KBF + KMF (E6) 07/2017
page 78/155
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 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).
With
safety device class 3.1
a maximum value for the temperature is set that the chamber will not ex-
ceed due to the regulatory function of the safety device class 3.1. This protection against excessively high
temperatures 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: 70 °C /
158 °F
, KMF: 100 °C /
212 °F
).
(9)
(8)
Excess
temperature
Set-point
Insufficient
temperature
Figure 16: Temperature safety device class 3.3
Summary of Contents for KBF 115
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