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Page 24 of 85 Pages
Unsealed bottles (cooling without compressed air)
On completion of sterilization, steam is exhausted
from the chamber at a slow rate. When chamber
pressure goes down to atmospheric pressure, water
starts flowing through the cooling coil mounted
around the outer side of the chamber. On conclusion
of the cycle the water flow is stopped automatically,
process is completed and it is possible to open the
door and take out the sterilized goods from the
chamber.
4.6
Leakage Test
Vacuum is produced in the chamber down to P
1
=15 kPa. At this stage all
the valves close. The autoclave remains in this stage for 5 minutes. This
period enables the condition in the chamber to reach equilibrium. After the
5 minutes have elapsed the printer records the pressure that is referred to
as P
2
. At this point the test begins and lasts 10 minutes. At the end of the
test, the printer records the results. The pressure at the end of the test is
referred to as P
3
. The rate of change of P
3
-P
2
shall not exceed 0.13
kPa/min.). If P
3
-P
2
exceed 0.13 kPa/min the printer will print “FAIL”. If
P
3
-P
2
is within the required value, the cycle will end normally.
Operations Sequence
Vacuum is produced into the chamber down to 15-5 kPa.
The vacuum pump stops.
Note: During the test period the autoclave is not heated.
4.7
Exhaust
When the timed sterilization cycle is complete, the unit enters
into the exhaust stage, provided that a program other than the
liquid program was selected. The steam is exhausted from the
chamber, bringing the internal pressure down to atmospheric
pressure.
Note: In the Bio-Hazard cycles (optional for BH, bio-hazard models), all
exhaust from the chamber before completion of the Sterilization
phase are performed through the bio-hazard filter.
4.8
Drying (PV
–
pre-vacuum nodel only)
Drying stage; vacuum is built up and the coil heats the chamber
for time set in Dry Time parameter.
4.9
Vacuum Test Program (PV
–
pre-vacuum model only)
Vacuum is produced in the chamber down to P
1
=15 kPa. At this stage all
the valves close. The autoclave remains in this stage for 5 minutes. This
period enables the condition in the chamber to reach equilibrium. After
the 5 minutes have elapsed the printer records the pressure that is referred
to as P
2
. At this point the test begins and lasts 10 minutes. At the end of