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Using the Pre Alarms gives the user ample warning of a possible breach of real alarm levels, so
necessary measures can be taken to prevent such a breach.
Simply select the check box for the type of alarm you wish to be notified. You can select all
alarms too. Enter the alarm value in the text box.
Figure 32:
OM-DAQLINK
Alarm Setup tab
Alarm Delay and Pre-alarm Delay
The time until the alarm (or pre-alarm) is activated. You may not want to have the alarm sound
immediately after the alarm level is breached as you are only interested in a condition where the
alarm level lasted a certain amount of time.
For example, if monitoring change of temperature in a freezer, you would only be interested in a
High alarm which lasted more than one minute as anything else could just be caused by the
freezer door opening for a few seconds, as opposed to a power failure leading to rise in
temperature.
Alarm Duration
The duration of the alarm that is set off by one or more sensors breaching the alarm level.
