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 ?
Table 23: World Long Term Projections for Fire Alarm Devices by Product Segment- Annunciators, Notification Devices, and Manual Pull Stations Independently Analyzed with Annual Sales Figures in US$ Million for Years 2011 through 2015 (includes corresponding Graph/Chart) II-52
Table 32: World 15-Year Perspective for Annunciators by
Table 27: World 11-Year Perspective for Annunciators by
The components include various annunciators, fillable shapes (with a selection of panels and bezels), seven segment displays, pipes, valves, tanks, pumps, meters, switches, buttons, sliders, scales, and strip charts.
The Fire Systems Catalog highlights fire alarm control panels and peripherals, including annunciators, detectors, pull stations, horns, strobes, and speakers.
The state-of-the-art GPS-based system also includes in-vehicle voice annunciators and signs, automatic passenger counters and 15 passenger information devices displaying up-to-date-bus status.
Its services include security technologies, computer-aided dispatch and automatic vehicle locator systems, wireless communications, in-vehicle annunciators, revenue and fare collection systems, network infrastructure and other transportation electrical and electronic subsystems.
The unit is user friendly and easy to install, requiring only four external annunciators and no switches or resolvers.
NOTIFIER also manufactures peripheral devices, including manual pull stations, intelligent and conventional detection products, signaling devices, high capacity digital communicators, and annunciators.
An alert was declared at Unit 3 of the Palo Verde Nuclear Generating Station on May 4, 1992, due to the loss of control room annunciators and supporting computers which are part of the plant monitoring system.
This suite of JavaBeans will create meters, strip charts, annunciators, active input devices (buttons, knobs, sliders), bar charts, seven-segment displays, and much more.
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.