22
3.4 Program 4
3.4.1 Program 4 - (4 - Fast 273)
This program is available only in the 2540EHS
Program 4 is recommended for wrapped instruments, non-
lumened and materials that the manufacturer recommends
autoclaving at temperatures of up to 273ºF with a drying stage.
Nominal parameters
♦ Sterilization temperature: 273ºF - 279ºF.
♦ Sterilization time: 4 minutes.
♦ Dry time: 20 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 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 20 minutes in
order to release and remove residual moisture from any
items within the chamber.
TIME
= Pressure
= Temperature
t1
PRESSURE (PSIG)
TEMPERATURE
t1 = Pre Vacuum stage
t2 = Sterilization stage
t3 = Fast exhaust stage
t4 = Post Vacuum Drying stage
Ambient Pressure
and Temperature
t2
t3
-11 psig (22 Ih)
8.5 psig
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