Identifies which alarm occurred first in a series of failures, aiding in root-cause analysis.
An operator pushes an "ACK" button to silence the horn, while the light changes from flashing to solid-on. Reset: Once the fault is cleared, the light turns off. 3. Key Features & Functions annunciator
Standardized logic (like ISA-18.1-1979) defines how the light flashes and how the buzzer behaves. Identifies which alarm occurred first in a series
A field contact opens or closes, sending a signal to the annunciator. or loss of flow.
Annunciators monitor field sensors (switches) that detect changes such as high temperature, low pressure, or loss of flow.