Operation
Thermo Scientific Cryopgenic Storage Freezers
Installation and Operation Manual
13
6.3.4 Alarm Reset & Status
Lights
The alarm reset feature ensures user acknowledgment of the occurrence of
certain alarm conditions. This provides greater monitoring power by
alerting the user if an alarm condition has occurred during periods when the
freezer must be left unattended. The alarm conditions incorporating this
feature are:
•
Temperature Failure-Warm Alarm
•
Temperature Failure-Cold Alarm
•
Voltage Low
•
Power Failure
•
Life-Guard Alert
•
Extreme Ambient Alert
During any of these alarm conditions, the corresponding indicator will flash
quickly, approximately 90 times per minute. If the alarm condition then
disappears, the flash rate will decrease to approximately 15 times per
minute. The indicator will then remain flashing at this rate, unless the
condition reoccurs, until the Alarm Reset button is pressed. Once this has
occurred, the indicator will no longer be lit.
In the case of TEMPERATURE FAILURE-WARM ALARM and
TEMPERATURE FAILURE-COLD ALARM, if these conditions have
occurred but are now within the given limits, the two indicators will
alternately flash (180° out of phase). In addition, for these two temperatures
failures, the highest temperature and lowest temperature, respectively,
during the error condition will be saved. Prior to the temperature failure
being reset, the temperature extreme may be viewed by pressing the Cabinet
Temperature pad in conjunction with either the Warm Alarm Setpoint pad
or the Cold Alarm Setpoint pad.
Note:
Once the Alarm Reset button is depressed, the excursion temperature
value is reset to the current cabinet temperature.
