3
EDS-TECHNICALINFORMATION
If the above regulations are performed it's good to
adjustthetrimmersofthetwocircuitssimmetrically.
For example if the sensitivity of circuit 1 ( P1 ) is
regulatedtohalf scale, it wouldbegood to regulate
tohalf scalethesensitivityofcircuit2also(P3).
Normallythedetectorissetinourfactorytothemaximum
sensitivityandwithanalarmdelayof10seconds.
Iftheareatobeprotectedislargerthanthemaximum
coverableareaofthedetector,itwouldbealsobegood
toreducethesensitivity.Inthiswayabetterfalsealarm
immunityisobtained.Theoptimumalarmdelayisabout
10-12seconds.
9- Once that the installing and the adjusting
operationsare doneyou cangoon withthe working
test(ifpermittedbytheenvironmentalconditions).
In this case, after power supplying the device, it is
necessarytoproduce,withpetrol,a20cmhighflame
ona20x20cmbase andpositionedatthemaximum
distanceindicatedfor thedetector.Aftera10-12sec.
delayan alarmshould begenerated.
Thistestmustbeconductedunderhigh surveillance.
10 - The FL20BA/BI is provided with a remote
test circuit.
Tousethis feature it isnecessaryto connect a cable
toterminal3.Thenconnectabutton(normallyopen
contact)between thiscableand thenegativepole of
thepower supply (seefig. 4).
By pressing the button the internal test circuit that
simulatesaflameisactivatedandafterthealarmdelay,
thedetector givesout analarm.
11 -Ifsomefalsealarmstakesplace,verifyifthere is
anyperturbatingelementintheenvironment(seepoint
1)andeventually adjustthesensitivityandthealarm
relaylevels.
12- The FL20BA/BI detector can work with only
one of the circuits described in point 7. To activate
or deactivate a circuit it's necessary to use JP1
and JP2 jumpers. In the 1-2 position the jumper
deactivates the circuit, in the 2-3 position the
jumperactivates the circuit. Incaseof false alarms,
as the two circuits work on different wavelenghts,
it is possible to deactivate the circuit for a brief
period to get the dector to be not sensible to
eventualperturbatingelements.
13-Importantinstallationrules
13.1 - Avoid the detector's direct view of the sun
light (for example from a window). The sun is a
powerfulinfraredradiation source and if this sorce
is somehow "modulated" by some element, like
for example a curtain moved by the wind in front
of a window, it can cause false alarms.
13.2-Avoidthedetector'sdirectviewofincandescent
lampsmounted on theceilingthat can oscillate(the
oscillation produces a modulation of the infrared
radiationsemittedbythelamps)
13.3-Avoidthedetector's viewofanyotherinfrared
source that can be somehow modulated by any
environmentalcondition.Howeverconsiderthat,for
thedetector to giveout an alarm,itis necessary that
theinfraredsource remainsactive foratime equalto
the alarm delay time(8 - 10 sec. depending on the
regulation).Soshorttimemodulatedinfraredradiation
willnotcauseanalarm.
14 - Maintenance
Thedetector has tobetested periodically.
Ifthe detectorhasa testbutton, as indicatedin point
10,theWorkingTest isvery easyandquick.Ifnot,it
isnecessary toperformthe testusing a realflame as
decribedin point9.
It is suggested to periodically clean the viewing
window of the optical head. In fact an excessive
quantityofdirtcanlowerthedetector'ssensitivityand
itsoverallperformance.
