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Control, Alarm and Monitoring
Twin Guard Series
-86°C Ultra-Low Freezers
™
Alarm & Safety Features
Abnormal ambient (too high or
too low), or abnormal freezer
Status Alert
High Temperature (+40°C)*
beyond high temp setpoint
Low Temperature (-40°C)*
Power Failure
Control Temperature
Sensor Failure
Auto Return
Door Alarm
*New extended range is important for GxP applications to reduce potential incident event reporting.
The integrated microprocessor control aggregates information from the entire system and compares to normal or setpoint values. Out-of-compliance events are
announced by visual and audible warnings, and remote alarm when connected to an external system.
Events
loading (too much warm
product at one time).
Interior chamber warms
Notification of error on
Interior chamber warms
beyond low temp setpoint
Loss of power
Sensor probe disconnect
short circuit or failure
Touch key is not pressed
Reverts to chamber
for 90 minutes
temperature display
Notification of error on
Door open
Visual
Intermittent tone. Time delay
of 15 minutes after reaching
graphical display
alarm setpoint avoids false
alarms. Intermittent tone.
Intermittent Tone
Solid Tone
Solid tone sounds after
graphical display
2 minutes
All performance attributes are displayed on a large, visually intuitive alpha-
numeric display.
Internal temperature log files are expressed in graphical form over time.
Out-of-compliance events are announced by visual and audible warnings.
Error codes quickly identify problem sources and permit fast diagnosis
and remediation.
Audible
Signal to Alarm Contact
None
None
Yes
Yes
N/A
No
None
No
Yes
9
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