Addressable Fire Alarms

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Addressable Fire Alarm Systems

In larger, more complex buildings, Addressable fire alarm systems tend to be used. These systems offer the benefits of faster and more exact identification of the location of a fire and easier maintenance. Addressable systems also allow a single pair of wires to be used to connect a large number of devices to the system, providing cost savings in the wiring of large systems.

The wiring is looped, and connects to the control panel at each end. All detectors, call points, sounders and interface modules are wired directly to the loop, each having its own address. The control panel communicates with each device on the loop, and if a warning or fault condition is signalled, or if communications are lost with a detector, the alarm is triggered. The loop can be powered from each end so that if the loop is broken at any point, no devices are lost.

Different types of fire alarm detection devices:

Smoke Detectors
Optical smoke Detectors:
In some optical smoke detectors use a light beam which when blocked by smoke activate the alarm In others it is triggered by light scatter caused by the smoke. These are slightly less sensitive.
Ionisation Smoke Detectors Detectors:
Ionization detectors have an ionization chamber and a source of ionizing radiation, this ionises the air in the detector. When smoke enters the ionization chamber, the smoke particles neutralise the ionised air and triggers the alarm. These detectors are very sensitive and when choosing a detector the building environment most be taken into consideration.

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Heat detectors
Rate of rise heat Detectors.
Rate-of-Rise (ROR) heat detectors operate by detecting a rapid rise in temperature of 6.7° to 8.3°C increase per minute, irrespective of the starting temperature. When this rate is exceeded the alarm is activated..

Fixed heat detectors
This is the most common type of heat detector. Fixed temperature detectors operate when the heat sensitive eutectic alloy reaches the eutectic point changing state from a solid to a liquid. The most common fixed temperature point for electrically connected heat detectors is 58°C. These detectors are often used in boiler rooms.

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Break Glass units
If someone in your building sees a fire before it has reached a smoke detector or heat detector, they need to be able to let everyone in the building know immediately. Manual call points or “break glasses” enable them to signal the emergency simply by pressing the glass.

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Fire Beams
Reflected beam smoke detectors consist of a transceiver (a transmitter/receiver) unit that projects, monitors, and receives a beam reflected across the protected area. The detector works on the principle of light obscuration.

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Fire Doors
Magnetic Smoke Door Holders: Wall or floor 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. Designed to de-magnetise and allow automatic closure of the door on command from the fire control.

Fire alarm maintenance

It is imperative that your fire alarm equipment is serviced regularly to comply with Health and Safety Regulations. You must use qualified fire alarm engineers to carry out annual fire alarm tests and inspection. Good Fire and Safety can assist you with all aspects of fire prevention and any technical questions.

Good Fire and Safety fire alarm engineers can carry out all of the necessary fire alarm tests and inspections for you and we would recommend that your fire alarm system is tested each quarter by qualified fire alarm engineers. Daily and weekly tests can be carried out by your own trained personnel.

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