34 | Alarms
Controlled Rate Freezer
Alarms
General Alarm Guidelines
During an active run, all alarms will display a red bell
icon on top of the screen. Outside of an active run,
only the Power Failure alarm will display the red bell
icon.
Alarms are silenced by pressing the alarm icon. Once
pressed, the alarm icon will change to a bell icon with
a slash through it.
•
All alarms that display the red bell icon will trigger the
remote alarm signal. The remote alarm is only cleared by
recovering from the alarm. Silencing the alarm does not
clear the remote alarm.
•
All alarms that display the red bell icon will also raise the
alarm buzzer.
•
In an active run, alarm icons will be displayed on the run
chart at the time they occurred. All alarms are also logged
in the Alarm Detail view.
Figure 85. Alarm Detail Screen
Note:
Only Power Failure alarms will display the red bell icon,
trigger the remote alarm, and activate the buzzer in Idle mode.
All other alarms will only do so during Warming mode or an
active run.
Chamber Thermocouple
Failure
If the chamber thermocouple cannot be detected or reads
erroneous values (>75°C), an alarm will be triggered
according to the general alarm guidelines.
A chamber thermocouple failure is considered a non-clearing
alarm and will end Warming mode or an active run. Once the
failure is detected, a dialog will prompt the user to
acknowledge the alarm. Upon acknowledgment, the
Controlled-Rate Freezer will return to the Home screen and
enter Idle mode. If the Controlled-Rate Freezer was in an
active run, a RUN file will be written as if the run was canceled
early.
Figure 86. Active Run Cancellation
•
The Chamber temperature display on the Home screen
shows “…” when a Chamber Thermocouple Failure alarm
is active.
Figure 87. Chamber Temperature Display (Home
Screen)
Alarm Icons
Alarms
Temperature limit,
Temperature tracking
Power Failure
Thermocouple probe failure
LN
2
Malfunction,
Heater Malfunction
