CO
2
Incubator BB 150 Operating Instructions
19
4.
Description of the device
4.5
ContraCon decontamination routine
The ContraCon decontamination routine is used to
decontaminate the complete work space including all installed
components and sensors.
During this routine, a moist and wet atmosphere with highly
decontaminating effect is created for 9 hours at a temperature
of 90° C.
The effectiveness of the ContraCon decontamination routine has
been tested and certified by independent institutes. Information
about these tests is available at request from Thermo Electron
LED.
The entire program run of the ContraCon decontamination routine
will take approx 25 hours.
After the run has been completed, the device must be reactivated
using the autostart routine.
NOTE – Thermal protection
If the thermal protection for the device
responds, the ContraCon decontamination
routine can only be be started after the cause
of the failure has been repaired or reset
(see Section 6.13).
4.6
Sensor system
Fig. 6:
The blower wheel and two sensor modules are integrated
in the baseplate [1] of the measuring cell:
• Sensor [2] for the measurement of the work space tempe-
rature and of the thermal protection,
• CO
2
sensor [3] for the measurement of the CO
2
content in
the work space atmosphere.
The sensor for the measurement of the work space temperature
as well as the CO
2
sensor form part of the control system of
the device. Their measured values are compared to the set no-
minal values. Based upon this data, the control system cont-
rols heating and CO
2
supply.
The blower intermixes the supplied gases and ensure uniform
temperature distribution within the work space.
The thermal protection has been preprogrammed at the fac-
tory and cannot be changed. It protects the stored cultures from
overheating. If the temperature is exceeded by more than
1° C, the thermal protection responds and the work space tem-
perature is automatically reduced to the set nominal value so
that the incubation process can be continued even in case of
a failure. Any response of the thermal protection will simulta-
neously trigger an audible and visual alarm.
Fig. 6
Temperature and CO
2
sensor
