Part 3 SES 2000 Vac (LS3) AUTOCLAVE
Page 36 of 53 ST-SM45g
PART 3 MAINTENANCE
Band heater calibration (Fig. 3.4)
65 Carry out band heater calibration whilst in calibration
mode as follows:
Notes:
(i) A half-turn of V7 (Fig.3.4) clockwise or
anticlockwise, results in approximately 3°C change
of temperature.
(ii) The time period between successive temperature
peaks is approximately three minutes.
(iii) The band heater must be set during the first 15
minutes of 'drying'; an internal timer switches the
heater off for the last five minutes of 'drying'.
a Press switch SW2 (Fig.3.3). This will cause the
chamber to discharge to reservoir and then
automatically start a 'drying' phase for 20 minutes.
b When the 'drying' phase has started, observe the
band heater temperature as shown on the chart
recorder (see para 62b for position of thermocouple).
The temperature peaks must be between 154 and
158°C. If necessary, adjust V7 on control board
(Fig. 3.4).
c When the band heater temperature has been
satisfactorily set wait until the calibration cycle has
ended, stop the chart recorder.
d Seal V7 on control board (Fig.3.4) with a small
quantity of anti-tamper sealant (Part No.670678)
between the adjuster screw and the body, not in the
screw slot.
Functional test
66 Carry out a functional test as follows:
a Close the autoclave door and press switch SW1
(Fig.3.3) to select a 134°C POROUS + DRY cycle.
Make sure that temperature recorded on the chart
recorder is within 134°C to 137°C during the sterilizing
phase.
b On completion remove the chart recording of the
calibration and the functional test.
c Remove the temperature and pressure probes and
refit covers to ports (Fig.2.4 items 23 and 22).
d Refit cover to autoclave.
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