vwr.com I Instruction manual VWR
®
ULT Freezer 352/528 Eco Premium 02/2022
Page 51/86
14.3 Setting the temperature tolerance range
The temperature range is defined symmetrically around the setpoint. If the actual temperature value lies
within this tolerance range and subsequently leaves and the tolerance range, tolerance range alarm is
triggered after the set adjustable delay time (chap. 14.2)
Path:
Normal display Settings Various Temperature range
Press the
OK button
to enable the setting.
Setting the temperature tolerance range
The current setting flashes. Enter the desired temperature range with
the
arrow buttons
. Entry range: 1,0 °C up to 10,0 °C. Factory set-
ting: +/- 5 K
Confirm the entry with the
OK button
.
Temperature range
With the
arrow-up button
you can go back to the tolerance range alarm delay setting.
With the
arrow-down button
you can now change to the service setpoint setting (chap. 19.1).
With the
Back button
you can go back to the “
Various
” submenu and, repeatedly pressing it, to
Normal
display
.
15. Alarm functions
15.1 Alarm messages
WARNING: If customer should use a chamber running in non-supervised continuous opera-
tion, we strongly recommend in case of inclusion of irrecoverable specimen or samples to
split such specimen or samples and store them in at least two chambers, if this is feasible.
In the event of equipment failures, when the temperature deviates from the set tolerance range limits, optical
and, if activated, acoustic alarm messages are given out via the controller. A zero-voltage relay alarm output
(chap. 15.5) in the rear connection panel (M) permits transmission of the alarm e.g., to a central monitoring
system.
The alarm messages door open and leaving the tolerance range are emitted after a configurable delay
(chap. 14), the others immediately when the fault occurs. The tolerance range alarm is suppressed after
opening the chamber door or turning on the freezer until the setpoint is reached and then for the selected
delay time.
In Normal display a text message indicates the alarm cause. The “collective alarm” icon flashes.
If the audible arm is activated, the buzzer sounds.
If more than one alarm signal is sent simultaneously, they are displayed in a cycle.
Press the
OK button
to confirm the alarm and mute the buzzer. If the alarm cause is still valid, the “collective
alarm” icon is lit.
Alarm indication (example: safety controller alarm)
Safety controller