MKF / MKFT (E5) 04/2022 page 83/176
11.4 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 the actual temperature exceeds the nominal temperature by approx. 20 °C, the over temperature protec-
tive 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 Safety controller (over temperature safety device class 2)
The chambers are regularly equipped with an electronic overtemperature safety controller (temperature
safety device class 2 according to DIN 12880:2007). The safety controller is functionally and electrically
independent of the temperature control system and serves to protect the chamber, its environment and the
contents from exceeding the maximum permissible temperature.
With the option over-/under temperature safety device class 2 (chap. 12.3), the safety control-
ler is not used. In this case it must be set to the maximum temperature.
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).
When the entered safety controller set-point is reached, the overtemperature safety controller turns off the
heating, fan, refrigeration system and humidifying system. This condition (state of alarm) is indicated visu-
ally and additionally with an audible alert if the buzzer is enabled (chap. 11.4). The alarm persists until the
chamber cools down below the configured safety controller setpoint and the alarm is reset manually.
Check the setting regularly and adjust it following changes of the set-point or charge.
The safety controller only activates after the set-point has been reached once.
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