BINDER KT 53 - Manual (Page 102)

KT (E6) 09/2013 Page 102/135
17. Temperature safety devices
17.1 Overtemperature protective device (class 1)
The refrigerated incubator is equipped with an internal temperature safety device, class 1 acc. to DIN
12880. It serves to protect the unit 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 unit. 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.
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).
The overtemperature safety controller serves to protect the refrigerated incubator, 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 guideline BGI/GUV-I 850-0 on safe working in laboratories (formerly BGR/GUV-R 120
or ZH 1/119 laboratory guidelines 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
Example:
Temperature set point 40 °C
Safety controller set-point 45 °C
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
temperature changes internally and automatically with every set-point change.
Example:
Temperature set point 40 °C
Safety controller set-point 5 °C
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.