Thermo Scientific 7450, Operating And Maintenance Manual

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The controller will detect a power failure and alert the operator under the
following conditions:
1. Power failure less than 10 seconds in duration
Continue profile run without interruption or alarm after power is
restored.
2. Power failure more than 10 seconds in duration
Flash Alarm LED and sound audible alarm at 25% On duty cycle with
2 second period
Show duration of failure and “Power Failure Alarm” on second, third
and fourth line display) display line (alternated with normal fourth line
display)
Mark strip chart recorder and thermal printer (re-print temperature
scale on thermal printer)
Continue profile run without interruption.
A single depression of the Silence key will clear the audible alarm. A
second depression of the Silence key will clear the Alarm LED and the
messages on the second, third and fourth display lines.
Five minutes after the End profile step is reached, the controller will sound
the Run Complete alarm:
• Flash Alarm LED and audible tone at a 25% On duty cycle (2 second
period)
• Show “End of run” on the fourth line of the display.
The controller will maintain the temperature of the final step in the profile
run until the run is stopped by the operator pressing the Back key.
Caution If performing successive runs, dry the gaskets and heat breaks
between each run. ▲
7007452 CryoMed Freezer 2-17 Thermo Scientific
Section 2
Set-Up and Operation
Power Failure
Run Complete