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3.5 Program 5 (5 - B&D Test)
This is a test program, with fixed sterilization parameters 273ºF and 3.5
minutes that cannot be modified by the operator.
Nominal parameters
♦ Sterilization temperature: 273ºF - 279ºF.
♦ Sterilization time: 3.5 minutes.
♦ Dry time: 2 minutes.
Operations Sequence:
♦ Pre Vacuum stage; four vacuum pulses remove 99.5% of the air by
drawing the chamber down to -11 psig (22 Ih). At the end of the Pre
Vacuum stage steam enters the chamber from the jacket until the
sterilization temperature and pressure is reached.
♦ Sterilization stage; temperature and pressure are maintained
constant at the preset level for the programmed sterilization time, of
3.5 minutes, by periodic injection of steam from the jacket
♦ Exhaust stage; steam is rapidly exhausted from the chamber
allowing the chamber pressure to reach 0 psig (atmospheric
pressure).
♦ Post Vacuum Drying stage; while the jacket is heated to maintain a
high temperature environment within the chamber, a single vacuum
pulse is created for 2 minutes in order to release and remove
residual moisture from any items within the chamber.
t4
8.5 psig
TIME
PRESSURE (PSIG)
TEMPERATURE
Ambient Pressure
and Temperature
t1
t2
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