eschmann SES2000 User manual

SES2000
A UT O CLAVE
Service Manual
ST-SM8l
699215

Service Manual
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: [phone]. Fax: [phone].
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
Copyright © 2008 Eschmann Holdings Limited
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.
The CE marking affixed to the product certifies that it complies with the
European Medical Devices Directive 93/42/EEC and related legislation.
ST-SM8l November 2008

ST-SM8l Page 3 of 43
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

Page 4 of 43 ST-SM8l
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)
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
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
Caution refer to accompanying
documents
Sterilising cycle without drying phase
(NB. temperature = cycle temperature)
Sterilising cycle with drying phase
(NB. temperature = cycle temperature)

ST-SM8l Page 5 of 43
SES 2000 AUTOCLAVE
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.
Nominal Operating pressures:
134°C cycle - 3.14 bar abs
121°C cycle - 2.11 bar abs
Water reservoir
capacity 2.0 litres
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
Sterilising cycle without drying phase
(NB.temperature = cycle temperature)
Sterilising cycle with drying phase
(NB.temperature = cycle temperature)
TECHNICAL DATA
(Long Version)

Page 6 of 43 ST-SM8l
SES 2000 AUTOCLAVE
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.
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).
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.
PART 1 INTRODUCTION
Fig. 1 SES 2000 Autoclave
Part 1

SES 2000 AUTOCLAVE Part 2
ST-SM8l Page 7 of 43
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
protectivethermalfuse(Fig.4item7)hasoperated.
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.
DoorSecondaryLatch(Fig.2item6).Thisengages
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/in2). 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
controllerasnecessaryandisthemeansofcontrolling
the heater output. The solid state relay is fitted on the
protectionrelayprintedcircuitboardwhichismounted
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

Part 2 SES 2000 AUTOCLAVE
Page 8 of 43 ST-SM8l
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-filledcapsule clamped tothe heating element
which will cause the thermostat cut-out device to
operateiftheheater surface temperatureexceeds
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
overheatingconditionshouldoccur.Notehowever
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
twolargerfusesareconnectedintothe‘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’whenfittingareplacement transformer.
Water Fill Valve (Fig. 3 item 1). This valve is used
to control the water fill sequence. It is electrically
operatedfroma24Vd.c.supplywhichisgenerated
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.
Theboard interfaces the printer with theintegrated
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 microprocessor-
based controller. The controller handles every
aspect of management of the machine which
includesoperationandcontrolofthedigitaldisplay,
the light emitting diodes and response to the
programmeselection 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.

SES 2000 AUTOCLAVE Part 2
ST-SM8l Page 9 of 43
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
ordertocontinuewiththe cycle the doormustbeopened,
at which point the display will change to ‘ready’ (or time)
and the four green indicators will come on.
2.9 Aftertheworktrayshave beenputinthechamber
and the door closed, a programme can be selected and
initiated by pressing one of the programme selector
buttons. Iftheautoclavehasaprinteritwillautomatically
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
temperaturesensor.Timingiscontrolledbythecontroller
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.

Part 2 SES 2000 AUTOCLAVE
Page 10 of 43 ST-SM8l
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
signaloveratwosecondperiodtoindicatethebeginning
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

SES 2000 AUTOCLAVE Part 2
ST-SM8l Page 11 of 43
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 Waterlevelinchamberhasdropped
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 Ifan 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
occursduringasterilizationcycle,theprinterwillprintout
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'.

Part 2 SES 2000 AUTOCLAVE
Page 12 of 43 ST-SM8l
PART 2 DESCRIPTION
Fig. 2 Autoclave General Arrangement
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)
19 Unit cover
20 Front panel
21 Chassis
22 Printer
23 Link
# Now replaced by nut and spring washer, see Parts List 2, item 27.

SES 2000 AUTOCLAVE Part 2
ST-SM8l Page 13 of 43
PART 2 DESCRIPTION
Fig. 3 Autoclave: Pipes and Valves
7 Pressure door lock
8 Reservoir drain tube
9 Drain tap
10 Filter unit
11 Coil
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.
Push to open Press to close
Current drain tap. Note
correct orientation and
location on drain tube.

Part 2 SES 2000 AUTOCLAVE
Page 14 of 43 ST-SM8l
PART 2 DESCRIPTION
Fig. 4 Autoclave: Heater and Process Controls
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
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)
Note: Items 4 and 4a are
fitted to the underside of
chamber manifold but
shown here for clarity.

SES 2000 AUTOCLAVE Part 3
ST-SM8l Page 15 of 43
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
5.
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

Part 3 SES 2000 AUTOCLAVE
Page 16 of 43 ST-SM8l
PART 3 MAINTENANCE
Fault Possible Cause Remedy
(b) Pressure in chamber. (b) Switch-on power to release
pressure in chamber.
(c) Vacuum in chamber. (c) As (b) to open door then
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.
(c) Air valve stuck in (c) Replace air valve (section 3.9)
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
(c) Door switch out of (c) Adjust switch lever position,
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

SES 2000 AUTOCLAVE Part 3
ST-SM8l Page 17 of 43
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)
(c) Discharge valve leaking (c) Strip and clean discharge
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
(c) Discharge valve (c) As for Fault (7) (c).
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

Part 3 SES 2000 AUTOCLAVE
Page 18 of 43 ST-SM8l
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.
(c) Slow discharge at end (c) See Fault (10) (c) and (e)
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

SES 2000 AUTOCLAVE Part 3
ST-SM8l Page 19 of 43
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
(c) Failure of component (c) Change solid state relay
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
(c) If gauge reads low - (c) Check temperature with
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

Part 3 SES 2000 AUTOCLAVE
Page 20 of 43 ST-SM8l
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
blockand 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.
Unhookoneendofmountingspringandremovethermal
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
disconnectthem.Removetheboltsecuringthecontroller
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.