Tuttnauer 6671130, Operation & Maintenance Manual

Page: 74 / 143

MAN205-0195042EN Rev. A Aug. 2011
Page 68 of 137 pages
Program 11 Bowie & Dick Test
This program is intended to test residual air in the chamber. The parameters are locked
in such a way that they cannot be changed. These are the parameters:

Sterilization temperature 134ºC

Sterilization time 3.5 minutes

Drying period of 2 minutes
The Bowie & Dick test pack should be placed horizontally on the bottom of the loading
rack, near the door and over the drain.
Press 1 and 1 again within 2 seconds of each other. This selects cycle "11" Bowie &
Dick test. Press START to run the test. This is a pre-programmed and cannot be
changed.
Performance Description:
Residual air
is displaced due to 4 vacuum pulses (down to 25 kPa) and 3 steam pulses
up to 160 kPa. The 4
th
vacuum pulse is followed by bringing saturated steam into the
chamber to the required sterilization temperature.
Sterilization period is controlled so that the sterilization temperature will not drop
bellow the required temperature, nor will it increase by more than 3ºC. The saturated
steam conditions are controlled in such a way that the fluctuation of pressure will not
drop below 1 kPa, not will it increase above 3 kPa above the high limit of the Ste.
Temperature.
Fast exhaust stage is performed by discharging rapidly the pressure from the chamber.
The vacuum pump is activated to create a vacuum in the chamber for drying.
Drying is achieved by evacuating the vapors from the chamber in an "under pressure"
phase for a period of 2 minutes.
Pressure equilibration enables the door to be opened. Air is introduced into the
chamber through a microbiological filter until equilibrium is reached with atmospheric
pressure.
Important:
In order to obtain good sterilization results, dry time is essential.
Note:
The temperature of the chamber must be below 110ºC and the pressure must
be below 115 kPa to enable the door to be opened.
Pass/Fail step
Remove the hot test pack from the autoclave carefully.
When using the B& D test pack, or any other PCD, (Process Challenge Device),
observe the following:
The color shall be a uniform black. If the color is not
uniform black the verification should be ejected and notify your authorized
Tuttnauer technical representative for service.
Program: 11- Bowie & Dick Test
0 kPa
25 kPa
50 kPa
100 kPa
104°C/ ~115 kPa
134°C/ ~305 kPa
160 kPa
121°C/ ~205 kPa
134°C 3.5 min
Ex Mode 1
2 min