Binder KBF P 240-UL, Translation Of Original Operation Manual

Page: 97 / 189

KBF P + KBF LQC + KBWF (E6) 11/2016 page 97/189
13. Temperature safety devices
13.1 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 permanent-
ly 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.
13.2 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. 13.3), the safety controller is not used.
It must be set to the maximum limit value (70 °C / 158 °F ).
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 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. 12.5). 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.
The safety controller only activates after the set-point has been reached once.
13.2.1 Safety controller modes
You can select between “Limit (absolute)” and “Offset (relative)” safety controller mode
•
Limit: 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 set-point 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: Maximum overtemperature above any active temperature set point. The maximum tempera-
ture changes internally and automatically with every set-point change.
This setting is recommended for program operation. It is important to check the safety controller set-
point and safety controller mode occasionally, as it does not offer a fix, independent limit temperature
value, which would never be exceeded.