Fisher Scientific Isotemp FBG Serie Manuel D'utilisation page 27

T1 Temperature read by the probe
T2 Calibrated temperature
A Calibration offset
min, Field of measurement
max
Backup battery
The controller can manage an external backup battery.
This ensures some minimum controller functions when
no power is available, and signals anomalous operation
in the event of a blackout. During normal operation, the
controller recharges the battery and performs a test every
24 hours to verify correct operation. The test can also be
run manually by pressing a button or via the direct function.
Activation of the backup battery can be disabled when the
unit is in storage using the boF parameter turned ON within
the direct functions. The following battery is supplied with
the unit: lead-acid VRLA, 6V, maximum discharge current
200 mA. Typical charging current is
30 mA (maximum 50 mA).
CAUTION: A 500 mAT slow-blow fuse (is
included) in series with the battery.
Table 12. The table shows the operation of the user
interface and the various devices in the event of a power
failure:
Function Behaviour with power failure
Display The digits go off and only the decimal
point remains flashing. Pressing PRG
reactivates the standard display for 5
seconds.
Button PRG button only
backlighting (if
present)
Icons Service icon only flashing
Buzzer Will be on during alarming and will
silenced by pushing the program
icon, after 30 minutes the buzzer will
reactivate.
Relays All disabled
Alarms The power failure is signalled by alarm
BLC, visible only by pressing PRG
Notice: In the event of temperature alarms, these are
signaled as normal, even in the event of a power failure.
Temperature monitoring
The controller can record the minimum value rL and
maximum value rH read by the product probe for pharmacy
units and the control probe for the standard units. The
monitoring session can be reset at any time, after which
the new maximum and minimum values are logged.
See the "Action in Direct Access Mode" for more details.
Alarms and Signals
Signals
Signals are messages shown on the display to notify the
user of the control procedures in progress (e.g. defrost) or
to confirm keypad input.
Table 13. Signals
Display code Description
dEF Defrost running
Loc Display locked
Off Switch OFF
On Switch ON
Types of alarms
The controller can display two types of malfunctions:
• Warning, when this type of error occurs, the alarm code
is shown on the display, alternating with the main value,
and the "Service" icon
however the buzzer does not sound, no relay is activated;
some signals fall under this category, e.g. defrost ended
due to maximum time, anomalous temperature alarms,
configuration errors.
• Alarms, when this type of error occurs, the alarm code
is shown on the display, alternating with the main value,
and the "Service" icon
and the relay is activated; this category includes alarms
for which with the relay is configured as an alarm, probe
errors, temperature alarms, frost protection, etc.
Both warnings and alarms can be reset automatically,
manually or semi-automatically:
• Automatic, when the cause is no longer present, the
alarm also ceases;
is shown on the display,
comes on, the buzzer fl ashes
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