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Fire alarm bell. Fire alarm bells are divided into two categories: vibrating, and single-stroke. On a vibrating bell, the bell will ring continuously until the power is cut off. When power is supplied to a single-stroke bell, the bell will ring once and then stop. It will not ring again until power is turned off and on again.
Early devices were based on an electromechanical system identical to an electric bell without the metal gong. Similarly, a relay may be connected to interrupt its own actuating current, causing the contacts to buzz (the contacts buzz at line frequency if powered by alternating current) Often these units were anchored to a wall or ceiling to use it as a sounding board.
A break-in and cutting wires would cause an alarm to sound. The device operated on a 12-volt battery and included extra loud "B" bell, heavy-duty weather-resistant cabinet with built-in tamper resistant circuit, 125' of double stranded wire, six sets of magnetic switches, two keys, panic button, indoor "ON-OFF" control, and warning decals.
A Simplex-brand fire alarm bell. A fire alarm notification appliance is an active fire protection component of a fire alarm system.A notification appliance may use audible, visible, or other stimuli to alert the occupants of a fire or other emergency condition requiring action.
Bell Tone support (Voice Sounders only) Signal 0 (Find Device) Intermittent This is a test message, no action is required. (female voice) ×: Signal 1 (Alert Signal) Intermittent An incident has been reported in the building, please await further instructions. (female voice) Signal 2 (Fire Evacuation) Alternating This is a fire alarm!
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Coded fire alarm pull station below a 10-inch (25 cm) bell. Magnetic smoke door holders and retainers are wall-mounted solenoids or electromagnets controlled by a fire alarm system or detection component that magnetically secures spring-loaded self-closing smoke-tight doors in the open position.
The word alarm comes from the Old French a l'arme meaning "to the arms", or "to the weapons", telling armed men to pick up their weapons and get ready for action because an enemy may have suddenly appeared. [1] The word alarum is an archaic form of alarm. It was sometimes used as a call to arms in the stage directions of Elizabethan dramas. [2]