Eschmann SES2000VAC Service Manual
SES2000 VAC(LS3)
VACUUM AUTOCLAVE
Service Manual
1 10258
ST-SM45g
Introduction
Description
Maintenance
Illustrated
Parts list
Read these Instructions before use
Keep this ‘Service Manual’ in a safe convenient place for future reference. Read in
conjunction with the Publication detailed in Part 1.
This Service Manual applies to the following Autoclaves:-
Note: The ‘E’ in the serial number below is the ‘modification state’ of the autoclave and is used
within this manual to identify availability of spare parts where some items on early models are
no longer available.
SES 2000 V ac (LS3) - Standard, from Serial Number SVE1A0000
without printer - REF 87-050-06
with printer - REF 87-050-14
SES 2000 V ac (LS3) - Long, from Serial Number SLVE1A0000
without printer - REF 87-050-22
with printer - REF 87-050-30
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 enquiries, please quote the
Model and Serial Number of your Autoclave which is shown on the Serial Number plate, the
location of which is shown below. Please ensure you include all alpha and numeric digits of the
Serial Number.
Serial Number
Plate
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.
T el: +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 logo is a registered trade mark of Eschmann Holdings Ltd.
“SES200” is a trade mark of Eschmann Holdings Ltd.
Patents : Patents Pending plus - Pat. US5090033 and Pat. GB2238407
Copyright © 2004 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.
Service manual
ST-SM45g January 2005
SES 2000 Vac (LS3) AUTOCLAVE
CONTENTS
Page
Contents .. .. .. .. .. .. .. .. 3
T echnical data .. .. .. .. .. .. .. 4
PART 1 INTRODUCTION
General .. .. .. .. .. .. .. .. 6
Associated publications .. .. .. .. .. 6
Servicing .. .. .. .. .. .. .. .. 6
PART 2 DESCRIPTION
General .. .. .. .. .. .. .. .. 7
Operating features .. .. .. .. .. .. 7
Operation cycle .. .. .. .. .. .. .. 9
Display messages .. .. .. .. .. .. 1 1
Error indication .. .. .. .. .. .. .. 11
General.. .. .. .. .. .. .. .. 11
Overheating .. .. .. .. .. .. .. 12
PART 3 MAINTENANCE
Fuses .. .. .. .. .. .. .. .. 17
Fault diagnosis .. .. .. .. .. .. .. 17
Parts replacement and adjustment .. .. .. 23
Autoclave cover .. .. .. .. .. .. 23
Reservoir assembly .. .. .. .. .. 23
Transformer .. .. .. .. .. .. .. 23
Control board .. .. .. .. .. .. 24
Pressure door lock .. .. .. .. .. 24
Steam bleed solenoid valve .. .. .. .. 24
Door interlock microswitch .. .. .. .. 24
Solenoid door lock.. .. .. .. .. .. 25
T emperature sensors .. .. .. .. .. 25
Solenoid valves
V acuum, steam bleed, water discharge .. 25
Air-Inlet Solenoid Valve Assembly .. .. 25
Water-Fill Solenoid Valve Assembly .. .. 26
Heating element .. .. .. .. .. .. 26
Door seal .. .. .. .. .. .. .. 26
V acuum pump .. .. .. .. .. .. 26
Condenser .. .. .. .. .. .. .. 27
Cooling Fans.. .. .. .. .. .. .. 27
Bacterial air filter .. .. .. .. .. .. 27
Discharge line filter .. .. .. .. .. 27
Pressure transducer .. .. .. .. .. 27
Solid-state relay board .. .. .. .. .. 27
EMC board .. .. .. .. .. .. .. 28
Printer .. .. .. .. .. .. .. .. 28
Safety V alve .. .. .. .. .. .. .. 28
Band heater Temp. Sensor .. .. .. .. 28
Power switch .. .. .. .. .. .. 28
Float switch .. .. .. .. .. .. .. 28
Cooling ducts .. .. .. .. .. .. 28
Band heater .. .. .. .. .. .. .. 28
Chamber water level sensor .. .. .. .. 28
Manual reset cut-out .. .. .. .. .. 29
Reservoir water filter .. .. .. .. .. 29
V acuum pump maintenance .. .. .. .. 29
Page
Display board .. .. .. .. .. .. .. 30
Special operating modes .. .. .. .. .. 30
Engineering mode.. .. .. .. .. .. 30
Machine Set-up mode .. .. .. .. .. 30
Set-up procedure .. .. .. .. .. .. 30
Setting the autoclave serial number .. 31
Setting the cycles in use.. .. .. .. 32
Setting the display language .. .. .. 32
Setting date and time .. .. .. .. 32
Setting cycle counter .. .. .. .. 32
Errors and error clearing .. .. .. .. .. 32
Leak test procedure .. .. .. .. .. .. 33
Autoclave Calibration .. .. .. .. .. .. 33
General.. .. .. .. .. .. .. .. 33
Calibration procedure .. .. .. .. .. 33
Pressure relief valve test .. .. .. .. 35
Band heater calibration .. .. .. .. .. 36
Functional test .. .. .. .. .. .. 36
PART 4 ILLUSTRATED PARTS LISTS
Illustrated parts list 1: General spares .. .. 41
Illustrated parts list 2: Pipes and valves .. .. 44
Illustrated parts list 3: Heater
and process controls .. .. .. 46
ILLUSTRATIONS
Fig.1 SES 2000 V ac (LS3) autoclave .. .. .. 6
Fig.2.1a Autoclave door handle .. .. .. .. 10
Fig.2.1b Autoclave control panel.. .. .. .. 10
Fig.2.2 Autoclave: general arrangement .. .. 13
Fig.2.3 Autoclave: pipes and valves .. .. .. 14
Fig.2.4 Autoclave: heater and process controls .. 15
Fig.2.5 Sterilizing system schematic diagram .. 16
Fig.3.1 Door interlock microswitch .. .. .. 37
Fig.3.2 Discharge line filter.. .. .. .. .. 37
Fig.3.3 Control panel and switch identities .. .. 37
Fig.3.4 Control board adjustments .. .. .. 37
Fig.3.5 System circuit diagram .. .. .. .. 38
Fig.3.6 Piston vacuum pump .. .. .. .. 40
Fig.3.7 Replacement kit for piston pump .. .. 40
TABLE
Error code table .. .. .. .. .. .. .. 12
Fault Diagnosis table .. .. .. .. .. .. 17
APPENDIX A
Autoclave printer .. .. .. .. .. .. 50
Fig.A1-Fig.A4 Autoclave printer .. .. .. .. 51
APPENDIX B
PCA 424138 and Relay Assembly 112507
modification November 2004 .. .. .. .. 52
APPENDIX C
New fittings for EMC board .. .. .. .. 53
ST-SM45g Page 3 of 53
SES 2000 Vac (LS3) AUTOCLAVE
TECHNICAL DATA
(Standard Version)
Electrical Data
Supply 230V ac at 50/60Hz
Nominal Loading @ 230V - 2kW (8.7A)
Fuses Chassis
F10A, 250V, (x2)
Part No. 380003
Relay board
F5A, 250V (x1)
T2A, 250V (x1, was x 2 see Parts List 3)
T3.15A, 250V (x1)
Safety standards
EN61010-1:1993
EN61010-2-041:1996
Sterilizing Data (for software version 4.xx or later)
Sterilizing time
At 134/137°C 3 mins 15 sec.
At 121/124°C 15 mins
Typical overall cycle 134°C Unwrapped:
time (D indicates 20 minutes
drying included) 134°C Unwrapped:
35 minutes (D)
134°C Wrapped:
53 minutes (D)
134°C Porous:
63 minutes (D)
121°C Unwrapped:
28 minutes
121°C Unwrapped:
42 minutes (D)
121°C Wrapped:
62 minutes (D)
121°C Porous:
70 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 348mm (max)
Porous Load Width 156mm (max)
basket Length 280mm
Height 93mm
Trays Width 183mm
Length 282.6mm
Height l7mm
Tray Loading 1.5 kg per tray
Chamber capacity 10.6 litres
Weight (approx.)
Net 45.7kg
Shipping 50.0kg
Symbols
For use with alternating current
Caution Hot Surface
Caution refer to
accompanying documents
"Porous load + Dry" cycle
"Wrapped + Dry" cycle
Nominal Operating pressures:
134°C cycle - 3.14 bar abs
121°C cycle - 2.11 bar abs
Water reservoir
capacity 3.5 litres
Page 4 of 53 ST-SM45g
"Unwrapped+Dry" cycle
"Unwrapped" cycle
SES 2000 Vac (LS3) AUTOCLAVE
TECHNICAL DATA
(Long Version)
Electrical Data
Supply 230V ac at 50/60Hz
Nominal Loading @ 230V - 2.75kW (12A)
Fuses Chassis
15A, 250V, (x2)
Part No. 301871
Relay board
F5A, 250V (x1)
T2A, 250V (x1, was x 2 see Parts List 3)
T3.15A, 250V (x1)
Safety standards
EN61010-1:1993
EN61010-2-041:1996
Sterilizing Data
Sterilizing time
At 134/137°C 3 mins 15 sec.
At 121/124°C 15 mins
Typical overall cycle 134°C Unwrapped:
time (D indicates 15 minutes
drying included) 134°C Unwrapped:
31 minutes (D)
134°C Wrapped:
46 minutes (D)
134°C Porous:
56 minutes (D)
121°C Unwrapped:
26 minutes
121°C Unwrapped:
41 minutes (D)
121°C Wrapped:
57 minutes (D)
121°C Porous:
67 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)
Porous Load Width 156mm (max)
basket Length 450mm
Height 80mm
Trays Width 180mm
Length 450mm
Height 23mm
Tray Loading 3.5 kg per tray
Chamber capacity 15.6 litres
Weight (approx.)
Net 52kg
Shipping 58kg
Symbols
For use with alternating current
Caution Hot Surface
Caution refer to
accompanying documents
"Porous load + Dry" cycle
"Wrapped + Dry" cycle
Nominal Operating pressures:
134°C cycle - 3.14 bar abs
121°C cycle - 2.11 bar abs
Water reservoir
capacity 3.5 litres
ST-SM45g Page 5 of 53
"Unwrapped+Dry" cycle
"Unwrapped" cycle
SES 2000 Vac (LS3) AUTOCLAVE
PART 1 INTRODUCTION
Part 1
GENERAL (Fig. 1)
1 This Manual contains descriptive, maintenance
and spare parts information for the SES 2000 V ac (LS3)
autoclave units only .
2 The autoclave is a portable, electrically operated
steam unit designed for sterilizing wrapped, unwrapped
or porous loads. A drying phase is included in the porous
and wrapped cycles, which is optional for an unwrapped
cycle.
3 Wrapped loads must be packed single-wrapped
in L.M.G. SMITH BROTHERS “VIEW-PACK SELF
SEAL” pouches, and sterilized using the special pouch
rack accessory . The autoclave will also take cassettes
using a cassette carrier. A wire basket is provided for
sterilizing porous loads.
4 The autoclave operates automatically at the touch
of a single programme selector touch button, and has
eight sterilization programmes.
5 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 page 50.
ASSOCIATED PUBLICATIONS
6 Separate installation and user instructions are
given in the SES 2000 V ac (LS3) autoclave ‘Instructions
for Use’, ST-IM62.
SERVICING
Note: When sterilizing lubricated dental handpieces,
the reservoir water should be changed every week to
prevent contamination of the door seal, and other rubber
components, used in the pressure system.
9 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.
Y our local Health Authority may suggest that you change
the reservoir water more frequently. Eschmann advise
you to follow your local Health Authority’s
recommendations (also see PART 3, MAINTENANCE
para. 5 to 7).
WARNING
When replacing parts during maintenance
procedures ONLY use parts supplied by
Eschmann Equipment or the safety of the
autoclave may be affected.
7 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.
8 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.
Page 6 of 53 ST-SM45g
Fig. 1 SES 2000 Vac (LS3) autoclave
SES 2000 Vac (LS3) AUTOCLAVE Part 2
PART 2 DESCRIPTION
GENERAL (Fig. 1.1)
1 The autoclave is a portable steam unit heated by
electric elements. For sterilization of porous loads, a
vacuum is created in the chamber. The unit is supplied
to suit the mains electrical supply shown in TECHNICAL
DATA (pages 4 and 5).
2 The autoclave is electronically controlled and has
eight sterilizing programmes:
❑ 134°C Porous load with drying
❑ 134°C Wrapped load with drying
❑ 134°C Unwrapped load with drying
❑ 134°C Unwrapped load
❑ 121°C Porous load with drying
❑ 121°C Wrapped load with drying
❑ 121°C Unwrapped load with drying
❑ 121°C Unwrapped load
For typical sterilization cycle times, refer to TECHNICAL
DATA.
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. The
printer (if fitted) will start automatically when the programme
button is pressed.
4 Indication of cycle status or error codes during a
cycle are provided by a digital display and printer (if fitted).
OPERATING FEATURES (Figs. 2.1, 2.2, 2.3 & 2.4)
5 The following equipment, designed for control or
protection, is incorporated in the autoclave:
❑ Process Display Window (Fig. 2.2, item 1). The
digital display indicates the temperature and pressure
inside the chamber. It 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. 2.1b, SW1
to SW4). These are used to select and start
particular cycles. They can also be used to put the
autoclave in the ‘Engineering’ mode as described
later.
❑ Green Light Emitting Diodes (LED’s) (Fig. 2.1b).
There are eight LED’s which flash primarily to
indicate the cycles available for selection that can
be started and, when this has been done, to indicate
the particular cycle which is in progress.
❑ Power On/Off Switch (Fig. 2.1b). This switch
controls the mains power supply to the autoclave.
❑ Overheat Warning Lamp (Fig. 2.1b). Illumination of
this lamp indicates that one of the two protective
overheat cut-outs has operated.
❑ Door Latching Handle (Fig. 2.2, item 3). This handle
operates the door mechanism to secure the door in
the locked position against the chamber face.
❑ Door Safety Latch (Fig. 2.2, item 5). Engages a
safety catch to ensure that the door does not fly
open should there be residual pressure in the chamber
when the door latching handle is operated. It can
also be used to keep the door slightly ajar when the
autoclave is not in use.
❑ Door Interlock Microswitch (Fig. 2.4, item 4). This
is used to signal the controller that the door is
properly closed. It is operated by a simple, adjustable
mechanism and should operate just as the door is
fully closed.
❑ Pressure Door Lock (Fig. 2.3, item 14). 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.
❑ Chamber Pressure Safety Indicator (Fig. 2.1a).
Fitted adjacent to the door latching handle (Fig.2.2
item 3) and operated by the pressure door lock
(Fig.2.3 item 14), it indicates that the chamber is
pressurised (red) and it is unsafe to open the door,
or unpressurised (green) and it is safe to open the
door.
❑ Solenoid Door Lock (Fig. 2.4, item 12). The
solenoid door lock prevents the door being opened
by the operator once the cycle has 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 is also a
‘fault’ the unit power switch must be set to ‘on’ in
order to open the door.
Note: It is necessary to override the electrical door
lock to clear an error code. This is done by setting
the power switch to ‘off’, then, after a few seconds,
setting it back to ‘on’ again while pressing and
holding the ‘P’ selector (SW5) on the front panel (Fig
2.1b).
❑ Water Reservoir (Fig. 2.2, item 16). This is used to
hold distilled or deionized water or water treated by
reverse osmosis which is admitted into the chamber
via the water fill valve. The water reservoir also
receives hot water and steam vapour discharged
from the chamber towards the end of the cycle, via
the discharge valve. The vacuum pump (Fig. 2.3,
item 7) also discharges into the water reservoir.
ST-SM45g Page 7 of 53
Part 2 SES 2000 Vac (LS3) AUTOCLAVE
PART 2 DESCRIPTION
❑ Water Filter. The water filter is fitted on the end of
the water fill pipe in the water reservoir, and filters
the water entering the chamber.
❑ Reservoir Float Switch (Fig. 2.3, item 11). The water
reservoir is fitted with a float switch which will stop
the cycle being started if there is insufficient water
in the reservoir to complete a chamber fill. ‘Fill
Reservoir’ will be displayed should this occur.
❑ Heating Element (Fig. 2.4, item 1). The heating
element consists of a single immersion element
inside the chamber. The heating element is controlled
by a solid state relay and protected from overheating
by a manual reset thermostat. Refer to TECHNICAL
DATA for heater element loading.
❑ Solid-State Relay Board (Fig. 2.4, item 14). See
Appendix B. There are a number of key functions
provided by the relay board:
w Solid state relays (SSR) control the mains
supply to the water heater element (10A), band
heater (10A) and vacuum pump (2A).
w SSR status LEDs, give an indication of drive
status (On/Off).
w Mechanical relay provides additional safety
for heater and pump circuits.
w Fuses for protecting the 20V a.c. supply (3.15A),
condenser fan (2A) and vacuum pump (5A)
see 'Parts List 3'.
w Two voltage regulators.
w Autoclave bleeper.
w Connections for mains loom, signal loom,
temperature and pressure sensors, solenoid
valves, and transformer.
w Interface for front panel, control board, and
printer.
❑ Manual Reset Overheat Cutout (Fig. 2.4, item 21).
The manual reset overheat cutout is fitted at the rear
of the unit and is connected in series with the power
supply switch, band heater overheat cutout,
mechanical and SS relay and heater element. The
manual reset overheat cutout is operated by a fluidfilled capsule clamped to the heating element,
providing protection if the temperature of the heater
surface exceeds 250°C. It will remake electrically if
the reset button at the rear of the cabinet is pressed,
after giving the heater element time to cool.
❑ Band Heater Overheat Cutout (Fig. 2.4, item 24).
The band heater cutout is fitted on the band heater
and is connected in series with the power supply
switch, Manual Reset Overheat Cutout, mechanical
and SS relay and Band Heater. It contains a bimetallic disc thermostat which operates if the
temperature of the heater surface exceeds 250°C.
The cutout will remake electrically if the reset button
is pressed when the heater has cooled.
❑ Fuses. The unit has five fuses:
w Two fuses (Fig. 2.4, item 2) on the rear panel
of the cabinet rated as shown in TECHNICAL
DATA, which are connected in the ‘mains
supply’ to the unit.
w Three more fuses are fitted on the solid-state
relay board (see TECHNICAL DATA).
❑ Transformer (Fig. 2.4, item 17). The transformer
converts the incoming mains voltage to 24V a.c. It
is rated at 50VA.
❑ Water Fill Solenoid Valve (Fig. 2.3, item 4). The
water fill valve controls the water fill sequence. It is
electrically operated from the 24V d.c. supply
generated and signalled from the SSR board.
❑ Water Discharge Solenoid Valve (Fig. 2.3, item 3).
The water discharge valve is used at the end of the
sterilizing cycle to allow water and steam vapour
from the chamber to pass back into the reservoir.
The valve is electrically operated from a 24V d.c.
supply generated and signalled from the SSR board.
❑ Discharge Line Filter (Fig. 2.3, item 12). Prevents
debris from the chamber entering and fouling the
water discharge valve.
❑ Steam Bleed Solenoid Valve (Fig. 2.3, item 2). The
steam bleed solenoid valve operates in conjunction
with the steam bleed valve.
❑ Steam Bleed Valve (Fig. 2.3, item 15). The steam
bleed valve is connected in series with the steam
bleed solenoid valve to bleed steam from the chamber
during the 121°C cycles. It contains a ball and
spring which allows air displaced by the steam
generated in the chamber to pass into the reservoir.
Once steam starts to pass, 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. 2.3, item 16). The safety valve
is fitted on the chamber tee-piece at the rear of the
chamber, and is factory set to release pressure from
within the chamber. It is a primary safety device and
must not be readjusted.
❑ Air In Solenoid Valve (Fig. 2.3, item 5). The air inlet
valve controls the admission of bacteriologically
filtered air to the chamber during the drying phase.
A non-return valve prevents flow from the chamber
to the bacterial filter to keep it dry.
❑ Vacuum Solenoid Valve (Fig. 2.3, item 1). When
open, this valve allows the vacuum pump to suck air
and steam from the chamber.
Page 8 of 53 ST-SM45g
SES 2000 Vac (LS3) AUTOCLAVE Part 2
PART 2 DESCRIPTION
❑ Vacuum Pump (Fig. 2.3, item 7). The vacuum pump
is a two stage diaphragm pump used to suck air and
steam from the chamber. Some models were fitted
with a piston pump (see Fig. 3.6) which is no longer
available, in case of fault, replace it with the current
diaphragm pump.
❑ Condenser (Fig. 2.3, item 6). The condenser pre-
cools air and steam from the chamber before it
enters the vacuum pump.
❑ Bacterial Filter (Fig. 2.3, item 10). The bacterial filter
filters the air entering the chamber.
❑ Chamber Temperature Sensors (Fig. 2.4, item 16).
These are used to sense the chamber temperature
and are fitted at the rear of the chamber. One sensor
controls the temperature within the chamber and the
other controls the displayed and the printed
temperatures.
❑ Band Heater Temperature Sensor (Fig. 2.4, item
15). The band heater temperature sensor is used to
control the band temperature during the drying
phase.
❑ Thermocouple Entry Port (Fig. 2.4, item 23). This is
used to insert a thermocouple into the chamber to
allow the operating temperature to be measured
and, if necessary, adjusted.
❑ Pressure Test Port (Fig. 2.4, item 22). The pressure
test port is used to insert a pressure measuring
probe to monitor the chamber pressure.
❑ Control Board (Fig. 2.4, item 19). The control board
interfaces with the relay board and front panel board
to control every aspect of management of the
autoclave. The main features are:
w Two microcontrollers (U1 and U12 Idents. on PCB)
which receive information from the front panel and
all the sensors (temperature (3 off), pressure, door
interlock, chamber water level, reservoir level). If
any errors are detected they are shown on the
display, and printed (if a printer is fitted) as error
codes (see Part 2, para. 28 and 29).
w Message memory (U13) in four variants
covering all the main languages spoken by
Eschmann customers.
w Trimmer potentiometers for calibration of the
band heater and temperature/pressure
channels.
w Engineering switch for set-up and calibration
modes (see special operating modes page 30).
w Outputs from the control board control the
heaters, pump, and solenoid valves via the
relay board interface.
❑ Front Panel Board (Fig. 2.4, item 13). This board
incorporates the vacuum fluorescent display,
programme select and cancel switches, and
programme indicator LEDs. It interfaces with the
control and relay boards via a 10-way ribbon
connector.
❑ Pressure Transducer (Fig. 2.4, item 7). The pressure
transducer monitors the pressure in the chamber
and generates chamber pressure signals for cycle
monitoring, control, and display.
❑ Printer (Fig. 2.2, item 21). The printer, if fitted, starts
automatically when a cycle button is selected and
will print out a hardcopy of the sterilization cycle.
Details of the printer are given in Appendix A to this
Manual.
❑ Fans (Fig. 2.4, items 10 and 11). Two fans are fitted
in the autoclave. One fan provides cooling for the
condenser and the PCB compartment (via a bleed
conduit). The other fan draws air over the chamber
for rapid cooling between cycles.
❑ Band Heater (Fig. 2.4, item 18). The band heater
heats the chamber during the drying cycle.
❑ EMC Board (Fig. 2.4, item 5). The EMC board
provides electro-magnetic compatibility protection
for the autoclave.
OPERATION CYCLE
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 autoclave operation which occur during a cycle is given
in the following paragraphs.
CAUTION
Ensure that the Autoclave is switched off before
filling the reservoir. DO NOT USE TAP WATER.
Note: When filling the reservoir, consult the 'Instructions
for Use' which provides information on the types of water
that should be used.
7 Power is switched on by selecting the power switch
(O-I) to I (Fig. 2.1b). If the chamber door is open there now
follows a single audible tone accompanied by the display
'SES Vacuum LS3+cycle count+version of software',
which then changes to 'CLOSE THE DOOR'.
8 If the door is closed, when power is switched on, the
display will show 'SES Vacuum LS3+cycle count+version
of software', which then changes to 'OPEN THE DOOR'.
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 (Fig. 2.1b). If the autoclave has a printer it will
automatically start when the programme selector button
is pressed.
ST-SM45g Page 9 of 53
Part 2 SES 2000 Vac (LS3) AUTOCLAVE
PART 2 DESCRIPTION
10 When the door is closed, with the power switched on,
this is sensed by the control board via the door interlock
switch. If any attempt is made to open the door once the
cycle has begun, the display 'ERROR 2' will appear and
an audible signal will sound. Under these circumstances
it is necessary to switch the autoclave off, wait 5 seconds,
reset the error (see Part 3, para. 54) and restart the cycle.
11 The autoclave operates automatically at the touch of
a single programme selector touch button ( Fig. 2.1b), and
has eight programmes:
❑ 134°C Porous load with drying (SW1)
❑ 134°C Wrapped load with drying (SW2)
❑ 134°C Unwrapped load with drying (SW3)
❑ 134°C Unwrapped load (SW4)
❑ 121°C Porous load with drying (SW1)
❑ 121°C Wrapped load with drying (SW2)
❑ 121°C Unwrapped load with drying (SW3)
❑ 121°C Unwrapped load (SW4)
12 Each programme selector button on the control panel
(Fig. 2.1b) will select either the 134°C or 121°C cycles.
The programme indicator lights, at each side of the
programme selector buttons, will change to indicate a
change of selection between 134°C and 121°C each time
Door lock position
Locked
indicator
Safety catch
behind door plate
the appropriate selector button is pressed. In addition,
the display will show the appropriate programme
description to confirm the programme that has been
selected. Once the programme and the temperature
range has been selected, the sterilization cycle will start
automatically, after a delay of approximately four seconds.
13 The printer, if fitted, will start printing and, as the
cycle progresses, various display messages will appear
in the display window to indicate the programme status.
Note: If a programme is started in error, it can be cancelled
by pressing the 'P' selector button (SW5), provided that the
cycle has not reached the water fill stage.
14 When a cycle is selected (SW1- SW4 pressed),
'CYCLE STARTED' will be displayed, quickly followed by
'VACUUM ON', indicating that the vacuum pump has
started, and the vacuum solenoid valve has opened to
evacuate the air from the chamber.
15 When the pressure in the chamber has decreased to
the required value for the programme selected, the water
fill valve will open and 'FILLING' will be displayed, indicating
that water is being sucked from the reservoir and into the
chamber.
16 When the cycle has started, the door cannot be
opened due to the electric door lock and vacuum force on
the door.
Unlocked
Fig. 2.1a Autoclave door handle
Fig. 2.1b Autoclave control panel
Chamber pressure
indicator
1 7 When the correct quantity of water has entered the
chamber, the water fill valve closes together with the
vacuum valve. The heater, controlled by the control
board, will switch on, and the pressure in the chamber will
increase. This phase is indicated by 'PULSING' being
shown on the display.
1 8 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.
19 Temperatures are displayed with a resolution of
0.1°C, using signal averaging to ensure a stable, accurate
display.
20 Control of the cycle is fully automatic with temperature
information being monitored by temperature sensors.
Timing is controlled by the control board and cycle times
cannot be adjusted. By comparing measured values with
known time/temperature relationships, the control board
is able to detect faults such as lack of water at the fill
stage, or loss of water and steam during the process, and
Page 10 of 53 ST-SM45g
SES 2000 Vac (LS3) AUTOCLAVE Part 2
PART 2 DESCRIPTION
it will indicate such problems by displaying errors codes
such as 'ERROR 3' or 'ERROR 4' respectively, which will
be accompanied by an audible warning signal (see Error
Code Table page 12).
21 The autoclave operates at temperatures slightly
above the usual recommended minimums. The operating
temperature for the 121°C cycle is set to 122°C, and the
134°C cycle is set for 135°C.
22 As the cycle enters the sterilization phase, the
display shows 'STERILIZING'. At the end of the sterilizing
phase the heater is turned off and the discharge valve is
opened to discharge water and steam from the chamber.
This phase is indicated by 'CONDENSING' being shown
on the display.
23 Once the controller detects that chamber temperature
and pressure have fallen to a safe level, the display
'CYCLE COMPLETE' will be shown to indicate that the
cycle is complete. When the chamber door is opened the
display will show 'CLOSE THE DOOR'.
Note: If the autoclave has a printer, the printout will
include the following details:
❑ Autoclave type and serial number.
❑ Date and time of sterilization cycle.
❑ Counter indication (five digits with leading zeros).
❑ Sterilization cycle type, e.g. 134°C without drying.
❑ Sterilization cycle time, temperature, and pressure.
❑ Sterilization cycle ended message.
Operating information relating to the printer is given in
Appendix A to this Manual.
24 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 control
board will ensure a satisfactory sterilization cycle even
when these factors vary over wide ranges.
25 If a cycle employing a drying phase is selected,
operation to the end of the sterilizing phase is as described
previously. After discharge of steam and water back into
the reservoir, however, the display 'DRYING' will be
indicated, together with the time remaining to the end of
the cycle. During the drying phase, operation of the
autoclave will alternate between vacuum pulses and
filtered air inlet pulses to achieve optimum drying.
2 6 The length of the drying phase will vary according to
the programme selected, and the chamber band heater
will operate to promote drying. At the end of the drying
phase, the display 'CYCLE COMPLETE' will appear
indicating that the door can be opened.
DISPLAY MESSAGES
2 7 Throughout a selected cycle the following symbols
may appear on the digital display:
Display Meaning
OPEN THE DOOR Door was closed when the
autoclave was switched 'on'.
PLEASE WAIT* The autoclave is measuring
atmospheric pressure
CLOSE THE DOOR The door is open and the cycle
cannot start.
READY FOR USE Waiting programme selection.
CYCLE STARTED Programme selected and cycle
started.
VACUUM ON Chamber air/steam discharge
in progress.
FILLING Water entering chamberprior to
steriliszation
PULSING Pre-sterilization steam
treatment.
STERILIZING Sterilization in progress.
CONDENSING Discharging water and steam
from chamber.
DRYING Load being dried (time remaining
to the end of cycle will also be
shown).
CYCLE COMPLETE Cycle completed successfully.
* Only applicable to software version 5.2 or above (as
shown briefly on display when autoclave first switched on).
ERROR INDICATION
General
2 8 If an error occurs during the cycle, an error code will
be displayed (see the Error Code Table on page 12).
29 If an error occurs during a cycle, the control board will
cancel the cycle (see Fault Diagnosis, and Errors and
Error Clearing in Part 3).
Note: These error codes will generally require investigation
by an Eschmann trained engineer. If an error occurs
during the cycle, the printer (if fitted) will print out the date
and time, the message 'CYCLE FAILED' and the appropriate
error code. Information relating to the printer, if fitted, is
given in Appendix A to this Manual.
ST-SM45g Page 11 of 53
Part 2 SES 2000 Vac (LS3) AUTOCLAVE
PART 2 DESCRIPTION
ERROR CODE TABLE
Display Meaning / Cause
POWER FAILURE Temporary failure in the
(Error 1 not shown) mains supply to the unit.
Error 2 Faulty or incorrectly adjusted
door switch, or door not fully
closed at start of cycle.
Error 3 Water failed to enter chamber
from reservoir.
Error 4 Water level in chamber has
dropped during run-up to
sterilizing cycle.
Error 5 Heater element not working
during run-up to sterilizing phase.
Error 6 Control channel low temperature.
Error 7 Control channel high
temperature.
Error 8 Display channel low
temperature.
Overheating
30 In the unlikely event of overheating, the red overheat
warning lamp (see Fig. 2.1b and Fig. 2.4 item 8 ) at the
front of the autoclave will illuminate. If this happens, first
allow 10 to 15 minutes to elapse for the autoclave to cool,
then check the water level in the reservoir and top-up if
required. When the water level is correct, press the
'PRESS TO RESET' button at the rear of the cabinet (Fig.
2.4 item 21) and restart the cycle as normal. If the fault
persists, switch off the autoclave and call an Eschmann
Trained Engineer.
Error 9 Display channel high
temperature.
Error 10 Insufficient first vacuum pulse.
Error 11 Insufficient second vacuum
pulse.
Error 12 No steam pulse.
Error 13 (i) Before filling takes place
= Air Detector test failure
(ii) At beginning of sterilization =
Steam quality error.
Error 14 Insufficient drying vacuum.
Error 15 Sensor system failure.
Error 16 Clock speed error during
sterilizing phase.
Error 17 Band heater not achieving
setpoint temperature during
drying phase.
FILL RESERVOIR Water level in reservoir has
dropped below 'MIN' mark.
Page 12 of 53 ST-SM45g
SES 2000 Vac (LS3) AUTOCLAVE Part 2
Note: Some autoclaves will have a
different pump to that shown. See
maintenance section and parts list for
pump replacement details.
PART 2 DESCRIPTION
1 Process display window 10 Seal retaining rim 19 Front panel
2 Control panel 11 Aerotight nut 20 Chassis
3 Door latching handle 12 Door safety catch 2 1 Printer
4 Pressure door 13 Pressure chamber assembly 22 Foot
5 Door latch 1 4 Work tray 2 3 Door beam
6 Pressure safety indicator 1 5 Reservoir lid 2 4 Door knob
7 Door cover 16 Reservoir 25 PCB cooling conduit
8 Seal retaining disc 1 7 Cover screw 2 6 Link
9 Door seal 18 Unit cover
Fig. 2.2 Autoclave: General Arrangement
ST-SM45g Page 13 of 53
Part 2 SES 2000 Vac (LS3) AUTOCLAVE
PART 2 DESCRIPTION
Note: Some autoclaves will
have a different pump to
that shown. See
maintenance section and
parts list for pump
replacement details.
'A' - Stud coupling nut
1 Vacuum valve 9 Transducer coil
2 Steam bleed solenoid valve 10 Bacterial air filter
3 Water discharge valve 11 Reservoir float switch
4 Water fill valve 1 2 Discharge line filter
5 Air in valve 13 Non-return valve
6 Condenser 1 4 Pressure door lock
7 Vacuum pump 15 Steam bleed valve
8 Pump foot 16 Safety valve
Fig. 2.3 Autoclave: Pipes and Valves
Page 14 of 53 ST-SM45g
SES 2000 Vac (LS3) AUTOCLAVE Part 2
PART 2 DESCRIPTION
Note: Some autoclaves will have a
different pump to that shown. See
maintenance section and parts list for
pump replacement details.
1 Heating element 9 ON/OFF (O/I) switch 1 7 Transformer
2 Mains fuses 1 0 Enclosure fan 18 Band heater
3 Mains cable 1 1 Condenser fan 19 Control board
4 Microswitch 12 Solenoid door lock 2 0 Printer
5 EMC board 13 Front panel board 21 Manual reset overheat cut-out
6 Choke 14 Solid-state relay board* 22 Pressure test port
7 Pressure transducer 15 Band heater temperature sensor 23 Thermocouple entry port
8 Overheat warning lamp 16 Chamber temperature sensors 2 4 Band heater overheat cut-out
2 5 Bulb (for Manual Reset 21)
* see Appendix B
Fig. 2.4 Autoclave: Heater and Process Controls
ST-SM45g Page 15 of 53
Part 2 SES 2000 Vac (LS3) AUTOCLAVE
PART 2 DESCRIPTION
Fig. 2.5 Sterilizing System Schematic Diagram
Page 16 of 53 ST-SM45g
SES 2000 Vac (LS3) AUTOCLAVE Part 3
PART 3 MAINTENANCE
FUSES (Fig. 2.4 )
1 The autoclave is protected by five fuses. Two mains supply fuses are fitted on the rear cover of the autoclave
(Fig. 2.4 item 2). Three more fuses are fitted to the solid state relay board (Fig. 2.4. item 14). All fuse ratings are given
in the TECHNICAL DATA section.
FAULT DIAGNOSIS
2 A number of typical faults which could occur, their possible causes and how to remedy them are listed below. For
maintenance procedures refer to Parts Replacement and Adjustment.
Note: Cross references in the ‘Remedy’ column (e.g. para.10) refer to paragraphs in the Parts Replacement and
Adjustment section that follow later in Part 3.
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 (b) Replace fuse(s)*.
(rear panel).
(c) Faulty power switch. (c) Replace power switch
(para 31).
(d ) Solid-state relay board ( d) Replace fuse*.
fuse blown or loose.
(e ) Transformer failed. (e ) Check transformer secondary
voltage (20V a.c. rms).
Replace transformer if
output is zero (para 8).
(f) Short circuit on (f) Check sensor, fill valve, vent
24V circuit. valve etc. for short circuit
Replace where necessary.
(g ) Short circuit on solid-state ( g ) Check SSR board is correctly
relay board. fitted in bottom guide,
with correct clearance from
dividing panel. Also see
Appendix B
*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.
Continued
ST-SM45g Page 17 of 53
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