KB (E4 + E6) 02/2017 page 103/148
17. Temperature safety devices
17.1 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 provid-
er or BINDER Service.
17.2 Overtemperature safety controller (temperature safety device class 3.1)
The chamber is regularly equipped with an electronic overtemperature safety controller (temperature
safety device class 3.1 according to DIN 12880:2007).
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.
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).
Set the safety controller set point by approx. 2 °C up to 5 °C above the desired temperature set point.
Recommended setting: Set-point type “Offset” with safety controller set-point 2 °C (factory setting).
The safety controller is functionally and electrically independent of the temperature control system. If an
error occurs, it performs a regulatory function.
Check the setting regularly and adjust it following changes of the set-point or charge.
17.2.1 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
controller 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.
Example: Desired temperature value: 40 °C, desired safety controller value: 45 °C.
Possible settings:
Temperature set point Safety controller mode Safety controller set-point
40 °C
Limit (absolute) 45 °C
Offset (relative) 5 °C
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