chamber head ring. Fit replacement solenoid unit by reversing the removal procedure.

Heater Cycling Thermostat (Fig. 4, items 2 and 3)

3.12 To remove and replace thermostat, proceed as follows:

a Switch-off and disconnect mains power. Then

detach electrical connections from thermostat noting terminals for re-connection.

b Situated inside the chamber beneath the tray

carrier is the clamp which secures thermostat sensor to the heater; carefully remove the clamp.

CAUTION

Do not kink capillary tube.

c Disconnect thermostat body from dividing panel

(2 screws), then carefully unscrew gland from rear of chamber manifold through which the capillary tube, connecting thermostat sensor to thermostat unit, passes.

d To fit replacement thermostat, reverse the

procedure described for removal. Note that it is necessary to use PTFE tape or a suitable sealing compound to make the joint between the gland and the chamber fitting.

Temperature Sensor (Fig. 4, item 4) Note: Autoclaves which incorporate a printer are fitted

with two sensors

3.13 The sensor is mounted on the manifold and retained by a fibre plate. To remove the sensor, slide

the plate out from the manifold and slide the sensors out of the plate. When removing the sensor carefully note the wire colour positions at the plug (i.e. red wire towards edge of controller board). Remove the plug from the controller board. When fitting replacement unit, coat the end of the sensor with a thin layer of zinc oxide-based heat transfer compound and ensure that no dirt or grit enters the mounting hole.

Note: When a new temperature sensor is fitted it will usually be necessary to make some small adjustments to R17, and R14 on the controller board. In addition the autoclave must be re-calibrated (see Routine Calibration Procedure).

Fill and Discharge Valves (Fig. 3, items 1 and 2)

3.14 To remove and replace the fill and discharge valves proceed as follows:

Note: When removing a fill valve, ensure that the reservoir has been drained.

a Disconnect electrical connections from valve and

release plumbing connections at each side.

b Note carefully the orientation of the valves 'fill' and

'discharge' ports to ensure correct re-connection.

c Remove pipework from valve, then remove

securing screws.

d Examine the unit. If only the valve coil has failed

(e.g. short-circuiting) it can be renewed. The valve can also be stripped and cleaned, although care must be taken to ensure no damage is caused to valve seat or rubber sealing plunger.

CAUTION

Do not lose the small internal springs in plunger.

e Fit new or refurbished valve in exactly the same

way as the original one, making connections as noted in (b).

Solid State Relay (Fig. 4 item 8) Non CE units, see note page 38.

3.15 Remove electrical connections from relay, noting their relative positions, and remove the two securing screws. When fitting a replacement relay unit, ensure that its mating face is coated with a thin layer of zinc oxide based heat transfer compound, also avoid overtightening the connector screws when reconnecting the wiring. (For CE units see 3.16)

Note

 Replacement unit should be rated at 25A, 400V

(repetitive reverse blocking voltage) or greater (i.e. it must be suitable for use on 240V rms a.c. supply).

Page 22 of 43 ST-SM8l

SES 2000 AUTOCLAVE Part 3

PART 3 MAINTENANCE

 Replace varistor across mains terminals of solid

sate relay

Solid State Relay (Fig. 4 item 8A) CE ONLY see note page 38.

3.16 Remove electrical connections from relay board noting their attachment positions. Un-fasten four screws to remove relay board from dividing panel. Un-fasten four screws from behind the board to release the solid state relay unit, together with its heat sink. Un-fasten and remove the heat sink. When fitting a replacement relay unit, coat the face which mates with the heat sink with a thin layer of zinc oxide based heat transfer compound, having first cleaned-off old compound if reusing the original heat sink. Fit heat sink to new relay unit, fit relay to board, and fit board to autoclave dividing panel by reversing the disassembly procedure. Reconnect electrical connections.

Mechanical Relay (Fig. 4 item 21) CE ONLY see note page 38.

3.17 To remove mechanical relay unit cut the plastic cable tie then unplug the relay unit from the relay board. When fitting replacement relay unit, fit a new cable tie.

Heating Element (Fig. 4 item 1)

3.18 To replace heating element, proceed as follows:

a Remove electrical connections from heating

element terminals.

CAUTION

Avoid kinking the capillary tube.

b Remove sterilizing trays and tray carrier, and

remove element clamp from inside chamber,

together with heater thermostats sensor and clip. c Unscrew and remove large nut from heater

mounting boss at rear of chamber. d Extract heating element via chamber mouth. e Fit replacement heating element by reversing

order of removal procedure.

Note

Ensure heating element is horizontal when fitted. Also ensure that a new sealing washer is used and that the nut is fully tightened, to avoid leaks.

Printer Interface Board (Fig. 4 item 20)

3.19 Remove the printer interface board as follows: a Disconnect all electrical connections noting their

position and orientation for correct reconnection. b Disconnect the voltage regulator from the partition

wall.

c Remove two screws securing the interface board

to the partition wall, and remove printer interface board complete with voltage regulator unit.

d Refit printer interface board (complete with rectifier

unit) using the reverse removal procedure but note that:

 The voltage regulator/partition wall contact

surface must be smeared with zinc oxide heat transfer compound, and the securing screw is firmly tightened.

Note: If a new printer interface board is fitted, it must be set-up as described in section 3.30.

Voltage Regulators (Fig. 8)

3.20 The voltage regulators form part of the controller board and the printer interface board and must be mounted so that they make good thermal contact with the steel partition. The leads to the voltage regulator are easily broken and if one should snap off at the body of the unit, it can be replaced by a standard 7805 voltage regulator. This avoids the need to change the entire controller. In such a case some re-adjustment of the calibration will be required.

Door Seal (Fig. 2 item 10)

3.21 Open chamber door and remove central aerotight nut, stainless steel washer, retaining plate and door seal. When fitting a new door seal, ensure the nut is tight. Check O-ring behind seal spinning and replace if necessary. Use a smear of silicone grease on the Oring.

Note: Do not allow silicone grease to come into contact with the door seal (Fig. 2 item 10).

Pressure Gauge (Fig. 3 item 3)

3.22 Ensure chamber is at atmospheric pressure and remove plumbing connection from rear of gauge. Disconnect bracket from panel by removing two nuts, spring washers and nylon spacers. Note that when fitting gauge, the spacers must be replaced between gauge and bracket. Gauge adjustment is possible by rotating the adjusting screw at the rear of the gauge, but this should only be carried out when the chamber is at working pressure (2.2 bar) on the 134°C cycle.

CAUTION When adjusting the pressure gauge, it is important that the adjustment screw should not be rotated more than a few degrees in either direction. Permanent damage to the mechanism could result if this caution is ignored.

ST-SM8l Page 23 of 43

Part 3 SES 2000 AUTOCLAVE

PART 3 MAINTENANCE

SPECIAL OPERATING MODES Demonstration Mode

3.25 Demonstration mode provides a selection of the available display messages for use at exhibitions and for customer education in whatever language has been selected. To enter this mode proceed as follows:

a Switch off power. b Push and hold the 134°C and 121°C (without

drying) programme buttons and switch on power.

c Release programme buttons when messages

start to appear:

3.26 To exit the demonstration mode, switch off power to the unit, then switch it on again.

Fig. 6 Filter Unit Disassembly

Discharge Line Filter (Fig. 3 item 10 and Fig. 6)

3.23 The filter in the discharge line should be removed and cleaned approximately every 12 months as follows:

a Ensure all water has been discharged from

chamber back into the reservoir and switch off unit.

b Remove filter assembly from discharge line,

disassemble components and rinse clean all parts, using distilled water only.

c Allow components to dry, then reassemble filter

unit. Ensure that copper washer is correctly positioned with bevel side of washer against filter body. If washer is damaged, renew it.

Printer (Fig. 2 item 22)

3.24 Remove the printer as follows: a Disconnect all electrical connections noting their

position and orientation for correct reconnection.

b Remove two screws from the printer securing

bracket. c Withdraw the printer through the front panel. d Refit the printer using the reverse removal

procedure.

Engineering Mode

CAUTION

Inbuilt protection by the controller is not

operational in Engineering Mode.

3.27 To enter the Engineering Mode proceed as follows:

a Switch off power. b Push and hold the 134°C and 121°C ‘with drying’

programme buttons (the bottom two buttons) and switch on power.

c Release programme buttons when messages

start to appear. The messages, in order are:

8.8.8.8.8. with a continuous audible signal and all programme selection LED’s illuminated, followed by ‘count’, then the accumulative number of completed cycles, then the error code (see section

3.40) for the last error stored in memory and finally ‘Engin’.

Note

In the engineering mode the display will read ‘Engin’ unless the heater is on, in which case the normal temperature display will show.

3.28 In the Engineering Mode the programme selector buttons and programme indicator LED’s function as follows:

a Button 134°C (without drying). Press to check

chamber discharge valve function. If the valve is working, the valve solenoid will be heard to click.

b Button 121°C (without drying). Press to check

water fill valve function. By opening chamber door the water can be seen to flow into the chamber.

Note

Only one of the valves can be energised at a time.

Page 24 of 43 ST-SM8l

SES 2000 AUTOCLAVE Part 3

PART 3 MAINTENANCE

c (CE ONLY see note page 38) Button 134°C (with

drying). Press to check the solenoid lock retracts.

d Button 121°C (with drying). To switch on heater,

press and hold in this button until ‘HEAt’ or (if hot) temperature display appears, then release. To switch off heater, press and hold in this button again until ‘Engin’ display appears, then release it.

CAUTION

The thermal fuse will ‘blow’ if the heater

is left switched on and the cycling

thermostat is faulty.

e Programme ‘134°C without drying’ LED will

illuminate if door switch closes.

f Programme ‘134°C with drying’ LED will illuminate

if chamber water level sensor is immersed.

Note: This condition can be simulated as follows. With

the door open and furniture removed check that LED is not illuminated. Then using a long screw driver, short the chamber level sensor to ground (the chamber wall) and check that the LED illuminates.

3.29 To exit Engineering Mode, switch off power to the

unit, then switch it on again.

Set-Up Mode

3.30 The set-up procedure will only have to be done

if the printer interface board is changed. Once started,

the procedure must be completed in full, do not switch-

off the power before it has been completed. If a mistake

is made, switch-off the power, and start again. On

autoclaves fitted with a printer, a printout showing the

main items selected within the set-up procedure will be

printed when the procedure has been completed.

Switch Identities and Functions (Fig. 7)

3.31 Throughout the set-up procedure, the following

switches are used, and they have the following identities

and functions:

 Switch 1 (SW1) Indicates ‘yes’ or ‘up’.

 Switch 2 (SW2) Indicates ‘no’ or ‘down’.

 Switch 3 (SW3) Indicates ‘accept’.

 Switch 5 (SW5) Initiates the set-up mode, and is

fitted in the top left-hand corner of the controller board.

Autoclave Front Panel

Controller Board

Fig. 7 Switch Identities and Functions

Power-On Modes

3.32 The following switches, ‘held-pressed’ when power is switched-on, will initiate their associated modes:

 Switch 5 Set-Up Mode.  Switches 3 and 4 Engineering Mode  Switches 2 and 3 Calibration Mode  Switches 1 and 2 Demonstration Mode.  Switches 1 and 4 Clock-Set Mode.

Note

When setting the clock (to change from BST to GMT for example) use the switch 1 and 4 combination, not the set-up procedure.

ST-SM8l Page 25 of 43

Part 3 SES 2000 AUTOCLAVE

PART 3 MAINTENANCE

Set-Up Procedure

3.33 After changing the printer interface board, the autoclave must be set-up as follows.

WARNING

During the following procedure, the autoclave

cover is removed, and mains voltages are

exposed

Autoclave Without Printer (Fig. 4 and 7 )

3.34 To set-up an autoclave without a printer, proceed as follows:

a Switch mains power on/off switch to ‘off’ (O). b Press and hold switch 5 and switch mains on/off

switch to ‘on’ (I). Continue holding switch 5 until

‘Set-Up’ is displayed, and then release it.

c After a short time ‘LS3’ will be displayed. d Press switch 2 to reject ‘LS3’, and check that the

display changes to ‘SES’.

e Press switch 1 and check that the display changes

to ‘Print’.

f Press switch 1 and check that the display changes

to ‘CyC-0’ (cycle counter).

g Press switch 2 and check that the display changes

to ‘Eng’ (English).

h If English is the required language press switch 1

to accept the ‘Eng’ code. If English is not the

required language, press switch 2 until the required

language code is displayed as follows:

 ‘Fre’ French.

 ‘Ger’ German

 ‘Ita’ Italian.

 ‘Spa’ Spanish.

 ‘Por’ Portuguese.

i Press switch 1 to accept the required language

code. Display changes to 'CE', press switch 1 for

CE units press switch 2 for non-CE units (see

Note page 38).

j Several bleeps will now sound indicating that the

set-up procedure is complete.

Autoclave with Printer (Fig. 2 and 7)

3.35 To set-up an autoclave with a printer, proceed as follows:

a Switch mains power on/off switch to ‘off’ (O). b Press and hold switch 5 and switch mains on/off

switch to ‘on’ (I). Continue holding switch 5 until

‘Set-Up’ is displayed, and then release it.

e Press switch 1 and check that the display changes

to ‘Print’.

f Press switch 1 and check that the display changes

to ‘CyC-0’ (cycle counter).

g Press switch 2 and check that the display changes

to ‘Eng’ (English).

h If English is the required language press switch 1

to accept the ‘Eng’ code. If English is not the required language, press switch 2 until the required language code is displayed as follows:

 ‘Fre’ French.  ‘Ger’ German  ‘Ita’ Italian.  ‘Spa’ Spanish.  ‘Por’ Portuguese.

i Press switch 1 to accept the required language

code. Display changes to 'CE', press switch 1 for CE units press switch 2 for non-CE units.

j The display will have changed to ‘od01’, indicating

that the autoclave serial number must be set as described in section 3.36 and 3.37.

k After setting the serial number note that the display

has changed to ‘Set’, and then to ‘d-t’, and then to ‘on01’ indicating that the time and date must be set as described in sections 3.38 and 3.39.

Setting the Autoclave Serial Number

3.36 The autoclave serial number (which is on the dataplate on the inside of the autoclave door, and on the back of the autoclave cover) comprises four parts:

SED 4 H 1127 D indicates the modification state 4 indicates the year of manufacture H indicates the month of manufacture 1127 is the serial number comprising two groups:

11 is the Hi group (thousands and hundreds) 27 is the Lo group (tens and units)

 The modification state (‘od01’) which is represented

by a letter from A to Z, is entered into the autoclave as a two-digit code (01 = A, to 26 = Z). Note that on the printout, the letter will be shown, not the number.

 The year of manufacture (‘yr00’), which is

represented by the last digit of the year, is entered into the autoclave as a two-digit code (00 = 1990,

to 09 = 1999). c After a short time ‘LS3’ will be displayed. d Press switch 2 to reject ‘LS3’, and check that the

display changes to ‘SES’.

Page 26 of 43 ST-SM8l

 The month of manufacture (‘on00’) which is

represented by the last two digits of the month, is

entered into the autoclave as a two-digit code (01

SES 2000 AUTOCLAVE Part 3

PART 3 MAINTENANCE

= January, to 12 = December). Note that on the printout, the month will be shown as a letter (A = January, to L = December).

 The serial number (‘hi00’ and ‘lo00’) which is

represented by four digits, is entered into the autoclave as two, two-digit groups, ‘hi’ and ‘lo’ (‘hi’ = the thousands and the hundreds) and (‘lo’ = the tens and the units). Thus, for serial number 1127, 'hi' = 11 and 'lo' = 27.

Entering the Autoclave Serial Number (Fig. 7)

3.37 Enter the autoclave serial number as follows. a Check that the display shows ‘od01’ and:

 Enter the modification state (01 = A, to 26 =

Z) by pressing switch 1 to increase the number, or switch 2 to decrease the number.

 When the number is correct, press switch 3

to accept the entry.

b Check that the display has changed to ‘yr00’ and:

 Enter the year (00 = 1990, to 09 = 1999) by

pressing switch 1 to increase the number, or switch 2 to decrease the number.

 When the number is correct, press switch 3

to accept the entry.

c Check that the display has changed to ‘on01’ and:

 Enter the month (01 = January, to 12 =

December) by pressing switch 1 to increase the number, or switch 2 to decrease the number.

 When the number is correct, press switch 3

to accept the entry.

d Check that the display has changed to ‘hi00’ and:

 Enter the first two digits of the serial number

by pressing switch 1 to increase the number, or switch 2 to decrease the number.

 When the number is correct, press switch 3

to accept the entry.

e Check that the display has changed to ‘Lo00’ and:

 Enter the last two digits of the serial number

by pressing switch 1 to increase the number, or switch 2 to decrease the number.

 When the number is correct, press switch 3

to accept the entry.

The autoclave serial number is now set. Note that the display has changed to ‘on01’ indicating that the time and the date must be entered as described in section

3.38 and 3.39.

Entering the Time and Date (Fig. 7)

3.38 The date and time comprises five elements:

 The month ‘on01’.  The year ‘yr00’.  The day ‘dy01’.  The hour ‘hr00’ ( based on the 24-hour clock).  The minutes ‘in00’.

3.39 Enter the time and date as follows. a Check that the display shows ‘on01’ and:

 Enter the month (01 = January, to 12 =

December) by pressing switch 1 to increase the number, or switch 2 to decrease the number.

 When the number is correct, press switch 3

to accept the entry.

b Check that the display shows ‘dy01’ and:

 Enter the day (01 = the first, to 31 = thirty-first)

by pressing switch 1 to increase the number, or switch 2 to decrease the number.

 When the number is correct, press switch 3

to accept the entry.

c Check that the display shows ‘yr00’ and:

 Enter the year (00 = 1990, to 99 = 1999) by

pressing switch 1 to increase the number, or switch 2 (to decrease the number).

 When the number is correct, press switch 3

to accept the entry.

d Check that the display shows ‘hr00’ and:

 Enter the hour (00 = 00.00hr, to 24 = 24.00hr)

by pressing switch 1 to increase the number, or switch 2 to decrease the number.

 When the number is correct, press switch 3

to accept the entry.

e Check that the display shows ‘in00’ and:

 Enter the minute (01 = the first minute, to 59

= the fifty-ninth minute) by pressing switch 1 to increase the number, or switch 2 to decrease the number.

 When the number is correct, press switch 3

to accept the entry.

The time and date are now set, and several bleeps will sound indicating that the set-up procedure is complete. If a printer is fitted, it will produce a printout for checking.

ST-SM8l Page 27 of 43

Part 3 SES 2000 AUTOCLAVE

PART 3 MAINTENANCE

ERRORS AND ERROR CLEARING General

3.40 Various situations can give rise to an error code being displayed. Any error is stored in the internal memory of the microcomputer. The autoclave is automatically ‘locked’ out of action until the error has been cleared. The area of error is stored for service engineering and indicated briefly by the display of one of the error codes shown below on entering the ‘Engineering’ mode (section 3.27). This will only be displayed once as entering the ‘Engineering’ mode also cancels the message.

Code Meaning

Err 1* Clock fault or Faulty temperature sensor/ channel detected

Err 2 Door open during cycle Err 3 Chamber did not fill with water (LoH2O) Err 4 Water loss early in cycle (H2O) Err 5 No heat Err 6 Control temperature low Err 7 Control temperature high Err 8* Monitor temperature low Err 9* Monitor temperature high

* Printer version only Note: These error codes are not displayed during

normal operation (see Part 2, section 2.23).

Autocheck (Printer version only)

3.43 When the sterilizing phase has been reached a check is automatically made to ensure that the temperature recorded on each sensor does not exceed specific limits for the cycle selected. Should this happen, the appropriate error code from E6 to E9 will be displayed (see section 3.40).

ROUTINE CALIBRATION PROCEDURE General

3.44 The autoclave will retain its calibration well over long periods of time but, occasionally, and when a new sensor or controller board has been fitted, re-calibration is necessary. The chamber temperature should be measured using a ‘needle’ thermocouple connected to a temperature indicator of known accuracy. In the factory a chart recorder is used. The thermocouple should be inserted through the port available in the manifold at the rear of the chamber (Fig. 4 item 19).

CAUTION Take care not to damage the internal seals in the test port fitting. Avoid using a sharp pointed thermocouple probe, if possible.

3.45 It is recommended that the calibration is checked at least every twelve months, or more often if the unit is heavily used or if local codes of practice require it.

3.46 For the purpose of this description it will be assumed that the autoclave is working correctly and that a routine temperature calibration is required.

3.41 Once the fault has been corrected, clear the error from the microcomputer memory as follows:

a Switch off power to the unit. b Push and hold in any one of the programme

selector buttons (not switch 5) and switch on power.

c Release programme selector button after two

seconds.

Control Sensor Selection (Printer version only)

3.42 At any time during normal operation of the autoclave, when the heater is operating and the temperature display is showing, pressing switch 5 will ‘switch’ the display to the control sensor and ‘c’ will be displayed in the far left position for as long as the button is pressed. This feature enables a check to be made on the control temperature in relation to the display temperature.

Page 28 of 43 ST-SM8l

3.47 It is particularly important that the following points are noted before calibration is attempted:

a There must be no steam leaks. b The air valve must close between 99 and 104°C. c The machine should have been run sufficiently to

become thoroughly warm.

Note 1

A machine with suspect calibration should only be run using the calibration sequence described below. This should avoid the possibility of the safety valve lifting due to excess chamber pressure, which might be the case if the 134°C programme were to be selected.

Note 2

To ensure accurate calibration the cover should be replaced (not fixed) whenever possible during stages

3.48 'b to e'.

SES 2000 AUTOCLAVE Part 3

PART 3 MAINTENANCE

Calibration Procedure (Fig. 8)

3.48 The autoclave control programme contains a special calibration sequence to ensure accurate calibration in the shortest possible time. Do not set-up the sterilizer by carrying out normal sterilizing cycles; it is important to proceed methodically as follows:

a With the unit cover removed, insert needle

thermocouple probe from a calibrated chart recorder into the manifold test port (Fig. 4, item 19) at the rear of the chamber. Ensure that the chart recorder has thoroughly ‘warmed up’.

b Switch off the autoclave. Ensure the water reservoir

is full and, for safety reasons, ensure that the reservoir is then properly covered. Ideally, a test load should be placed in the chamber; but this is not essential. With power switched off, press and hold the two centre buttons on the front panel (121°C without drying and 134°C with drying). Holding-in these two buttons, switch on power. The display ‘CALIB’ will appear, the solenoid door lock will engage (CE ONLY, see note page 38) ‘FILL’ will be displayed for approximately 150 seconds followed by ‘HEAt’ as the heater is switched on. The unit will heat to the temperature reached during the 121°C cycle.

c When the temperature has been achieved and the

machine has been in the sterilizing mode for 5 to 6 minutes calibrate to between 121°C and 124°C on the chart recorder. Carefully adjust R 17 on the controller board (clockwise to increase) until this temperature is achieved. Adjust the control a little at a time and observe the effect after each adjustment. Once this setting is correct the display should read values similar to those shown on the chart recorder.

Note 1

If the chart trace ‘sawtooth’ effect is excessive switch off the sterilizer, wait for 10 seconds and switch on to allow the chamber contents to discharge back to the reservoir, then check the seating of the temperature sensor. It should be in good thermal contact with the flat bottom of the ‘well’ formed in the outlet manifold at the rear of the chamber. A small amount of zinc oxide-based heat transfer compound should be smeared on the surface of the sensor. If it has been necessary to make readjustments to the temperature sensor, switch off power then re-start the calibration cycle as described in para. (b).

Note 2

The next adjustment will have to be completed within approximately three minutes, before two ‘bleeps’ are heard indicating completion of the 134°C cycle. At this point temperature will fall to

122.5°C. Note, however, that it is possible to repeat the 134°C cycle at any time by pressing the ‘134°C without drying’ programme button again.

d Push the 134°C button on the front panel. After a

short time an audible signal should be heard. Release the button. The sterilizer will now perform a 134°C cycle from the baseline of 122.5°C. the sterilizing temperature has been reached and the chart recorder trace has levelled-off, adjust R14 on the controller board (clockwise to decrease) carefully until the recorder trace indicates between 134°C and 138°C.

e Repeat (c) and (d) to ensure consistent calibration

is achieved.

f Once calibration is complete, switch off the unit,

wait for 10 seconds then switch it on. The discharge valve will now open and exhaust steam and condensate back into the reservoir. After this has happened, switch off and seal the adjustment positions of potentiometers R17 and R14 on the controller board (e.g. with nail varnish).

Note 1

Issue 7 of pcb (top left-hand corner). Turn R1 (instead of R17) counter-clockwise to increase temperature, and turn R2 (instead of Rl4) clockwise to increase temperature. Issue 8 March 1991. Revert to original instructions.

Note 2

Running calibration cycles will not advance the cycle counter. Some of the error detection systems are automatically ‘switched off’ during the calibration phase.

g A label should be fixed to the autoclave indicating

the date on which it was calibrated, the technician responsible and the date when it should next be calibrated. The recorder charts should be kept. The temperature sensing systems used in the autoclave have been shown to be reliable and relatively drift-free over long periods. Nevertheless it is recommended that the calibration be checked at least every 12 months, or more often if the sterilizer is heavily used.

Once

ST-SM8l Page 29 of 43

Part 3 SES 2000 AUTOCLAVE

PART 3 MAINTENANCE

Safety Valve (Fig. 3 item 5 and Fig. 7)

3.49 Test the safety valve as follows:

CAUTION

Ensure reservoir access cover is fitted

Fig. 2 (item 16)

Note

To cancel the safety valve test, switch-off the on/off switch for 4 seconds, then switch it on again. This will vent all pressure and water to the reservoir.

a Refer to Routine Calibration Procedure and carry

out the instructions in section 3.48 and run the autoclave up to 134°C.

b When 134°C is reached, switch-off power at the

power on/off switch. c Enter the ‘Engineering Mode’ (see section 3.27). d Switch-on the heater by pressing and holding-in

switch 4 (Fig. 7). e With the heater switched-on, the temperature will

rise without control from the controller. The safety

valve should start to vent at approximately 138.5°C

(read from the chart recorder). The temperature

and pressure should increase until the safety

valve operates and maintains pressure below a

maximum of 2.9bar (42 p.s.i.) at 142.5°C.

Controller Board with Daughter Board

Operational Test

3.50 The safety valve should be checked every 12 months for correct function and test of set pressure, full flow and reseat pressures. Particular care should be taken with the use of sealing compounds and PTFE tape to ensure that they do not enter the valve.

3.51 It is recommended that adjustments, maintenance and repair of safety valves should only be carried out by Eschmann personnel or accredited agents. Removal and installation of the valve is a straightforward procedure, but on installation, wrap the valve threaded pipe fitting.

PTFE tape around

Controller Board without Daughter Board

Fig. 8 Autoclave Controller Boards

Page 30 of 43 ST-SM8l

SES 2000 AUTOCLAVE Part 4

PART 4 ILLUSTRATED PARTS LIST

IMPORTANT NOTE: From SN prefix SCC (std.) and LSCC (long) the pipes and

fittings have been changed to those shown in the Schematic Diagram below

(i.e. pipes changed from copper to reinforced silicone).

490157* Reservoir

490188* Reservoir

RESERVOIR

coil assy.

vent pipe assy.

CONDENSOR

Drain hose 115459

115463 (for long)

Fill pipe 115460 (for Short)

CLAMP

(380010)

115462 (for Long)

Air vent pipe 115458 (for Short)

Fit a swivel fitting (424289) where indicated

Tube assy.

115437 (for Long)

115466 (for Short)

Restrictor 115285

inside pipe here.

VALVE

RELIEF

PRESSURE

AIR

VENT

FILL VALVE

ASSY. 490173

Discharge pipe 115337

490125

DISCHARGE

VALVE ASSY.

115461 (for Long)

Pipe 115237 (for Short)

MANIFOLD ASSY. 490158

FILTER ASSY. 490126

490185* Fill valve

to filter, pipe assy.

(696656)

20 mm Grommet

assy. & nut 301156

427072* Water fill pipe

TEST

PRESSURE DOOR

LOCK ASSY. 427035

& swivel fitting 112780)

PRESSURE GAUGE ASSY.

490159 (includes elbow 115457

(301842)

25 mm Grommet

PORTS

TEST

PLUG

CHAMBER

Apply a cable tie (695777) to all silicone pipe connections using Tool No. 2157 on setting 2.

* These copper pipe assemblies come complete with the required olive(s) and nut(s).

ST-SM8l Page 31 of 43

Part 4 SES 2000 AUTOCLAVE

PART 4 ILLUSTRATED PARTS LIST 1: PIPES AND VALVES

For units with silicone (i.e. not copper) pipes see page 31.

Illustration of tap

now supplied

Fig. 9 Pipes and Valves

Fig. 9 Part No Description Qty.Per Recommended Holding Item No Standard Long Unit Per Unit, Per Year

Pressure chamber assy. 1 1 490090** 490117** . Chamber 1 Not available for purchase 2 490191# . Waterfill pipe assy. 1 3 490268 . Manifold, assy., including 1 -

- 380082 . . 'T' piece 1 -

- 380020 . . ¼" Plug 1 -

- 391132 . . ¼" Washer 1 -

- 490258 . . Manifold 1 -

- 301349 . . Test plug (no longer fitted) 1 -

- 301739 . . Safety valve 1 1

- 301625 . . Coupling 1 -

- 425176 . . Air valve (see below for 110Volt) 1 -

- 110064 . . Air valve (110Volt models only) 1 4 490173 Valve, solenoid (water fill) assy. 1 1 5 490048 Valve, solenoid (discharge) assy. 1 1 6 490195 Filter assy. 1 1 6A* 380036 . Washer, copper 1 1 7 427035 Pressure lock assy. 1 8 427060 . Bolt, locking 1 9 490010 Pressure gauge 1 10 380010 Tap 1 1 11 490157 Coil 1 -

* Not illustrated ** see 'Chamber changes notes' on page 33 # was 490252 pre SN SED3I1798 for Standard and 490220 pre SN LSEB3I0045 for Long.

Page 32 of 43 ST-SM8l

SES 2000 AUTOCLAVE Part 4

Chamber changes on current models:

To ensure easy access into the chamber to meet the requirements of PSSR2000, the following parts have been fitted. This enables temperature and pressure measurement at this point.

Standard Chamber

The Chamber (part number 490040) has been fitted with the following new parts at the top rear port:

427030 1 ¼" BSP chamber fitting 490037 1 Blank chamber fitting 490031 2 Chamber nut 427041 2 Copper washer 380082 1 Tee 301349 1 Twinlock 380020 1 ¼" BSP Plug 391132 1 ¼" BSP Dowty washer

Long chamber

The Chamber (part number 490117) has been fitted with the following new parts at the top rear port:

427030 1 ¼" BSP chamber fitting 380082 1 Tee 301349 1 Twinlock 380020 1 ¼" BSP Plug 391132 1 ¼" BSP Dowty washer

8 watt solenoid valve spares

The latest (from early 2007) solenoid valve tubes fitted to these machines do not have an angle for sealing to the brass manifold, they rely on the 'O' ring to seal. The basic valve is part number 301906, the spare valve parts are illustrated and detailed below:

Description Part No.

Tube 110765 Armature 110764 Valve seal 111536 'O' ring 115454

Armature TubeSeal

'O' ring

Nut and washers

End of armature shown with and without the seal in place.

ST-SM8l Page 33 of 43

Part 4 SES 2000 AUTOCLAVE

PART 4 ILLUSTRATED PARTS LIST 2: GENERAL SPARES

Fig. 10 General Spares

Page 34 of 43 ST-SM8l

SES 2000 AUTOCLAVE Part 4

PART 4 ILLUSTRATED PARTS LIST 2: GENERAL SPARES

Fig. 10 Part No Description Qty.Per Recommended Holding Item No Standard Long Unit Per Unit Per Year

1 490290 490142 Chassis 1 2 490310 490144 Top cover 1 3 111928 Screw, self tapping 4 4 4 490063 490146 Dividing panel 1 5 490283 Front panel (without printer) 1 Not available for purchase 6 490282 Front panel (with printer) 1 7 - Pressure chamber assy. (See Parts List 1) 8 490228 490178 Carrier assembly, tray 1 9 - Tray (REF 87-040-07) 4 10 490046 Reservoir (requires kit 112472) 1 * 425170 . Surface tension breaker * 425062 . Reservoir lid rectangular (without switch hole) 11 475872 . Reservoir aperture cover (round) 1 12 425146 Ring, grey rubber 1 1 * 425165 . Ring, adhesive - 13 425141 Ring seal, silicone 1 1 14 480301 Foot, c/w fixing screw 4 * 380045 Spacer, foot 2 15 490302 490304 Door cover assy. 1 16 - Door assy. 1 17 480315 . Door beam assy. 1 18 490076 . Door knob 1 19 427011 . Door secondary latch 1 20* 427023 . Spring, secondary latch 1 21 490017## . Door, pressure assy. 1 22 424238## . Seal, retaining rim 1 23 427037 . Door seal (gasket) 1 1 24 427015 . Retaining disc, seal 1 25 427090 . Seal washer, steel 1 1 26 713651## . O-ring (on older models) 1 1 27# 307232# . Aerotight nut# 1 1 28 427010 Safety catch, door 1 29* - Tray lifter (REF 87-040-90) 1 30* 301409 Drip tray 1 31* 425188 Accessory pack containing 1 -

4 off each, cups and spacers for

cabinet feet 32* REF 87-040-66 Pouch rack accessory A/R 33 490291 Printer assembly 1 34 490397 S.S.R.B.Insulation 1 35 424395 Fuse cover 1 36 424396 Water shield, control board 1 37 427007 Door spindle assembly 1 38 427008 Link 1 * 380034 Cable saddles A/R * 380033 Self mount cable ties A/R * 301600 P.T.F.E.Tape A/R * 306234 Hydraulic sealant A/R -

* Not illustrated # Now replaced by M6 Nut (710372) and M6 Spring washer (710721)

## For units with an 'O' ring (before c.1999) replace parts 21, 22 and 26 with parts 21 and 22 only (latest design of these parts eliminates need for 'O' ring).

ST-SM8l Page 35 of 43

Part 4 SES 2000 AUTOCLAVE

PART 4 ILLUSTRATED PARTS LIST 3: HEATER AND PROCESS CONTROLS

Note: Items 9 and 9a are

fitted to the underside of chamber manifold but shown here for clarity.

Fig. 11 Heater and Process Controls

Page 36 of 43 ST-SM8l

SES 2000 AUTOCLAVE Part 4

PART 4 ILLUSTRATED PARTS LIST 3: HEATER AND PROCESS CONTROLS

Fig. 11 Part No Description Qty.Per Recommended Holding Item No Standard Long Unit Per Unit Per Year

1 412012 Heating element 230V, 2kW - -

416220 Heating element 230V, 2.75kW - -

412008 Heating element 110V, 1.4kW - -

2 425114 Thermal fuse assy. 10A 1 1

(220V/240V units)

380081 Thermal fuse assy. 20A 1 1

(110V units)

380081 Thermal fuse assy. 20A 1 1 3 301162 Microswitch 1 1 4* 427021 Stop pin, microswitch 2 5 480314 Sensor, water level assy. 1 * 301806 . Shouldered washer 1 1 * 301807 . Silicone bush 1 1 * 425124 . Insulation bush 1 1 * 425121 . Water level body 1 1 6 380026 Thermostat assy. 1 7* 416149 Clamp, thermostat sensor bulb 1 8 427020 Actuator arm, microswitch 1 9 490260 Sensor, temperature, assy. 1 1

490260 Sensor, temperature, assy. 2 2

(for units with printer) 9A 490262 Plate, retaining sensor 1 10 301127 Lamp, neon, red (overheat) 1 11 380000 Power switch, on/off 1 12 490335 490338 Controller board assy. 1 * 490336 . Daughter board 1 * 301797 . Fuse F2A, 20 mm 1 1

* Not illustrated

Continued

ST-SM8l Page 37 of 43

Part 4 SES 2000 AUTOCLAVE

PART 4 ILLUSTRATED PARTS LIST 3: HEATER AND PROCESS CONTROLS

Fig. 11 Part No Description Qty.per Recommended Holding Item No Standard Long Unit Per Unit Per Year

13 110249 Transformer with shroud 1 * 110250 . Transformer shroud 1 14 301478 Solid state relay (not for CE Units**) 1 14A 301481 Relay control board 1 15* 696952 Varistor assy. 1 16 380012 Terminal block 1 17 380001 301890 Fuse holder, large 2 18 301814 Fuse holder, small 1 19* - Fuse: 2 2

Standard Long * 380003 301871 F10A 230/ 240V F15A 240V 2 1 * 380002 301871 F13A 220V F15A 220V 2 1 * 111940 F16A 110V 1 1 20* Fuse: 1 1 * 696181 F400mA 220/230/240V 1 1 * 380004 F800mA 110V 1 1 21 490080 Cable, power supply, assy. UK# 1 -

(inc. fused plug) (230V) 22 710894 Clamp, cable 1 23 710897 Nut, cable clamp 1 24* 427022 Leafspring, microswitch actuator arm1 25 427104 Lever assy. microswitch 1 1 26* 427020 Actuator arm, microswitch 1 27 490337 Printer interface board 1 29 490025 (CE ONLY**) Solenoid door lock 1 30 427060 (CE ONLY**) Locking bolt 1 31* 380072 (CE ONLY**) Ferrite clamp 3 1

mains loom

32* 380073 (CE Printer version ONLY**) 1 1

Printer ribbon

33* 490342 (CE ONLY**) E.M.I. Shield 1 -

* Not illustrated ** See note below

# For other countries consult manufacturer.

IMPORTANT NOTE: From late 2008 all non-CE units are built as CE units (i.e. all units will be built to the CE format). Comments qualified by 'non-CE units only' no longer apply and 'CE only' will apply to all units.

Page 38 of 43 ST-SM8l

SES 2000 AUTOCLAVE

APPENDIX A - OPERATING INSTRUCTIONS FOR PRINTER

Printer Output

The printer output gives the following information:

♦ Manufacturer’s name Eschmann Equipment ♦ Machine type SES 2000 ♦ Serial number Nine character code ♦ Cycle type e.g. 134°C no drying ♦ Time and date started At hh:mm:ss

On dd:mm:yy

♦ Counter reading Five digits with leading

zeros

♦ Time/temp information Time every 22 secs

(approx.) + temp. + graph of temperature.

♦ Cycle ended message ♦ Time and date ended The ‘cycle end’ is

defined as the end of the sterilizing phase.

If an error occurs during the cycle, it is recorded with date and time on the printout and the message ‘CYCLE FAILED’. Errors are designated by error codes as follows:

ERR1 - Faulty temperature sensor/channel

detected ERR2 - Door open during cycle ERR3 - Chamber did not fill with water (LoH2O) ERR4 - Water loss early in cycle (H2O) ERR5 - No heat ERR6 - Control temperature low ERR7 - Control temperature high ERR8 - Monitor temperature low ERR9 - Monitor temperature high

These error codes will generally require investigation by an Eschmann trained engineer.

Front Panel Controls (Fig. A1)

All controls for the printer are on the front of the panel. a. Door Latch Button - To open door (1) push the

door latch (2) sideways, in the direction of arrow, and pull the door open to expose paper roll (4).

b. Paper Feed Button - Ensure the sterilizer mains

‘on/off switch is in the ‘I’ (on) position. Press lower part of paper feed button (3) to activate paper feed, which will continue for as long as the button is depressed.

Paper Roll Renewal

CAUTION:

DO NOT USE ALTERNATIVE PAPER ROLLS

The quality and size of paper rolls used in the printer,

can only be supplied by Eschmann Equipment.

Appendix A

Renew paper roll as follows (Fig. A1 and A2):

a. Open autoclave chamber door to provide more

access.

b. Push door latch button (2) sideways, in direction of

arrow and pull door open to expose paper roll (4).

c. If any paper remains in the printer, tear end off

against paper tear bar (8) and carefully withdraw the remaining paper backwards from the rear of printer mechanism (5).

d. Compress paper roll spring-loaded retainer

button (6) and withdraw empty paper spool from spindle.

e. Take new roll of paper, separate paper end

from the roll. Remove any damaged or gummed part of the paper.

f. Compress paper roll spring-loaded retainer

button (6) and locate new paper roll on spindle with paper unreeling counter-clockwise as seen from open end of spindle (Fig. A1).

g. Using scissors, trim end of paper roll at an

angle of approximately 30° (Fig. A4) and insert this end of the paper into the paper insert slot (1). Press paper feed actuator arm (7) until mechanism grips paper and pulls it through to

front of printer door. h. Turn paper roll by hand to take up any slack paper i. Close the printer door. Check paper feed by

pressing paper feed button (3) until the end of the

trimmed paper is clear of the tear bar. Ensure that

the paper feeds freely from the printer.

Ribbon Cartridge Renewal (Fig. A3 and A4)

Renew ribbon cartridge as follows: a. Remove paper roll.

b. Support door with left hand and press upwards with

right hand on bottom of printer mechanism chassis

(Fig. A2-2) and separate chassis from door.

CAUTION:

Do not pull printer mechanism chassis from

door until catch has been released.

c. Leaving printer door fully open, expose printer

mechanism and ribbon cartridge (Fig. A4-1). d. Pinch the end of ribbon cartridge marked ‘PUSH’

(Fig. A4-1) and remove cartridge. e. Install new cartridge, checking that left hand side

of cartridge is correctly located on drive shaft,

and CAREFULLY press cartridge into place. f. Ensure ribbon is taut. If necessary tighten

ribbon by turning faceted disc (Fig. A2-2) on

cartridge, clockwise, using finger or fingernail. g. Fit paper roll as described above.

ST-SM8l

Page 39 of 43

Appendix A SES 2000 AUTOCLAVE

Spares Pack

A spares pack is available comprising:

♦Five paper rolls ♦Two ribbon cartridges

The spares pack is available from Eschmann Equipment please quote REF 87-034-05.

Setting Date and Time (Fig. A5)

1. To change the clock setting (e.g. from GMT to BST or the reverse) proceed as follows:

a. Select mains ‘on/off switch to ‘0’ (off). b. Push and hold switch 1 and switch 4 simultaneously

then select ‘on/off’ switch to ‘I’ (on). c. The display will read ‘01’. d. Then proceed as described in paragraph 2 (a) to (g).

2. To set the date and time proceed as follows: a. If closed, open chamber door. b. Display reads ‘01’. Push and hold switch 1. Observe

that number changes to 02,03 etc. through to 12.

Also note that pushing and holding switch 2

makes the number decrease. Use switch 1 and

switch 2 to set the number corresponding to the

month (01=January etc.). Push switch 3 to retain

selection. c. Display reads ‘dy01’. Again use switch 1 and

switch 2 to display the day of the month (push

switch 3 to retain the day). Note: The computer

will prevent entry of dates such as 31st Nov. d. Display reads ‘yr00’. Use switch 1 and switch 2

to set any year from 00 to 99 (e.g. 97=1997).

Then push switch 3 to retain it. e. Display reads ‘hr00’. Use switch 1 and switch

2 to set the hour - the system utilises a 24 hour

clock. Then push switch 3 to retain it. f. Display reads ‘in00’ (minutes). Use switch 1

and switch 2 to show current minutes and push

switch 3 to retain it. g. The clock is now set.

1. Paper Insert Slot

2. Printer Mechanism Chassis

Fig. A2. Paper Feed

Fig. A3. Ribbon Cartridge

Fig. A1. Printer

1. Ribbon Cartridge

2. Faceted Disc

Fig. A4. Ribbon Cartridge in Position

switch 1

1. Printer Door

2. Door Latch

3. Paper Feed Button

4. Paper Roll

Page 40 of 43 ST-SM8l

5. Printer Mechanism

6. Spring-Loaded Retainer Button

7. Paper Feed Actuator Arm

8. Paper Tear Bar

Programmes without drying

Programmes with drying

{ {

Fig. A5. Setting Date and time

134°C

switch 2

121°C

switch 3

134°C

switch 4

121°C

SES 2000 AUTOCLAVE Appendix B

APPENDIX B - Schematic diagram - Pipework and valves

RESERVOIR

CONDENSOR

AIR VENT PIPE

ONLY

VALVE LS3

PIPE

DISCHARGE

VALVE

RELIEF

PRESSURE

PIPE

FILL

NON-RETURN

VALVE

DISCHARGE

HOSE

DRAIN

FILL

VALVE

TA P

GAUZE FILTER

AIR

VENT

MANIFOLD

FILTER BLOCK

GAUGE

PRESSURE

TEST

PORTS

TEST

PRESSURE

DOOR LOCK

PLUG

CHAMBER

STANDPIPE CONNECTION

FOR FILL AND DISCHARGE

DOOR

ST-SM8l Page 41 of 43

Eschmann Equipment, Peter Road, Lancing, West Sussex, BN15 8TJ, England.

Tel: +44 (0) 1903 753322. Fax: +44 (0) 1903 875789. www.eschmann.co.uk

Appendix C SES 2000 AUTOCLAVE

APPENDIX C - Schematic diagram - CE version (see note page 38)

Options chart

Temperature sensor Temperature sensor

Daughter PCA

J6 Display J5 Control

490335

Voltage

rating

R1F3F2

Overheat

neon

Heater

Transformer tappings

Relay board 301481

S.S.Relay

Varistor

241 3

230V

F400mA

F10AF10A

F400mA

F15AF15A

100K

230V

STD 2kW

LONG

2.75kW

OE/BK

Link BN

Heater

T1 T2 T3 T5 T6 T7T4

Cycling thermostat

Fill valve

Variable capacitor

PL2-10

PL2-9 PL2-8 PL2-7 PL2-6

PL2-5 PL2-4 PL2-3 PL2-2 PL2-1

PL1-10

PL1-9 PL1-8 PL1-7 PL1-6

PL1-5 PL1-4 PL1-3 PL1-2 PL1-1

Chamber sensor

Door switch

Discharge

valve

Solenoid

door lock

Wire colours

Abbreviation Colour

BK BN RD OE YW GN

GN/YW

BE ME GY WE

RD/BK

Black

Brown

Red

Orange

Yellow Green

Green/Yellow

Blue

Mauve

Grey

White

Pink

Red/Black

Printer

(Optional)

10 pin

ribbon cable

Printer Power PCA

GN/YW

Central earth point

Thermal

fuse

Mains on/off

Mains input

16 pin

ribbon cable

490337

(Optional)

Mains

transformer

ST-SM8l Page 42 of 43

Appendix C SES 2000 AUTOCLAVE

APPENDIX C - Schematic diagram - non-CE version (see note page 38)

Options chart

Temperature sensor Temperature sensor

Daughter PCA

J6 Display J5 Control

490335

R1F3F2

100K

Overheat

neon

230V

Heater

STD 2kW

LONG

2.75kW

OE/BK

Transformer tappings

Link BN

S.S.Relay

Varistor

Voltage

rating

230V

F400mA

F10AF10A

F400mA

F15AF15A

Heater

Cycling thermostat

Fill valve

Variable capacitor

PL2-10

PL2-9 PL2-8 PL2-7 PL2-6

PL2-5 PL2-4 PL2-3 PL2-2 PL2-1

PL1-10

PL1-9 PL1-8 PL1-7 PL1-6

PL1-5 PL1-4 PL1-3 PL1-2 PL1-1

Chamber sensor

Door switch

Discharge

valve

Wire colours

Abbreviation Colour

BK BN RD OE YW GN

GN/YW

BE ME GY WE

RD/BK

Black

Brown

Red

Orange

Yellow Green

Green/Yellow

Blue

Mauve

Grey

White

Pink

Red/Black

Printer

10 pin

ribbon cable

Printer Power PCA

GN/YW

Central earth point

Thermal

fuse

Mains on/off

Mains input

(Optional)

16 pin

ribbon cable

490337

(Optional)

Mains

transformer

Page 43 of 43 ST-SM8l

Eschmann SES2000 Service Manual

Specifications and Main Features

Frequently Asked Questions

User Manual