annunciator

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annunciator

[ə′nən·sē·ād·ər]
(engineering)
A signaling apparatus which operates electromagnetically and serves to indicate visually, or visually and audibly, whether a current is flowing, has flowed, or has changed direction of flow in one or more circuits.

annunciator

1. A signaling device, usually electrically operated, that emits an audible signal and/or a visual indication under selected circumstances; for example, it may sound an alarm in the case of fire or unauthorized entry.

annunciator

annunciatorclick for a larger image
Indicator flag in a gyrocompass that alternates between a dot and a cross and does not settle on either when AC (alternating current) supply is on. If the compass drifts, then either the dot or the cross will be visible, and the compass will not annunciate.
References in periodicals archive ?
The new unit maintains a number of features from the current DD-40NTS, such as a "universal" power supply capable of operation on either dc or ignition input voltage, as well as the ability to operate the annunciator logic module for an extended period on internal backup battery power.
The system installation requirements include available physical space for mounting, a Mark III with BCD port or similar annunciator, a power supply and a telephone connection or cellular phone with accessory connection capabilities.
Options include remote annunciators, contact-by-zone features, and printer interface module.
The Fire Systems Catalog highlights fire alarm control panels and peripherals, including annunciators, detectors, pull stations, horns, strobes, and speakers.
Other options available include single- or multichannel voice; firefighter's telephone; LED-, LCD-, or PC-based graphic annunciators; fire or integration networking; and advanced detection products for challenging environments.
NOTIFIER also manufactures peripheral devices, including manual pull stations, intelligent and conventional detection products, signaling devices, high capacity digital communicators, and annunciators. Intelligent products include advanced detection capabilities that reach into special applications such as early warning and detect ion products suitable for dirty environments.
It includes an 80-character LCD display with backlighting, real-time clock/calendar, 1,000-event history file, support for 32 annunciators, and an RS-232 interface for printing capabilities.
The TTD annunciator is a fully-configurable fault annunciator that includes alarm and shutdown control.