A signalling device emits an alarm in order to warn or alert something or someone. Alarms generated by signalling devices can be either audio or visual, depending on the requirements, applications, or surroundings of the installation site. Signaling devices are typically linked to a control panel that sends out the signal when it is required. Hooters and strobe lights are examples of signalling devices. In general, signalling devices (siren and strobe) are used in tandem because they produce an alarming sound as well as a visual flash/signal.
Signaling devices can be classified according to their type and application. Visual signalling devices, audible signalling devices, and other control signalling devices are examples of signalling devices. The visual signalling devices segment includes beacons and stack lights, whereas the audible signalling devices segment includes bells, hooters, and electronic beeper or buzzer.
Signaling devices are designed to continuously monitor changes in the surrounding parameters and to sound an alarm if any unfavorable changes are detected. Fire alarm systems, mining safety systems, gas warning systems in the oil and gas industry, heavy rainfall warning systems, and earthquake warning systems are the most common types of signaling devices. Depending on the end-user application, signaling devices can be explosion-proof, fire-proof, or water-proof.
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