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9 Alarm Systems
9.1 Operating the Alarm
9.2 Local and Remote
Thermo Fisher Scientific
The alarm system is designed to provide visual and audible warning signals
for both power failure and rise in temperature. The alarm is equipped with a
battery backup.
Default cold and warm alarm values are -40
be adjusted, following the instructions in Section 6.3.
The alarm system is activated only when the key switch is turned to the
Alarm On position. The audible warning signal sounds when there is a
power failure or temperature alarm condition, or when the door is ajar for
more than 3 minutes.
The Mute function (pressing the
warning without turning off the visual indicators.
To turn off and reset flashing visual alarms, press
There is also a ringback function after approximately 6 minutes if any alarm
condition remains active.
Freezer units can have either a factory-installed local alarm or an optional
Alarms
user-installed remote alarm. Operating and testing procedures are the same
for both types of alarm.
The maximum distance between a freezer and a remote alarm depends on
the wire gauge used. Refer to Table 5 below.
Wire Gauge
20
18
16
14
12
Table 5. Wire Gauges and Distance to Remote Alarm
button) allows you to turn off the audio
Total Wire Length (feet)
530
840
1,330
2,120
3,370
Alarm Systems
C and -20
C. These values may
and
simultaneously.
Distance to Alarm 1/2 Wire
Length (feet)
265
420
665
1,060
1,685
Laboratory and Plasma Freezers 13
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