5
EN
TECHNICAL MANUAL - B CLASSIC / B FUTURA / S CLASSIC
FUNCTIONING
1.3 1st VACUUM PHASE
This phase marks the beginning of the sterilization cycle proper. As the vacuum pump is activated, the maximum
vacuum level in the chamber, namely – 0.80 bar, can be reached (S 17 Classic -0.75 bar).
The tube bundle heating element of the chamber and the generator heating element remain activated throughout this
phase so the steam generation can be managed properly.
The 1
st
VACUUM PHASE must ensure that as much air as possible is removed from the chamber. In order to achieve
this, repeated steam shots are injected as pressure drops to aid removal of any remaining air.
These steam shots are operated automatically according to pressure value in the chamber as follows:
- steam shot starts > chamber pressure reading – 0.70
- steam shot ends > chamber pressure reading – 0.60
This sequence is repeated 3 times, and pressure drops until reaching the preset vacuum level of – 0.80 bar. This value
triggers the next phase, namely the 1
st
PRESSURE RISE.
The control system operates the solenoid valve EV2 (air inlet) when it is needed to improve vacuum pump perfor-
mance, which may be the case during the last pressure drop phase.
1
st
VACUUM PHASE - components on state
STATE
EV1
Drain
High (NO)
EV2
Air inlet
(NC)
EV3
Drain Low
(NC)
EV4
Drain
bypass
(3V)
EV5
Air inlet to
chamber
(NC)
FAN
WATER
PUMP
VACUUM
PUMP
CHAMBER
BUNDLE HTR
GENERATOR
HTNG ELMT
Drop
to
vacuum
On
closed
Off
closed
On
open
On (1)
Off
closed
ON OFF ON ON ON
Steam
shot
Off
open
Off
closed
Off
closed
On (1)
Off
closed
ON ON ON ON ON
A preset minimum pressure value can be reached during the vacuum pulses; this value varies with each vacuum pump
type installed on the autoclaves.
VACUUM PUMP PMIN [bar]
Type H5 -0.75
Type H5P3 -0.80
Type EVO10 -0.80
Type EVO30 -0.80
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