SES 2000 Vac (LS3) AUTOCLAVE Part 2
ST-SM45g Page 9 of 53
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.
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