9
Control, Alarm and Monitoring

Twin Guard Series™ -86°C Ultra-Low Freezers

Alarm & Safety Features Events Visual Audible Signal to Alarm Contact
Status Alert
Abnormal ambient (too high or
too low), or abnormal freezer
loading (too much warm
product at one time).
Notication of error on
graphical display
None None
High Temperature (+40°C)* Interior chamber warms
beyond high temp setpoint Intermittent tone. Time delay
of 15 minutes after reaching
alarm setpoint avoids false
alarms. Intermittent tone.
Yes
Low Temperature (-40°C)* Interior chamber warms
beyond low temp setpoint Yes
Power Failure Loss of power Intermittent Tone N/A
Control Temperature
Sensor Failure
Sensor probe disconnect
short circuit or failure Solid Tone No
Auto Return Touch key is not pressed
for 90 minutes
Reverts to chamber
temperature display None No
Door Alarm Door open Notication of error on
graphical display
Solid tone sounds after
2 minutes Yes
*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.
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.