NOHMI FDK Series - User Manual

-
F
-
2719
D
CAT. NO.
PHOTOELECTRICSMOKEDETECTOR
FEATURES
(
1
)
Smallmonitoringcurrentof45μA
(
2
)
2-wiresystem
(
3
)
Alarmresponselamp
(
LED
)
(
4
)
Simplemounting
(
5
)
Veryeasymaintenance
(
6
)
Verylowprofile
(
7
)

Conventionaltype
DESCRIPTION
TheFDKseriesphotoelectricsmokedetectorsdetect
combustionproducts(smoke)generatedbyafire,and
transmitanalarmsignaltothefirealarmcontrolpanel.
Thephotoelectricsmokedetectorcandetectafireinan
earlierstagethanaheatdetector.Generally,this
detectorisinstalledinthespacessuchasbasements,
ordinaryfloors,corridors,staircases,elevatorshafts.
OPERATINGPRINCIPLEANDFUNCTION
Thephotoelectricsmokedetectoriscomposedofalight
source,lightsensingelement,lightshieldingelement
anddetectingchamber.Thelightsource(a
light-emittingdiode)emitslightatintervalsofabout3.5
seconds,whichdoesnotreachthelightsensing
element(photodiode)undernormalconditionsbecause
ofthelightshieldingmold.Ifsmokeentersthedetecting
chamber,thelightfromthelightsourceisscatteredby
smokeparticlesandreachesthelightsensingelement.
Thelightreachingthelightsensingelementvarieswith
smokedensityandifitexceedsthepredeterminedlevel,
thedetectoroperatesandautomaticallyholdsits
operation.
Thedetectorthentransmitsthealarmsignaltothefire
alarmpanelandtheresponselampofthedetectorturns
on.
WITHSURFACEMOUNTINGBASE
WITHRECESSMOUNTINGBASE
SENSITIVITY
TYPE
RESPONSELAMP
RATEDVOLTAGEANDCURRENT
ALLOWABLERANGEOFVOLTAGE
QUIESCENTCURRENT
ALLOWABLERANGEOFAMBIENTTEMPERATURE
MATERIAL
WEIGHT
Ordinary
Approx.120g
Withremoteindicationcircuit
Approx.140g
LED
(
Red
)
24VDC,100mA
15Vto30VDC
Approx.45μA
−10to50℃
Mainbody:ABSresin
Base:Polycarbonateresin
FDK246/FDK246NModelno. FDK246
-
X
Ordinarytype
Thedetectorsarealsoavailableindifferentmodels,i.e.FDK346
(
Class3sensitivity
)
,FDK146
(
Class1sensitivity
)
.
SPECIFICATIONS
●HEADOFFICE：7
-
3,Kudan-Minami4-chome,Chiyoda-ku,Tokyo102
-
8277,Japan●PHONE：（81）3
-
3265
-
0231●FAX：（81）3
-
3265
-5348

NOHMI FDK Series Specifications