Graphic annunciation

Alarms should be displayed on a conventional dedicated window annuciator panel or if control room based on a dedicated CRT display for fire and gas detection systems. Each detector location should be highlighted with indications for trouble, alarm low, and alarm high. Where annuciator panel window alarms the alarm indication lights should be provided with specific labels indicating the exact alarm locations. 

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More and more commonly, fire alarm panel data is transferred to a safety instrumented system (SIS) for graphic annunciation though the SIS human-machine interface (HMI). 

In addition to the abbreviated LCD display on the fire alarm panel, an annunciator should be provided to graphically display facility conditions in all areas. Often this annunciator is an additional panel provided with the fire alarm system, which contains a graphic display or representation of the plant or area being monitored as well as illumination capabilities which identify the status of all monitored plant areas. 

A main control and annunciator panel should be installed when the fire alarm system requires more than a single alarm zone. The panel should be installed in the control room or other continuously staffed location. Separate detection zones should be provided for each distinct fire area and identified by a permanent label. A detailed map of the area should also be provided at the annunciator that identifies which zone relates to which annunciator lamp. Systems with more than ten separate zones should be provided with an electric or electroniczone "mimic" panel showingthe location of all alarms on the graphic display of the platform. Basic arrangements of equipment and system design should be in accordance with NFPA 72. A locked main fire panel and control cabinet should be provided. 

Each annunciator is placed in the control board directly over the instrument or portion of the system on the graphic board with which its signal is associated. 

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