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Concept

Concept


Products: Enterprise Central, Enterprise Server, Esmi Sense FDP
Functionalities: Alarms
12/2/2024

Out of Reference Range Alarms

​The out of reference range alarm monitors variable movements comparing to a reference variable. By setting an upper deviation limit and lower deviation limit, you configure the tolerance the monitored variable can vary from the reference variable before the alarm is triggered. The upper alarm limit of the monitored variable is equal to the reference point current value plus the upper deviation limit. The lower alarm limit of the monitored variable is equal to the reference point current value minus the lower deviation limit.

Note:

  • An out of range alarm with upper deviation limit, lower deviation limit, and deadband set to zero must meticulously follow the reference variable to not trigger the alarm.

 
action_zoom_plus_stroke Out of reference alarm triggers an alarm when the monitored variable goes outside the upper or lower deviation limit of the reference variable.
Figure: Out of reference alarm triggers an alarm when the monitored variable goes outside the upper or lower deviation limit of the reference variable.

For example, you have a reference variable that is designed to follow the optimal room temperature in a office. By connecting the reference variable and the variable from a thermistor, placed in the office, to an out of reference range alarm, you can set up the alarm to trigger when the temperature differs more than 5 °C (41°F) from the reference variable.

You can configure out of reference range alarms using shunt variable, time delay, and deadband. For more information, see Alarm Functions .

See Also

  • Alarm Types
  • Alarms Overview
  • Alarm Functions
  • Out of Reference Range Alarm Properties – Basic Tab
  • Creating an Out of Reference Range Alarm