Fike FVA-IP - Detection Range

FVA-IP Camera Installation and Operation Manual
Revision Date: June, 2019 P/N 06-523 (Rev. 5) 7
Table1–DetectiontimesinsecondsofIPcameramodelstovarioussources.
FuelSource
Distanceto
detector
2.8mmFOV 6mmFOV 8mmFOV
EX8mm
FOV
1ftpanofHeptane 100ft 18 9 9 9
1ftpanofJP‐8 100ft 18 10 10 10
1ftpanofEthylAlcohol 100ft 21 10 11 11
1ftpanofIsopropylAlcohol 100ft 16 9 9 10
1ftpanofUnleadedGasoline 100ft 8 8 8 9
4minSmokeEmitter 100ft 301 94 52 63
4minSmokeemitter 75ft 43 24 22 48
6inpanofHeptane 100ft 100 10 9 10
Cardboardboxesandpaper
4ea.10x10x4‐in.boxes
100ft 278 83 101 97
6indiameterpanof
Heptane/toluene75/25
28ft 19 19 20 18
Shreddednewspaper 28ft 127 150 102 151
Smolderingwood 28ft 3062 3279 3027 2927
WoodCrib6x6x2.5‐in. 28ft 142 192 145 194

NOTE:Knownnuisancesourcesinclude:Welding,grinding,modulatedlightsources,anddirectionallightsources.
2.3 DetectionRange
After proper camera positioning, detection range is the second most important consideration.  The most sensitive
detectionalgorithmtodistanceisflamedetection,becauseitreliesondirectflameimagepatternanalysis.Todetecta
flame, the pattern must be at least 7 by7 pixelsin size. Youcanperformcalculationstodeterminearelationship
between thedistance and lens angle to the fire size at detection.  The range of potential smoke sources and their
correspondingopticaldensitiesmakesitdifficultto theoretically estimate theexactdistanceat whichathresholdof
smokedetectionwillbereached.TheOffsitedetectionmethoddependsonavarietyoffactorssuchasthepresence
andpropertiesofreflectingsurfaces,thetypeofcombustible,andthelightingconditions.Theoffsitealgorithmisnot
FMapprovedbecauseofthesemanyvariables.
Camerasshouldbeplacedsothatcoveragewilldetectthedesiredfiresizeandtypeconsistentwiththehazardarea.
Thenumberofcamerasneededshouldbedeterminedonthebasis ofcameraposition.Unlikemanyradiantenergy
sensingfiredetectors,flamesthatareobstructedoroutsidetheFOVmaybedetected,dependingonthenumberof
obstructionsandthereflectivepropertiesofthesurroundingsurfaces.Videoflameandsmokedetectorperformance
is relatively uniform across the plane intersecting a source’s optical axis.  Unlike fire detectors that sense radiant
energy,correctionsforfiresizevs.distanceneednotbegivenforfiresthatmayoccurawayfromtheopticalaxisofthe
detector.YoucanalsoassumethatsmokestartingoutsidetheFOVofacameramaydriftintotheFOV.Whilethese
featuresprovideextradetection,the primaryobjectiveistoensurethatallregionsrequiringdetectioncoverageare
withintheFOVofatleastonecamera.Crosszoningcamerasalsoprovidesanopportunitytoreducenuisancealarms
causedbydirectionallightsources.