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B CLASSIC / B FUTURA / S CLASSIC - TECHNICAL MANUAL
FUNCTIONING
1.8 3rd PRESSURE RISE / STERILISATION PROCESS
Alternating pressure drops to a vacuum value of – 0.80 bar with two pressure rise phases up to 1.00 bar ensures that
a residual amount of air of 0.06% of total initial air is retained.
After the phases outlined above, a 3
rd
PRESSURE RISE begins that introduces the STERILIZATION PROCESS prop-
er, which occurs at 134°C/2.15 bar or 121°C/1.10 bar, depending on which type of cycle has been selected.
During this pressure rise phase, the different components are in the same (on/off) states as during the previous phases.
3
rd
PRESSURE RISE - 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
Step 1
from -
0.80 to
0.00
Off
open
On
open
Off
closed
On (1)
Off
closed
ON ON OFF ON ON
Step 2
from 0.00
to 1.00
Off
open
Off
closed
Off
closed
Off (2)
Off
closed
ON ON OFF ON ON
After the pressure and temperature values set for the selected sterilization cycle have been reached, a BALANCING
phase of nearly 15” is activated to stabilize temperature inside the chamber before the PROCESS phase proper begins.
Maximum, normal and minimum pressure values to be observed during the BALANCING and PROCESS phases are
set for each cycle.
Cycle type Pmax Pnorm Pmin
121°C 1.14 1.11 1.08
134°C 2.17 2.14 2.12
During the BALANCING and PROCESS phases, the control system takes the following actions as required:
- it powers on the tube bundle heating element of the chamber to raise value T in the chamber
- it powers on EV1 to discharge steam from the chamber when pressure rises above the allowed Pmax value
- it powers on the water injection pump/EV6 to inject steam into the chamber when pressure drops below the allowed
Pmin value
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