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EuropeanSafetySystemsLtd. Impress House, MansellRoad, Acton, London W37QHsales@e2s.com Tel: +44 (0)20 8743 8880
www.e2s.com Fax: +44 (0)20 8740 4200
DocumentNo. IS4501 Issue E27-11-09 Sheet 2of6
2) Theequipmentmaybeused inzones0,1and2
withflammablegasesandvapourswithapparatus
groupsIIA,IIB&IICandwithtemperatureclasses
T1, T2, T3andT4.
3) Theequipmentisonlycertifiedforuseinambient
temperaturesintherange -40oCto+60oCand
shouldnot be usedoutsidethisrange.
4) Thecertificatenumberhasan ‘X’suffix,which
indicatesthatthecertificatecontainsoneofmore
specialconditionsforsafeuse.Thoseinstallingor
inspectingtheequipmentshouldrefertothissection
ofthecertificate.
5) Theequipmenthasnotbeenassessedasasafety-
related device(asreferred tobyDirective94/9/EC
AnnexII, clause1.5).
6) Installationofthisequipment shall be carried out by
suitably-trained personnelinaccordancewiththe
applicablecodeofpractice.
7) Repairofthisequipment shall onlybe carried out by
themanufacturerorinaccordancewiththe
applicablecodeofpractice.
8) Thecertificationofthisequipment reliesonthe
followingmaterialsused initsconstruction:
Enclosure: ABSPlastic
Iftheequipment islikelytocomeintocontact with
aggressivesubstances, thenit istheresponsibilityof
theusertotakesuitableprecautionsthat prevent it
frombeingadverselyaffected, thusensuringthat the
type ofprotectionisnot compromised.
“Aggressivesubstances”-e.g. acidicliquidsor
gasesthat mayattackmetals, orsolventsthat may
affect polymericmaterials.
“Suitableprecautions”-e.g. regularchecksaspart
ofroutineinspectionsorestablishingfromthe
material’sdatasheet that itisresistant tospecific
chemicals.
SPECIALCONDITIONSFORSAFEUSE (asstatedonthe
ECTypeExamination CertificateSIRA 04ATEX2301X)
Theequipmentshall onlybe supplied viaTerminals+w.r.t.
Terminals-fromabarrierhavingamaximumopencircuit
voltage Uothatis< 28Vandamaximumshort circuitcurrent
Iothatis< 93 mA,whereIoisresistivelylimited.Thebarrier
shall be ATEXcertifiedbyanotified body.
Thetotalcapacitanceconnectedtoterminals+wrt–(i.e.the
capacitanceofthecableplusanyothercapacitance)shall
not exceed83nF.
Theenclosureisnon-conductingand maygeneratean
ignition-capablelevelofelectrosaticchargesundercertain
extremeconditions.The usershouldensurethatthe
equipmentisnotinstalled inalocationwhereitmaybe
subjectedtoexternalconditionsthatmightcauseabuild-up
ofelectrostaticchargesonnon-conductingsurfaces,
additionally,cleaningofthe equipmentshouldbedoneonly
withadampcloth.
Theequipmenthasaningress protectionratingofIP66;
however,if ithasbeensuppliedwithoutacableentrydevice,
thentheusershall ensurethatthedevicethatisfittedwill
provide an ingressprotectionthatisappropriatetothe
environment inwhichit isinstalled i.e. IP20orbetter.
4.2Zones, Gas GroupsandTemperatureClassification
TheIS-A105NsounderhasbeencertifiedExiaIICT4Ga.
Whenconnectedtoan approvedsystemitmaybeinstalled
in:
Zone0 explosivegasairmixture
continuouslypresent.
Zone1 explosivegasairmixturelikelytooccurin
normaloperation.
Zone2 explosivegasairmixturenotlikelytooccur,
andifit does, it willonlyexist forashort time.
Beusedwithgasesingroups:
GroupA propane
GroupB ethylene
GroupC hydrogen
Having atemperatureclassification of:
T1 450ºC
T2 300ºC
T3 200ºC
T4 135ºC
4.3Terminals+and -
Powerissuppliedtothesounderviathe+and–terminals
whichhavethefollowinginput safetyparameters:
Ui = 28V
Ii = 93mA
Pi = 660mW
Ci=0 Li=0
TheIS-A105Nsoundermaybepoweredfroman ATEX
certified Zenerbarrierorgalvanicisolatorwhichhaveoutput
parametersequaltoorlessthan 28V,93mAand 660mW
whereIoisresistivelylimited.Thecableparametersstated
ontheselectedZenerbarrierorgalvanicisolatorcertificate
must beobserved.
Uptothree IS-A105Nsounderscan be connected inparallel
andpoweredfromacommonbarrierorisolator.Connecting
twosoundersinparallelwill reducetheoutputfromeachby
about3dB.Three soundersshouldonlybe poweredfroma
commonsupplywhenthemaximumsupplyvoltage is
available.
4.4TerminalsS2and S3
WhenterminalsS2orS3areconnectedto0V(- terminal)the
sounderoutputtonechangestothesecondorthirdstage
alarmrespectively.Theinputsafetyparametersforthese
terminalsare:
Ui = 28V
Ii = 0mA
Becausethepermitted inputcurrentiszero,theseterminals
mayonlybe connected toadiodereturnbarrier,an
