![]() The flashing light is common to all individual alarm points and interrupts the circuit to the visual indicator when that point enters the alert condition. The audible signal can be a horn, a bell or a bell. The visual indicator is usually a plate with the backlight mark engraved with an inscription to identify the variable and the abnormal condition, but it can also be a bull’s-eye with an identification plate. In the alert state, the annunciator turns on the visual indicator of the particular alarm point, the audible signal and the flashing light for the system. ![]() In electrical annunciator systems, it is usually a switch contact that closes (creates) or opens (breaks) the electrical circuit to the logic module and thereby initiates the alarm condition. The problem contact is an alarm switch that monitors a particular process variable and is activated when the variable exceeds the preset limits. In normal operation, the annunciator system and the individual alarm points are inactive. The individual alarm points are operated from a common power source and share a number of annunciator system components, including an audible signal generator (horn), a flashing light and confirmation and test buttons. Each alarm circuit includes a problematic contact (alarm switch), a logic module and a visual indicator. The annunciator system consists of multiple alarm points.
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