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5.4. Program 4: NoDry 121
Program 4 is recommended for sterilizing unwrapped instruments at a
temperature of 121ºC / 250ºF without drying stage, which its
manufacturer declares their compliance to be sterilized in the following
conditions:
The solid load shall not exceed 8kg (17.6 lb).
Nominal Parameters
• Sterilization temperature: 121ºC (250ºF).
• Sterilization time: 20 minutes.
• Max. cycle time: 40 minutes.
• Average cycle time: 35 minutes.
Operation Sequence
• Air removal phase; two vacuum pulses as described in the diagram
below. Saturated steam is introduced into the chamber until the
sterilization temperature is reached.
• Sterilization phase; temperature and pressure are maintained
constant at the pre-set level for the sterilization time.
• Fast exhaust phase; steam is rapidly exhausted from the chamber
until pressure equalizes atmospheric pressure.
Note:
The sterility of instruments processed in unwrapped cycles cannot
be maintained if exposed to non-sterile environment.
Cycle end
Cycle start
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