Types of Alarms

Different Types of Alarms in distributed control systems (DCS) or Emergency Shutdown systems (ESD) are as foolows.

Types of Alarms

Type 1

Alarm: Equipment status alarm. Pump is on or off, or motor is running or stopped.

Type 2

Alarm: Abnormal measurement alarm. Measurement is outside of specified limits.

Type 3

Alarm: An alarm switch without its own sensor. When it is not necessary to know the actual value of the process variable, only whether it is above (or below) a specified limit.

Type 4

Alarm: An alarm switch with its own sensor. This serves as a backup in case the regular sensor fails.

Type 5

Alarm: Automatic Shutdown or Startup System.

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