# Alarms and warnings handling

Boomerang monitors measuring point readings.

When a value crosses a limit, the system raises a **warning** or an **alarm**.

### Key concepts

* Limits define when alarms and warnings trigger.
  * See [Alarm limits](https://help.boomerang3.com/boomerang-3-user-manual/dashboard/alarms_and_warnings/alarm-limits).
* Alarm Filter reduces noise by requiring consecutive out-of-limit readings.
  * See [Alarm filter](https://help.boomerang3.com/boomerang-3-user-manual/dashboard/alarms_and_warnings/alarm-filter).

In this section, “alarm” means alarms and warnings unless stated otherwise.

{% stepper %}
{% step %}

### Alarm is triggered

An alarm becomes **active** when limit and filter conditions are met.

Active alarms are shown in the UI.

See [Alarm presentation](https://help.boomerang3.com/boomerang-3-user-manual/dashboard/alarms_and_warnings/alarm-presentation).
{% endstep %}

{% step %}

### Alarm is delivered

The system notifies one or more users using configured channels.

See [Alarm delivery](https://help.boomerang3.com/boomerang-3-user-manual/dashboard/alarms_and_warnings/alarm-delivery).
{% endstep %}

{% step %}

### Investigate and correct

Use the alarm list and object view to identify the cause.

Typical outcomes:

* the measured value returns to the normal range
* communication with the measuring point is restored

{% hint style="info" %}
Also do preventive actions to avoid recurring alarms.
{% endhint %}
{% endstep %}

{% step %}

### Sign (close) the alarm

Alarms remain active until a user signs them.

See [Alarm signing](https://help.boomerang3.com/boomerang-3-user-manual/dashboard/alarms_and_warnings/alarm-signing).

Warnings close automatically when the warning condition disappears.

{% hint style="danger" %}
If you sign while the condition still exists, the alarm can trigger again.
{% endhint %}
{% endstep %}
{% endstepper %}

### Where to look next

* [Alarm types](https://help.boomerang3.com/boomerang-3-user-manual/dashboard/alarms_and_warnings/alarm-types)
* Object view: [Activity log tab](https://help.boomerang3.com/boomerang-3-user-manual/dashboard/object_view/detailed-object-view/activity-log-tab)