FIRE SAFETY & DISASTER RECOVERY
detection. They are fan-operated and draw samples of air into the detector for constant analysis and forensic assessment for the presence of smoke, rather than waiting for convection currents to ultimately deliver smoke to the unit. If smoke is detected, alert signals are then processed within milliseconds.
The patented sampling chamber inside the detector distinguishes the presence of smoke particles suspended in air by detecting the light scattered in the chamber. For greater accuracy Siemens utilises two light wavelengths, blue and infrared, and this enables the detection of minute airborne particles that are produced in the earliest stages of overheating or in open fires. By determining the size and concentration of these airborne particles, these highly sensitive ASDs are able to differentiate the earliest presence of smoke, as well as accurately identify dust and steam particles. As a result, they offer an extremely high level of reliability with absolute immunity to deceptive phenomena, removing any potential risk of a false alarm.
The chamber is specially designed to keep dust ingress to an absolute minimum; air samples are sensed and filtered, removing any unwanted particles and contaminants. This
feature enables ASDs to be installed in hostile or dirty environments and also improves the product lifespan and level of maintenance support required.
ASDs offer up to three modes of operation: ultrasensitive, auto-discrimination and robust. Furthermore, an alarm threshold can be defined and programmed. These configurable levels of alarms enable investigation at the earliest smouldering stage of a fire, when it is easily addressed and further risk can be averted. Such is the reliability of the unit, it can be configured to release gas extinguishing systems where previously, conventional detectors required several alarm alerts before release.
AESTHETICS Where aesthetics are of particular
importance, aspirating devices are ideal as the pipework network is concealed. Historical and prestigious locations such as theatres, museums, stately homes, hotels and libraries can take advantage of this facility. The Hague Museum of Public Transport is a national monument in the Netherlands that houses a collection of valuable vintage trams and buses; the museum also has a dual function as an event and conference centre. Not only does the
Siemens ASD system protect all the visitors to the museum, but also the irreplaceable exhibits located on site.
SUMMARY Siemens ASD technology offers
a quantum leap towards alarm certainty with false alarm immunity. This new dual wavelength aspirating technology is highly reliable in terms of fire response and false alarm discrimination. Given the challenges of critical environments with high airflow and risk of debris, we should expect such technology will supersede conventional devices and provide users with a better level of performance at lower cost of initial outlay, installation and lifecycle ownership. In specific applications this technology allows us to progress beyond today’s standards, such as using a single detector to deliver coincidence alarm, including gas extinguishing release.
www.siemens.com/ buildingtechnologies
ENVIRONMENTS THAT REQUIRE SPECIALISED PROTECTION
• Highly ventilated areas, such as datacentres, IT rooms, computer suites, clean rooms and operating theatres
• Organisations that store and manufacture highly flammable liquids and gas materials, such as power stations, gas depots and waste treatment plants
• Harsh industrial environments that can be subject to airborne dust, debris and dirt such as mining, welding and heavy industrial processes, which can cause false alarms with standard detection systems
• Hard-to-access areas such as cable ducts and underground stations, as well as high-ceiling areas such as warehousing
www.tomorrowsfm.com
TOMORROW’S FM | 27
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