Carel Datalogger Manuel D'utilisation page 20

ALARM Button
ALARM Mode
The instrument can manage two different types of alarms, that is those directly dependent on the temperature
change and those caused by accidental conditions such as prolonged blackouts or damages to the Datalogger
itself. In both cases, the recognition of the alarm condition is followed by the buzzer activation (if previously
enabled), the switching of the alarm relay and the lighting of the red LED coupled with the button
pressure on the button silences the buzzer, releases the relay and displays the informative masks regar-
ding the activated alarms. By moving with the
they are more than one.
• Lack of alarms, normal functioning conditions
If the button is pressed under normal conditions, simultaneously appears the mask:
No Alarm Pending
• Alarms depending on temperature variation
For these alarms the user has the opportunity to select a time delay between the occurrence of the alarm
condition and its notification by means of the procedure that has been previously described (buzzer activa-
tion, relay switching, red LED lighting). The alarms that depend on the temperature variation are:
- Open door (#): if the alarm is being signalled, the door of a cell remains open for a time exceeding the
selected one.
- Short-circuited probe error (Err+): the instrument signals if a probe is short-circuited. The signalling delay
is of one minute not selectable.
- Open probe error (Err-): the instrument signals if a probe is open. The signalling delay is of one minute not selectable.
High and low temperature limits (!): the instrument signals if the temperature of one of the probes is beyond
the selected limits of high or low temperature (after time delay).
The alarms of this type are signalled in the main mask by special characters, here indicated in brackets,
that appear overlapping the field reserved to the temperature (or to the unit of measure) relevant to the
alarm probe. If for a same probe two error conditions occur simultaneously, the symbol "*" appears. Some
examples are further illustrated. The masks relating to these alarms that appear when pressing the
button are:
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Alarm of high temperature measured by the probe 1 (the case of the alarm
HI_Al Probe 1!
of low temperature and of the probe 2 is similar).
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The probe 1 is short-circuited.
Error Probe 1
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The door 1 is open (analogous for the door 2).
Door Open 1
buttons all the present masks are being scrolled, if
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The hour reported in these masks that of the alarm beginning. As long as the alarm condition is present,
the LED coupled with the
To better explain the use of the special characters, below is shown how the main mask appears in the
cases of alarm that can take place with only one probe configurated.
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-18 °C
. A
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-12.5 #
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Err- ROOM1
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+5.0 !
The last one occurs when the limit of high temperature, selected in the mode of "PARAMETER MODIFI-
CATION", is placed , e.g.., at 30°C. Analogous is the case of the low temperature alarm.
• Other alarms
For these alarms, a delay selectable by the user is not provided. They are:
- Blackout: if the parameter "Maximum Time of Blackout" (parameter 13 in hours) is enabled, the duration of
each power failure is evaluated in hours. If it is greater than the selected Maximum Time, the instrument
warns through an alarm according to the previously indicated procedure. The mask indicating the presence
of this alarm is:
- System error: when switching on, in the presence of damages to the Clock chip, a routine of reconstitution
of the Flash pointer is started and on the display the following message will appear:
If the reconstitution has a favourable outcome, only the selected values of the parameters are lost, and so
the instrument will start again with the default values. The user is warned of this by an alarm and the mask:
After stopping the alarm, it will be possible to reset the desired values of the parameters.
button is blinking, whereas when the anomaly cases the LED switches off.
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Normal condition.
ROOM1
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Door 1 open.
ROOM1
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Open probe.
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Alarm of high temperature.
ROOM1
Warn.!Black out!
FLASH DOCTOR...
System failure:
FLASH EPROM
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