Tuttnauer 3870 EHS - Program 3 (3-Wdry 250)

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3.3 Program 3 (3-WDry 250)
Program 3 is recommended for delicate wrapped or unwrapped
instruments and other material which the manufacturer recommends
autoclaving at temperatures of up to 250ºF with a drying stage
Nominal parameters
♦ Sterilization temperature: 250ºF - 256ºF
♦ Sterilization time: 30 minutes.
♦ Drying time: 20 minute.
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 s
team 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.
Note:
The sterility of instruments processed in unwrapped cycles cannot be maintained
if exposed to non-sterile environment.
TIME
PRESSURE (PSIG)
TEMPERATURE
Ambient Pressure
and Tem
p
erature
t1 t2
t
3
-11 psig (22 Ih)
t1 = Pre Vacuum stage
t2 = Sterilization stage
t3 = Fast Exhaust stage
t4 = Post Vacuum Drying stage
= Pressure
= Temperature
8.5 psig
t4