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FP (E1.1) 03/2019 page 56/90
13. Behavior at failures
13.1 Behavior after power failure
Power failure during fixed-value operation (Normal Display): the entered parameters remain saved.
After power return operation continues with the set parameters.
Power failure during program operation: After power return program course continues with the set-
points that have been reached during program operation.
13.2 Alarm messages
Alarm messages, e g. “RANGE ERROR CH1” in case of sensor rupture, are displayed in Display 2 only
in Normal Display.
A buzzer can be activated / inactivated in the user level (chap. 10). It can be reset by pressing the EXIT
button. The alarm text displayed in Normal Display goes off only if the alarm cause does not exist any
longer.
14. Temperature safety devices
14.1 Temperature safety device class 2 (DIN 12880)
The temperature safety device class 2 acc. to DIN 12880:2007 protects the chamber, its environment and
the charging material 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).
In the event of a fault in the temperature controller, the safety device (2) permanently turns off the
chamber. This status is reported visually by the indicator lamp (2a).
Check the operation of the safety device (2) by moving it slowly counter-clockwise until the chamber turns
off. The safety device cut-off is reported visually by the indicator lamp (2a).
Then release again the safety device by pressing the reset button (2b), and turn on the chamber as
described.
Figure 8: Safety thermostat class 2
Function:
The safety device class 2 is functionally and electrically independent of the temperature control device
and turns off the chamber permanently.
If you turn the control knob (2) to its end stop (position 10), the safety device protects the appliance. If
you set it to a temperature a little above the controller’s set-point temperature, it protects the charging
material.
(2)
(2a)
(2b)
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