KBF / KBF-UL + KMF (E6) 09/2021 page 83/160
12.3 Temperature safety device class 3.3 (option)
With the option over/under temperature protective device (temperature safety device class 3.3 acc. to DIN
12880:2007) the chamber is equipped with two additional safety devices (class 3.1 and class 3.2). The
combination of the safety devices is regarded as a safety device class 3.3.
The temperature safety device, class 3.3, serves to protect the constant climate chamber, its environment
and the contents from exceeding the maximum permissible 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).
With safety device class 3.1 a maximum value for the temperature is set that the chamber will not exceed
due to the regulatory function of the safety device class 3.1. This protection against excessively high tem-
peratures can, for example, serve to protect the constant climate chamber, its environment and the material
under treatment from excess temperatures.
With safety device class 3.2 a minimum value for the temperature is set that the chamber will not fall
below due to the regulatory function of the safety device class 3.2. This protection against excessively low
temperatures can, for example, serve to protect sensitive loads from under cooling.
Both safety devices are functionally and electrically independent of the temperature control system. If an
error occurs, they perform regulatory function.
Safety devices class 3.1 (8) and class 3.2 (9) are located in the left lateral control panel.
With option temperature safety device class 3.3, the safety controller (chap. 12.2) must be
set to the maximum limit value (KBF / KBF-UL: 70 °C / 158 °F, KMF: 100 °C / 212 °F).
Excess
temperature
Set-point
Insufficient
temperature
Figure 16: Temperature safety device class 3.3
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