Part 3
SES 2000 Vac (LS3) AUTOCLAVE
Page 34 of 53
ST-SM45g
PART 3 MAINTENANCE
b With the autoclave cover removed, attach the bare
wire tip of a twisted thermocouple tightly against the
top outer surface of the band heater, next to the
protective cover and as close as possible to the
temperature sensor.
CAUTION
Take care not to damage the internal seals in the
test port fitting. Avoid using a sharp pointed
thermocouple probe, if possible.
c Insert temperature probe into the thermocouple
entry port (Fig. 2.4 item 23) on the top chamber
fitting. The end of the probe must be inserted so that
it protrudes approximately 20mm from the face of
the chamber fitting.
d Insert pressure probe into the pressure test port (Fig.
2.4 item 22) on the safety valve chamber fitting.
Ensure that probe is fully inserted into the port.
e Connect autoclave to mains supply and switch on.
63
Calibrate the autoclave as follows:
a Close the door and push switch SW2 (Fig.3.3) to
start a 121°C W DRY cycle. If the 121°C
cycles are not available for selection use ‘All Cycles’
mode (para.39 fifth bullet point), then select 121°C
W DRY Cycle.
b While 'VACUUM ON' is displayed, and before 30
kPa is reached, press-and-hold switch SW6 (Fig.3.4)
on the control board until two bleeps are heard
indicating that 'Calibration Mode' has been selected,
then release switch SW6.
Notes:
(i)
The display will continue to work as for a normal
cycle. The unit will heat up to 121°C to allow initial
calibration, with a sterilizing time of 15 minutes.
(ii) To increase to 134°C, press and release switch
SW1 (Fig.3.3). SW1 must be pressed within 15
minutes or the cycle will condense as for a normal
cycle. A single bleep will be heard and the temperature
will rise until the 134°C sterilize conditions are
reached.
(iii) Repeated pressing of switch SW1 will toggle between
134°C and 121°C, resetting the sterilizing time to
one hour at each selection.
c The display will show '121°C W DRY' on
the top line, and initially 'VACUUM ON' on the
bottom line. The pressure (kPa), displayed in the
bottom right hand corner, should be steadily
decreasing.
d After approximately four minutes from start of cycle,
adjust V5 (clockwise to increase) on control board
(Fig. 3.4) so that the autoclave kPa display reading
matches the digital display on the data-recorder.
Note: The autoclave display can only indicate in steps of
2 kPa, therefore it has to be adjusted to the nearest 1 kPa
of the data recorder reading, rounded up or down as
required.
e During heating to 121°C check that air vent valve
solenoid operates at approximately 104 kPa and
that steam/water then flows out of the exhaust tube
in the reservoir manifold.
f
Make sure the door pressure lock engages before
the pressure reaches 120 kPa. When door pressure
lock engages, check door pressure indicator (Fig2.1a)
changes from full green to full red when viewed
horizontally and level with the indicator.
g Make sure that there are no audible or visible leaks.
h When the temperature has stabilized in the
'sterilization' phase, adjust V1 (clockwise to increase)
on control board (Fig. 3.4), until as close as possible
to 122°C is indicated on the chart recorder.
Notes:
(i)
If the temperature trace has a 'sawtooth' waveform,
calibrate the peaks to 122°C. The temperature
trace must always be above 121°C.
(ii) The autoclave display is not important at this stage.
i
When the temperature setting is correct, check the
autoclave process display. If necessary, match the
display temperature to the temperature shown on
the chart recorder by adjusting V3 (anti-clockwise to
increase) on control board (Fig 3.4).
j
Push switch SW1 (Fig.3.3). A bleep should be heard
and the temperature will increase. Wait until the
trace on the chart recorder has stabilized in the
'sterilization' phase.
k Adjust V2 (anti-clockwise to increase) on control
board (Fig. 3.4), until as close as possible to 135°C
is indicated on the chart recorder.
Notes:
(i)
If the temperature trace has a 'sawtooth' waveform,
calibrate the peaks to 135°C. The temperature
trace must always be above 134°C.
(ii) The autoclave display is not important at this stage.