KBF / KBF-UL + KMF (E6) 09/2021 page 80/160
11.5 Activating / deactivating the audible alarm (alarm buzzer)
Path: Main menu > Settings > Chamber
“Chamber” submenu (example).
In the field “Audible alarm” select the desired setting
“off” or “on” and press the Confirm icon.
12. Temperature safety devices
12.1 Over temperature protective device (class 1)
The chamber is equipped with an internal temperature safety device, class 1 acc. to DIN 12880:2007. It
serves to protect the chamber and prevents dangerous conditions caused by major defects.
If a temperature of approx. 110 °C / 230 °F is reached, the over temperature protective device permanently
turns off the chamber. The user cannot restart the device again. The protective cut-off device is located
internally. Only a service specialist can replace it. Therefore, please contact an authorized service provider
or BINDER Service.
12.2 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). The safety controller is functionally and electrically
independent of the temperature control system. If an error occurs, it performs a regulatory function.
With option temperature safety device class 3.3 (chap. 12.3), the safety controller is not
used. It must be set to the maximum limit value (KBF / KBF-UL: 70 °C / 158 °F, KMF: 100 °C
/ 212 °F).
Please observe the regulations applicable to your country (for Germany: DGUV guidelines 213-850 on safe
working in laboratories, issued by the employers’ liability insurance association).
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 set-point. This condition (state of alarm) is indicated visually
and additionally with an audible alert if the buzzer is enabled (chap. 11.5). The alarm persists until the
chamber cools down below the configured safety controller setpoint.
Check the setting regularly and adjust it following changes of the set-point or charge.
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