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CB-S / CB-S-UL (E7) 06/2020 page 45/119
11. Temperature safety devices
11.1 Over temperature protective device (class 1)
The CO
2
incubator is equipped with one (CB-S-UL) or two (CB-S) internal temperature safety devices
class 1 acc. to DIN 12880:2007. They serve to protect the chamber and prevent dangerous conditions
caused by major defects.
If one of the over temperature protective devices permanently turns off the chamber, the user cannot
restart the device again. The protective cut-off devices are located internally. Only a service specialist can
replace them. Therefore, please contact an authorized service provider or BINDER Service.
11.2 Overtemperature safety controller class 3.1
The chambers are regularly equipped with an electronic overtemperature safety controller (temperature
safety device class 3.1 according to DIN 12880:2007). If an error occurs, the safety controller performs a
regulatory function.
Please observe the DGUV guidelines 213-850 on safe working in laboratories, issued by the employers’
liability insurance association (for Germany).
The overtemperature safety controller serves to protect the chamber, its environment and the contents
from exceeding the maximum permissible temperature. In the case of an error, it limits the temperature
inside the chamber to the entered safety controller value. This condition (state of alarm) is indicated visu-
ally and additionally with an audible alert if the buzzer is enabled (chap. 15.3). The alarm persists until the
chamber cools down below the configured safety controller value and the alarm is reset on the controller.
Check the setting regularly and adjust it following changes of the temperature set-point or
charge.
The safety controller only activates after the set-point has been reached once.
You can set the safety controller mode to “Limit” or “Offset”.
• Limit: Limit value, absolute maximum permitted temperature value
This setting offers high safety as a defined temperature limit will not be exceeded. It is important to
adapt the safety controller value after each modification of the temperature set-point. Otherwise, the
limit could be too high to ensure efficient protection, or, in the opposite case, it could prevent the con-
troller from reaching an entered set-point outside the limit range.
• Offset: Offset value, maximum overtemperature above any active temperature set point. The resulting
maximum temperature changes internally and automatically with every temperature set-point change.
Example:
Desired temperature value: 37 °C, desired safety controller value: 39 °C.
Possible settings for this example:
Temperature set point Safety controller mode Safety controller value
37 °C
Limit Limit value 39 °C
Offset Offset value 2 °C
Factory setting: Safety controller mode “Offset” with safety controller value 2 °C.
The settings of the safety controller are inactive during sterilization (chap. 23). They become
functional again following abortion of the sterilization and/or the restart of the chamber at the
main power switch.
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