空气采样烟雾探测报警系统在回风口配置取样管路时的设计依据为何，笔者为大家做出解释：
　　
　　参考文献
　　
　　1.NFPA318Cleanroom
　　
　　2.NFPA72NationalFireAlarmCode
　　
　　3.FMLossPreventionDataSheets
　　
　　1-56Cleanrooms
　　
　　4.FMLossPreventionDataSheets
　　
　　7-7SemiconductorFabricationFacilities
　　
　　5.IRInformationIM.17.11Cleanrooms,IndustrialRiskInsurers
　　
　　NFPA318ProtectionofCleanrooms
　　
　　2-3.1AlistedorapprovedsamplingsmokedetectionsystemshallbeprovidedinTheclearnessrerunairstreamatapointbeforedilutionfrommake-upairoccurs.Thesystemshallhaveaminimumsensitivityof0.03percentperftobstruction.Thesystemshallbecapableofmonitoringparticlesto10micronsorless.Wherethesystemisofthelight-scatteringtype,itshallhaveaminimumsensitivityof.03percentperftobstruction;wherethesystemisofthecloudchambertype,itshallhaveaminimumsensitivityof50,000parcelspermillimeter.
　　
　　经列出或验证之空气极早采样系统应装置于无尘室中,回风气流在混合空气稀释空气前之处,此系统应至少有0.03%ft.obs(0.1%/m.obs)之灵敏度,并能侦测10微米或以下大小之烟雾粒子,此统若为散射光式,其最低灵敏度应达0.03%/ft-obe;此为统若为云雾式,其最低灵敏度应达50000particles/mm
　　
　　FMLossPreventionDataSheets7-7SemiconductorFabricationFacilities
　　
　　2.2.1CleanRoomAirHandlingSystem
　　
　　3.AnFMRCApprovedsmokedetectionsystemshouldbeprovidedwithinthemakeupairhandlerunitsorclosetothemdownstream.Thesmokedetectionsystemshouldbearrangedtoalarmataconstantlyattendedlocationandshutdownthemakeupairunitsuponalarmtopreventcontinuedintakeofcontaminatedmakeupair.
　　
　　4.AnFMRCApprovedairsamplingorlinearbeamsmokedetectionsystemshouldbeprovidedwithinthereturnairpath.Whenthefabricationareasmoke/contaminantcontrolsystemisintegratedwiththefabricationareaair-handlingsystem,thesedetectorsshouldbearrangedtoclosedampers(uponalarm)whichstoptheflowofrecirculatingairtothecleanroomandopendamperswhichdiverttheflowofsmoke/contaminantwithinthecleanroomtotheatmosphere.Inallcasesthesedetectorsshouldbearrangedtoalarmataconstantlyattendedlocation.
　　
　　IndustrialRiskInsures
　　
　　IM.17.11Cleanrooms
　　
　　AirHandlingSystem
　　
　　A.Automaticsmokedetectorsofthesamplingtypeshouldbeinstalledwhereconditionedairexitsthecleanroom.
　　
　　B.AutomaticsamplingtypesmokedetectorsshouldbeinstalledthroughouttheunderfloorareaofthecleanroominaccordancewiththerequirementsofNFPA72E.Thedetectorsystemsshouldalarmataconstantlyattendedlocation.
　　
　　C.SmokeremovalsystemsthatusetheHVACsystemforexhaustshouldbeequippedwithsmokedetectorsinreturnairductsarrangedtostoptherecirculationairfansanddivertallairtoexhaust.
　　
　　

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