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66:. Subsequently, the Australian Postmaster-General's Department engaged the CSIRO to investigate technologies that could prevent service interruption due to fire. After selecting a sample site to carry out research, the CSIRO suggested that the nephelometer should be used as the benchmark for the APO fire tests. This was installed to monitor smoke levels within the return-air ducts of the mechanical ventilation system, utilising a chart-recorder output display.
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91:
as well as releasing suppression systems. ASD alarm sensitivities are configurable and can be programmed to levels ranging from thousands of times more sensitive than a conventional detector, to much less sensitive. The detectors work best in non-volatile environments. They can also be used in computer cabinets to alert users to the overheating of computer cables or individual computer components.
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17:
1380:
90:
ASD systems incorporate more than one level of alarm. This allows an ASD system to provide very early warning of an event, prompting investigation at the earliest smouldering stage of a fire when it is easily addressed. Other alarm levels may be configured to provide fire alarm inputs to fire systems
73:
In 1979, Xtralis, then IEI Pty Ltd., produced and sold an air sampling device they called VESDA (Very Early Smoke
Detection Apparatus). The company redesigned the detector in 1982 to provide the reliability, features, size and reduced cost for export markets. ASD systems have gained popularity due to
107:
ASDs are suitable for environments where a highly sensitive rapid smoke detection capability is required. This makes them suitable in clean rooms; areas which contain goods easily damaged by fire, such as tobacco, electronic rooms and highly flammable liquid and gases. Often, normal point detectors
86:
Unlike passive smoke detection systems, including spot detectors, ASD systems actively draw smoke to the detector through bore holes within a piping system that runs throughout the protected area. Furthermore, ASD systems incorporate integrity monitoring to ensure an alert is raised at any time the
82:
ASD design corrects shortcomings of conventional smoke detectors by using a sampling pipe with multiple holes. The air samples are captured and filtered, removing any contaminants or dust to avoid false alarms and then processed by a centralized, highly sensitive laser detection unit. If smoke is
115:
Despite their high sensitivity ASDs can be used in dusty or dirty environments as long as correct design, installation and maintenance processes are followed. Most ASD products can accommodate a broad range of environments and applications – from both confined and open spaces to the cleanest or
111:
As they can be easily hidden, pipe networks are suitable in environments where point detectors can be considered aesthetically displeasing, such as offices, apartments and hotel rooms. This factor also makes them suitable in locations where point detectors can be easily tampered with, such as in
69:
At the conclusion of several weeks of testing, it was discovered that there no commercially available fire detection technology suitable for preventing damage to telephone equipment. One technology that did show great promise however was the nephelometer itself.
154:
87:
ASD's ability to detect smoke is compromised. This is not the case with passive devices that are generally only electrically monitored with no ability to determine if smoke can actually reach the detection element.
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that detects the presence of smoke particles suspended in air by detecting the light scattered by them in the chamber. ASDs can typically detect smoke before it is visible to the naked eye.
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In most cases aspirating smoke detectors require a fan unit to draw in a sample of air from the protected area through its network of pipes.
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will recognise the danger too late, as smoke often does not reach the ceiling quickly enough for a fire to be detected in a timely fashion.
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36:, consisting of a central detection unit which draws air through a network of pipes to detect smoke. The sampling chamber is based on a
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detected, the systems alarm is triggered, and signals are then processed through centralized monitoring stations within a few seconds.
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dirtiest environment, including telecomm, control rooms, waste treatment, mining and more.
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An example of how a simple ASD unit with a single pipe could cover a five-room area
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their ability to sense smoke long before a catastrophic incident.
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Commonwealth
Scientific and Industrial Research Organisation
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National
Council of Examiners for Engineering and Surveying
326:. Institution of Agricultural Engineers. 2000. p. 49.
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1011:Penetrant (mechanical, electrical, or structural)
464:, Safe Fire Detection Inc, Retrieved 2010-03-23
227:. Cole Innovation & Design. Archived from
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290:Intelligent Buildings and Building Automation
20:A TOP-SENS2 ASD unit made by Wagner (Germany)
8:
819:Hypoxic air technology for fire prevention
509:
495:
487:
371:Andrew Furness and Martin Muckett (2007).
1204:Fire Equipment Manufacturers' Association
202:Journal of Applied Fire Science, Volume 2
537:Boiling liquid expanding vapor explosion
455:"What is CCD Aspriating Smoke Detection"
178:. Fire Security Services. Archived from
1183:Listing and approval use and compliance
146:
374:Introduction to fire safety management
343:. Butterworth-Heinemann. p. 369.
1228:Society of Fire Protection Engineers
293:. Taylor & Francis. p. 236.
7:
1379:
1222:National Fire Protection Association
225:"The HISTORY of VESDA and MONITAIR"
724:Condensed aerosol fire suppression
437:from the original on 15 April 2009
412:from the original on 15 April 2009
205:. Baywood Publishing Company. 1993
155:"Aspirating Smoke Detectors (ASD)"
14:
1099:Fire alarm notification appliance
249:Weadock, Megan (5 October 2009),
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431:"VESDA: Correctional Facilities"
860:Vehicle fire suppression system
548:Combustibility and flammability
1:
1210:Institution of Fire Engineers
1167:Fire Safety Evaluation System
839:Personal protective equipment
274:Do You Have (Fire) Protection
1281:GHS precautionary statements
1119:Manual fire alarm activation
482:Three Wavelength Integrating
477:Detecting smoke in air ducts
255:, Security Products Magazine
1152:Fire protection engineering
1084:Explosive gas leak detector
901:Electromagnetic door holder
734:External water spray system
62:to carry out research into
1443:
1328:Harry C. Bigglestone Award
719:Automatic fire suppression
659:K-factor (fire protection)
377:. Routledge. p. 228.
95:Installation and placement
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1234:Underwriters Laboratories
1069:Aspirating smoke detector
729:Detonation flame arrester
695:
112:correctional facilities.
26:aspirating smoke detector
1417:Fire detection and alarm
1178:Kitchen exhaust cleaning
1094:Fire alarm control panel
1074:Carbon monoxide detector
1051:Standpipe (firefighting)
814:Gaseous fire suppression
579:Enthalpy of vaporization
323:Landwards, Volumes 55-58
126:Carbon monoxide detector
1021:Pressurisation ductwork
986:Firewall (construction)
834:Passive fire protection
784:Fire suppression system
1407:Active fire protection
1197:Industry organizations
1162:Fire-resistance rating
1041:Smoke exhaust ductwork
1016:Penetration (firestop)
1006:Packing (firestopping)
714:Active fire protection
674:Spontaneous combustion
287:Shengwei Wang (2009).
276:, Strategic Facilities
252:A Dangerous Blind Spot
104:
34:active fire protection
32:) is a system used in
21:
1349:Template:Firefighting
1323:Arthur B. Guise Medal
1276:GHS hazard statements
779:Fire sprinkler system
759:Fire-retardant fabric
102:
19:
1133:Professions, trades,
1046:Smokeproof enclosure
906:Electromagnetic lock
614:Flammability diagram
525:Fundamental concepts
406:"VESDA: Clean Rooms"
231:on November 18, 2008
1427:Aerosol measurement
1089:Fire alarm call box
996:Heat and smoke vent
182:on October 14, 2008
1061:Fire alarm systems
876:Annulus (firestop)
804:Flashback arrestor
769:Fire-safe polymers
764:Fire retardant gel
619:Flammability limit
460:2016-01-13 at the
337:Sam Kubba (2009).
105:
22:
1394:
1393:
1302:Safety data sheet
1297:List of S-phrases
1292:List of R-phrases
1188:Sprinkler fitting
1079:Circuit integrity
951:Fire extinguisher
789:Firefighting foam
684:Thermal radiation
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1286:Life Safety Code
891:Compartmentation
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624:Flammable liquid
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869:Building design
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799:Flame retardant
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744:Fire prevention
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1271:Flame spread
1157:Fireproofing
1135:and services
1068:
1036:Smoke damper
1026:Safety glass
961:Fire hydrant
926:Fire curtain
886:Booster pump
845:Relief valve
809:Fusible link
599:Fire loading
594:Fire control
564:Deflagration
450:
439:. Retrieved
425:
414:. Retrieved
400:
390:November 29,
388:. Retrieved
373:
366:
354:. Retrieved
339:
332:
322:
316:
304:. Retrieved
289:
282:
273:
268:
257:, retrieved
251:
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233:. Retrieved
229:the original
219:
207:. Retrieved
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195:
184:. Retrieved
180:the original
170:
159:. Retrieved
149:
114:
110:
106:
89:
85:
81:
72:
68:
64:forest fires
60:nephelometer
51:In 1970 the
50:
42:
38:nephelometer
29:
25:
23:
991:Grease duct
946:Fire escape
936:Fire damper
829:Intumescent
774:Fire safety
739:Fire bucket
634:Flash point
433:. xtralis.
408:. xtralis.
1401:Categories
1288:(NFPA 101)
1251:CE marking
1104:Fire drill
707:Technology
604:Fire point
589:Fire class
569:Detonation
441:2009-05-11
416:2009-05-11
235:2009-05-11
186:2009-05-11
161:2012-08-09
142:References
53:Australian
1412:Detectors
1244:Standards
1173:Fire test
1001:Occupancy
966:Fire pump
956:Fire hose
941:Fire door
921:Exit sign
896:Crash bar
669:Pyrolysis
664:Pool fire
629:Flashover
584:Explosive
532:Backdraft
259:5 October
157:. Siemens
1373:Category
1337:See also
1266:EN 16034
976:Firestop
931:Fire cut
654:Jet fire
644:Gas leak
560:(HAZMAT)
543:Boilover
458:Archived
435:Archived
410:Archived
120:See also
1385:Commons
1218:(NCEES)
539:(BLEVE)
356:May 29,
306:May 29,
209:May 29,
47:History
1316:Awards
1230:(SFPE)
1224:(NFPA)
1206:(FEMA)
1169:(FSES)
381:
347:
297:
78:Design
1422:Smoke
1307:UL 94
1261:EN 54
1212:(IFE)
841:(PPE)
1256:EN 3
1236:(UL)
392:2013
379:ISBN
358:2013
345:ISBN
308:2013
295:ISBN
261:2009
211:2013
30:ASD
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