Alarm limits

Understand warning vs alarm limits and how they behave.

The alarm limits may be defined as warnings or alarms.

Alarm limits define when a measuring point reading becomes a warning or an alarm.

An example of a graph with limits is shown below.

See also: Graph tab.

Alarm and warning limits on a graph

Warning vs alarm

• Warning

  • Indicates values outside normal range, but still acceptable.

  • Closes automatically when readings return within limits.

  • Usually does not require immediate intervention.

• Alarm

  • Indicates values outside allowed range.

  • Requires immediate attention.

  • Remains active until signed.

Both warnings and alarms use Alarm Filter to require consecutive out-of-limit readings.

Time-of-day schedules

Limits can be valid only during specific times of day.

Use this to ignore expected deviations (for example, defrost cycles).