VD (E2.1) 07/2017 page 51/96
11. Performance in case of failures
11.1 Performance after power failure
Power failure during fixed-value operation (Normal Display):
The entered parameters remain saved. After power returns operation continues with the set parameters.
Power failure during program operation:
After the power returns, program course continues with the set-points that have been reached previously
during program operation.
11.2 Alarm messages
Alarm messages, e g. “RANGE ERROR CH1” in case of sensor rupture, are shown in Display 2 only in
Normal Display.
A buzzer can be activated / deactivated in the user level (chap. 10). It can be reset by pressing the EXIT
button. The alarm text shown in Normal Display goes off only if the cause of the alarm does not exist any
longer.
12. Temperature safety device class 2
The chamber is equipped with a temperature safety device class 2 (temperature limiter) acc. to DIN
12880:2007. The safety device protects the vacuum drying oven, 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).
The temperature safety device only activates after the set-point has been reached once.
In the event of a fault in the temperature controller, the safety device (2) permanently turns off the
vacuum drying oven. 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 it is turned off.
The safety device cut-off is reported visually by the indicator lamp (2a).
Then release the safety device by pressing the reset button (2b), and turn on the VD vacuum drying oven
as described previously.
Figure 10: Temperature safety device class 2
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