Page 29 of 101 pages
Program 13 "Bowie & Dick Test”
This program is intended to test residual air in the chamber. The parameters
are locked in such a way that they can not be changed. These are the
parameters:
♦
Sterilization temperature 274ºF
♦
Sterilization time 3.5 min.
♦
Drying period of 2 min.
Performance description:
Residual air
is displaced due to 4 vacuum pulses (down to 25 kPa) and 3
steam pulses up to 160 kPa. The 4th vacuum pulse is followed with
introducing saturated (controlled) steam into the chamber to the required
sterilization temperature.
Sterilization period
is controlled in such a way that the sterilization
temperature will not drop below the required temperature, neither will increase
by more than 37.4 ºF. The saturated steam conditions are controlled in such a
way that the fluctuation of pressure does not allow a drop below1kPa, neither
an increase of 3 kPa above the high limit of the Ste. Temperature.
Fast exhaust
stage is performed by discharging rapidly the pressure from the
chamber. When the pressure reaches a level of 115 kPa the ejector is
activated till a pressure drop to 25 kPa.
Drying
is achieved by evacuating the vapor from the chamber in
"under-pressure” phase along a period of 5 minutes.
Pressure equilibration
. To enable the door to be opened, air is introduced to
the chamber through a microbiological filter till equilibrium with atmospheric
pressure.
Note:
The pressure must be below 115 kPa to enable the door to be opened.
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