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FDL (E2.1) 02/2019 page 44/76
11. Behavior in case of failures
11.1 Behavior after a power failure
Power failure during fixed-value operation (Normal Display): the entered parameters remain saved.
After the power returns, indicator light “AIR” (3) is lit, indicating that the heating has not yet been released
by the air flow monitoring. As an additional indication there is an acoustical signal which can be reset on
the controller. Press pushbutton “START” (4) to start prepurge. After completing prepurge and release of
the heating, operation continues with the set parameters. Now you can reset the visual indication “RESET
ALARM” on the controller.
Power failure during program operation: After the power returns, indicator light “AIR” (3) is lit, indicating
that the heating has not yet been released by the air flow monitoring. As an additional indication there is
an acoustical signal which can be reset on the controller. Program course continues with the set-points
that have been reached previously during program operation. Press pushbutton “START” (4) to start pre-
purge. After completing prepurge and release of the heating, the set-points are equilibrated again. Now
you can reset the visual indication “RESET ALARM” on the controller.
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.
The message „RESET ALARM“ appears when the heating has not yet been released by the air flow moni-
toring.
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. Safety devices
12.1 Temperature safety device class 2
The temperature safety device class 2 (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 cham-
ber. Only the fan continues running for safety reasons. This status is reported visually by the indicator
lamp (2a) and acoustically by the buzzer.
The operation of the safety device (2) is checked by moving it slowly counter-clockwise until it is turned
off. The safety device cut-off is reported visually by the indicator lamp (2a) and acoustically by the buzzer.
Then release the safety device by pressing the reset button (2b) and turn on the chamber is as described
previously.
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