![background image](http://html1.mh-extra.com/html/thermofisher-scientific/cryomed-tscm17ea/cryomed-tscm17ea_operating-and-maintenance-instructions-manual_1105580042.webp)
36 | Alarms
Controlled Rate Freezer
Once the Controlled-Rate Freezer returns to Idle mode and
the LN
2
valves are de-energized, the alarm will automatically
clear.
Temperature Limit
If the temperature of the Chamber or Sample probe reaches
the chamber design high or low temperatures (design
temperature limits are factory preset at +55°C and -185°C),
the Controlled-Rate Freezer will generate a Temperature Limit
alarm for the relevant probe according to the general alarm
guidelines.
This is a “self clearing” alarm and will clear once the
temperature in question returns to the designed temperature
limit range. If the alarm resolves within 10 minutes, any active
run or Warming mode operation will continue uninterrupted.
If the temperature of either probe continuously exceeds the
limit temperatures for longer than 10 minutes, any active run
or Warming mode will be terminated. 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.
Temperature Tracking Alarm
If the chamber temperature is higher or lower than the
programmed temperature during an active run by a pre-
determined amount for a pre-determined time period, a
Temperature Tracking Alarm will be generated according to
the general alarm guidelines.
This is a “self clearing” alarm. When the chamber temperature
returns to within the pre-determined range of the
programmed temperature, the alarm will clear.
Power Failure
If AC power to the Controlled-Rate Freezer is interrupted, the
Controlled-Rate Freezer will detect the power failure and alert
the operator that the Controlled-Rate Freezer is under battery
power. The freezer will generate a Power Failure alarm
according to the general alarm guidelines.
Active Run
If an active run is ongoing when the alarm occurs, the run will
continue without temperature control. The fan and heater will
be shut off and the LN
2
valves will remain closed. Once power
is restored, temperature control will resume.
Warming Mode
If the freezer is in Warming mode when the alarm occurs,
Warming mode will be terminated and the freezer will return to
Idle mode on the Home screen.
Idle Mode
During a power failure in Idle mode, Warming mode and
active runs may not be initiated. If the user attempts to initiate
a run or start Warming mode, a dialog will be generated
notifying the user that they are unable to do so.
Figure 90. Power Failure Alarm (Idle Mode)
Warm Complete
Five minutes after the chamber reaches 25°C during a
Warming mode cycle, the freezer will sound a Warm
Complete alarm for 10 seconds.
Note:
This alarm is audible only and does not follow the
general alarm guidelines for the red bell icon display.
After the Warm Complete alarm is sounded, the Chamber
temperature is maintained at 25°C for a period of 30 minutes.
After the 30 minutes expires, the freezer is switched to Idle
Mode and all temperature controls are disabled.
WARNING:
Potential asphyxiation hazard. This
equipment should be located in a well ventilated
room.
CAUTION:
Do not allow the sample probe to
come into contact with the chamber interior
during operation. This could cause a displayed
sample probe temperature shift.