Name
Date
Designation
Prepared
JF 05.07.13
Service Manual BB 150
Index
Name
Date
Document No.
Page
File
50078923_04_CN
50 079 823
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4.7.6 TEMPERATURE MEASUREMENT/REGULATING CIRCUIT –
DECONTAMINATION MODE AT 90°C
Short description of the decontamination routine:
With 300 ml of water in the sample chamber, the decontamination heaters raise the
unit temperature to 90 °C. The exterior door is also heated in order to prevent
condensation from forming.
Press the -90 °C- key to start the decontamination routine.
Warm-up phase:
The unit heats up to the decontamination temperature.
Decontamination phase:
Duration: 9 hours. Once the unit reaches the lower limit band value (85 °C), the
decontamination time holding counter starts.
Condensation phase:
Duration: 6 hours. The unit's base heater is turned off during this phase (water will
condense on the floor of the sample chamber as it cools).
Cool-down phase:
The unit cools down naturally to the specified set incubation temperature. During this
phase, the exterior door is heated with a base load factor to reduce the amount of
condensation that forms on the glass door.
Reheat phase:
Duration: 3 hours. In this phase, the unit operates at, for example, 37 °C. The base
heater remains off. Heat applied to the interior sample chamber surfaces and the
glassdoor removes as much condensation as possible.
To reactivate the base heater and switch to the incubation mode, either perform a
mains reset, or press the -90°C- key to exit the decontamination routine.
Remaining time table:
The remaining decontamination routine time shown in the CO
2
display only indicates
the holding value until the end of the decontamination routine!
The total time is calculated from the values of the time-controlled phases and the
values from a temperature/reset table for the set-value-controlled phases.
