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4.5 Description of Operation
4.5.1 Air removal
The PV (pre-vacuum) models are equipped with a vacuum pump for
performing the air removal stage. Before the sterilization stage, one or
two vacuum pulses (according to the cycle) are built in the chamber.
Removing air pockets in the autoclaved material improves the
penetration of the steam during the sterilization stage.
In EL-D and ELC-D models positive pulses are built (steam inlet, then
exhaust).
4.5.2 Heat
The ELPVG-D is equipped with a steam generator that maintains a
constant steam pressure. After a cycle has been initialized and air
removal stage has been completed, steam is introduced into the
chamber. The temperature and pressure in the chamber increase until
appropriate levels are reached. Sensors located inside the chamber
control the temperature and pressure levels.
4.5.3 Sterilization
The sterilization temperature is factory set at 134
C (273
F) for
instruments and at 121
C (250
F) for liquids and other materials for
which this temperature is appropriate. These settings may be modified
before each cycle. When sterilization temperature is reached, the timed
sterilization cycle begins.
4.5.4 Cooling (Optional)
The autoclave is designed to operate two liquid cooling cycles, as
follows:
Sealed bottles (cooling with compressed air)
On completion of the sterilization stage, feed water starts flowing
through the cooling coil mounted around the outer side of the chamber.
Compressed air is injected inside the chamber and keeps a constant
air pressure to balance the internal pressure of the liquids inside the
bottles. Compressed air is passed through a 0.2µ microbiological filter.
When temperature of the liquids reaches the final set temperature, the
cooling stage is completed, flowing water and compressed air is
stopped, pressure in the chamber goes down to atmospheric pressure.
At this stage, the door of the autoclave can be opened and the
sterilized materials can be taken out of the chamber.
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.
Summary of Contents for 2840 ELG-D
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