vwr.com I Instruction manual VWR
®
ULT Freezer 352/528 Eco Premium 02/2022
Page 45/86
Regularly check the settings of the safety controller mode and value.
Set the safety controller value by approx. 15 °C above the desired temperature set-point.
12.3 Message and measures in the state of alarm
The state of alarm is indicated visually in Normal display. If the buzzer is enabled (chap. 15.3) there is an
additional audible alert. A text message indicates the alarm cause. The “collective alarm” icon is lit. If the
audible arm is activated, the buzzer sounds. Press the
OK button
to mute the buzzer.
The alarm message “Safety controller” and the “Collective alarm” icon are displayed on the controller until
you press the
OK button
on the controller
and
the inner chamber temperature has cooled down below the
safety controller value.
•
If the inner chamber temperature has already cooled down below the safety controller value when press-
ing the
OK button
, the alarm message “Safety controller” and the “Collective alarm” icon are reset
together with the buzzer.
•
If the state of alarm is still active when pressing the
OK button
, i.e. the inner chamber temperature is
still above the safety controller value, first only the buzzer is reset. The alarm message “Safety controller”
and the “Collective alarm” icon will disappear as soon as the inner chamber temperature falls below the
safety controller value.
Normal display showing safety controller alarm (sample value)
Safety controller
Note:
When the safety controller had been activated you should disconnect the chamber from the power supply
and have an expert examine and rectify the cause of the fault.
12.4 Function check
Check the safety controller at appropriate intervals for its functionality. It is recommended that the author-
ized operating personnel should perform such a check, e.g., before starting a longer work procedure.
