Alarm Button; Alarm Mode - Carel 2N Manuel D'utilisation

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
informative masks regarding the activated alarms. By moving with the
if they are more than one.
• Lack of alarms, normal functioning conditions
If the button is pressed under normal conditions, simultaneously appears the mask:
• 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
notifi cation by means of the procedure that has been previously described (buzzer activation, 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 fi eld 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
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HI_Al Probe
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Error Probe
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Door Open
The hour reported in these masks that of the alarm beginning. As long as the alarm condition is present, the LED coupled
with the button is blinking, whereas when the anomaly cases the LED switches off. 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
confi gurated.
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-18 °C ROOM1
. A pressure on the button
No Alarm Pending
button are:
Alarm of high temperature measured by the probe 1 (the case of the alarm of low
1!
temperature and of the probe 2 is similar).
1 The probe 1 is short-circuited.
The door 1 is open (analogous for the door 2).
1
Normal condition.
silences the buzzer, releases the relay and displays the
buttons all the present masks are being scrolled,