Binder KB 23, Operating Manual

Page: 58 / 87

KB 23 / KB 23-UL (E3.1) 02/2019 page 58/87
13. Performance in case of failures
13.1 Performance after a power failure
Power failure during fixed-value operation (Normal Display):
The entered parameters remain saved. After power returns, operation continues with the set parameters.
Power failure during program operation:
After power returns, program course continues with the set-points that have been reached previously
during program operation.
13.2 Alarm messages
Alarm messages, e g. “TEMP. LIMIT” when exceeding the tolerance limit, are shown in Display 2 only in
Normal Display.
A buzzer can be activated / deactivated in the user level (chap. 10). It can be reset by pressing the EXIT
button. The alarm text shown in Normal Display goes off only if the cause of the alarm does not exist any
longer.
14. Temperature safety devices
14.1 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 about 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.
14.2 Safety controller (temperature safety device class 3.1)
The chamber is equipped with an electronic safety controller (over temperature safety device class 3.1
acc. to DIN 12880:2007). This second, electrically independent temperature controller takes over at a
selectable set point in case of a faulty condition. It serves to protect the charging material against
extremely high temperatures.
The safety controller serves to protect the chamber, its environment and the material under treatment
from excess temperatures. In case of error the temperature of the inner chamber will be limited to the set
value. Please observe the DGUV guidelines 213-850 on safe working in laboratories (formerly BGI/GUV-I
850-0, BGR/GUV-R 120 or ZH 1/119, issued by the employers’ liability insurance association) (for
Germany).
The message “TEMP. LIMIT” on the controller Display 2 indicates safety controller activity. If the buzzer
has been activated in the User Level (chap. 10), there is an audible alert. The safety controller controls the
chamber to the entered safety controller set-point until the temperature inside the chamber returns below
this temperature and until you then reset the alarm message with the EXIT button.
The safety controller set-point type and set-point can be set in the user level (chap. 10) of the program
controller.