Mod. SRG
V3IS00461–010
86.7
106.0
50.5
58.0
86.7
50.5
12.0
C S A
+–
125 6 7 8
15 16 17 8 9 10
3 4 556 7
300mA max
12V
8A / 250V
1
2
V
a
c
/
d
c
Fault Alarm
g
h
j
P
o
w
e
r
s
u
p
p
l
y
Power supply
User manual
SRG - CENTRAL UNIT FOR GAS DETECTOR
Read all the instructions carefully
TheSRGisacontrolunitforthecreationofgasdetectionsystemsinareas
suchasboilerrooms,workshops,warehouses,laboratories,etc.Itisdesignedto
workwithprobessuchasCOSensor,CH4SensorandLPGSensor.Itoffersthe
possibilitytocontrolasolenoidvalveoranauxiliarydevice(siren,flasher,etc.)
usinganalarmrelaycontainedinside.ThealarmorfailureisdisplayedbyLED.
SAFETY WARNINGS
To ensure correct installation, you must comply with the following
indications:
1) The device must be installed by a competent person
2) The device must be installed in a panel where, after installation, the terminals
can no longer be accessed
3) In the electrical system up the line from the energy meter there must be a
device to protect against overloads.
4) Connect the instrument following the diagrams shown in this sheet and in the
product marking
5) Before accessing the terminals, make sure the leads to connect to the
instrument are not electrically live
6) Do not power and connect the instrument if any part of it is damaged or
missing.
Code Model Description
VE204400 SRG Gasdetectorwith1connectingsensor
VE205100 CH4 SENSOR Methanedetectionsensor
VE206900 LPG SENSOR LPG sensor
VE207700 CO SENSOR Carbonmonoxidesensor
TECHNICAL CHARACTERISTICS
SRG control unit
• Powersupply:
−Voltage:12Vac/dc±10%
−Powerconsumption:~160mA
−Connection:terminalsof2.5mm2
−Protection:fuse1A5x20mm
• Input:
−1inputforCH4Sensor(methane),LPGSensor(LPG)orCOSensor(CO)
−Sensorconnection:terminalsof2.5mm2C(common),S(signal),A(powersupply)
−Max.lengthofconnection:50m
−Cross-sectionoftheleads:1.5mm2
• Output:
−Alarm:relaywithexchangecontact8A/250VAC
−Failure:opencollector12Vdc/300mAmax
−Outputconnection:terminalsof2.5mm2
• Luminoussignals: greenLED:powersupplied
yellowLED:failure
redLED:gasalarm
• Reset/testbuttonforalarmresetandprobetestfunctions
• Degreeofprotection:IP20;IP40whencorrectlyinstalledinanelectricalpanel
• Degreeofpollution:II
• Ambienttemperature:0÷+50°C
• Humidity:≤90%R.H.withoutcondensation
• Productforassemblyon6-moduleDINrails
Sensors for SRG control units
• Powersupply:fromthecontrolunitSRG
−Currentinput(at6.5V):40mA
−Connection:terminalsof2.5mm2C(common),S(signal),A(powersupply)
• Modelsandcalibration:
−Methanegas:CH4Sensor,(default)10%LIEofmethane
−LPG:LPGSensor,(default)12%LIEofisobutene
−Carbonmonoxide:COSensor,(default)200ppmofcarbonmonoxide
• Container:inself-extinguishingplasticmaterial
• Fastenedtowallusingscrewsandplasticplugs
• Protection:IP30
• Ambienttemperature:0÷+50°C
• Humidity:≤90%R.H.withoutcondensation
INSTRUMENT DESCRIPTION
Ledpowersupply
Led signaling failure
Led signaling gas alarm
Reset/Testbutton
Powersupplyterminals
Terminals for open collector failure
g
Terminalsforalarmoutputrelay
h
Terminals for gas sensor connection
Set-upjumper
j
Protectionfuse1A
INSTALLATION
Do not use the device in excess of the limits set forth in the technical data. The installer is
responsible for correct, safe installation of the product. Use care during shipping, storage
and handling.
1) Protectionofthedevice.
Toensuretheproperdegreeofprotectionoftheunit,itisnecessarytoinstallthecontrol
unitinanelectricalpanelconstructedinaccordancewithcurrentstandardsforthe
workplace,andinsideofwhichthepowersupplysystemcanalsobehoused.Thecontrol
unitcanbeinstalledatthebottomofthepanelorinDINmodularpanels.
TheLPG,COandCH4Sensorsaredesignedtobewall-mounted(vertically),usingscrews
andplasticplugs.Toproceedwithinstallation,openthecontainerbyunscrewingthe
screwlocatedontheside.Makesurenottodamagethesensorandnottotouchthe
calibration devices.
2) Installationoftheproduct.
Thecorrectinstallationoftheprobeisessentialtoproperoperationofthesystem.
Therefore,itmustbeinstalled:
–Inareaswithcirculationofnaturalair;
–Inareasthatarenotsubjecttodustordirtthatmayrenderthesensorinoperative;
–Nearjetsofwater,intakegrilles,openings,etc;
–Atanadequatedistancefromusersofgassoastopreventthesystemfromintervening
improperlyduetofunctionalleakage.
Also,positioningdependsonthetypeofgastobedetected,specifically:
– CH4 Sensor: Methane gas - at top, about 20-30 cm from the ceiling
– LPG Sensor: LPG - at bottom, about 20-30 cm from the floor
– CO Sensor: carbon monoxide – about 1.5 m from the floor
Fornewsystems,theprobemustbeinstalledaslateaspossible,sothattypical
constructionsiteactivitiesdonotdamagethedetector.
3) Connectionsanduseoftheproduct.
Normalelectricalcablescanbeusedforconnections.Inanycase,wheninstallationis
inplacesthatarestronglyexposedtoelectromagneticdisturbances,itisadvisableto
useshieldedcables.Thedetectionsystemmustalwaysbeinoperation.Therefore,the
electricalpowersupplyofthedetectormustnotincludeswitchesorotherdevicesthat
mayaccidentallyshutitoff.Thepowersupplyofthecontrolunitmustcomplywiththe
requiredvaluesandthecurrentinputofanydeviceconnecttotheterminalsoftherelay
mustbelessthanorequaltothemaximumcapacityofthecontacts.Theaveragelifespan
oftheprobesis5yearsfromthedateofinstallation.Therefore,attheendofthattime
theywillneedtobereplaced.
Attention: make sure you check operation at least once a year, and in any case
whenever there is an extended period of disuse or in the event of replacement.
Any tampering may compromise correct operation of the system.
OPERATION
Oncethedevicehasbeeninstalled,youwillneedtoselecttheoperatinglogicusing
jumperE1.Itcanbeeitherpositiveornegative.Thecontrolunitsignalsitsoperating
statusbymeansofLED’s.
A
Position A
Positive logic
Position B
Negative logic
B
A
B
E1
E1
E1
A
B
DependingonthelogicselectedusingjumperE1,inanormalsituation(noalarms),the
LED’sandtherelaywillbe:
–positivelogic:LEDon,relayenergized
–negativelogic:LEDoff,relayde-energized
Ifnegativeoperatinglogicisselected,thealarmrelaymaybecontrolledinpermanentor
impulsivemode,dependingonthepositionofjumperE2:
A
Position A
Alarm relay
Permanent control
Position B
Alarm relay
Impulsive control
B
A
B
E2
E2
E2
A
B
Oncepoweredon,thecontrolunitperformsthefollowingphasesinsequence:
• Buzzertest(durationabout5seconds)whichcausessequentiallightingoftheLED’sand
abriefringingofthebuzzer.
• Pre-heatingoftheprobe(whichlastsabout1minute),duringwhichthedetection
systemisnotoperationalbecausethisallowstheprobetoreachthecorrectoperating
temperature.
Dimensions
Connection diagram
Description
• Operationaltest(whichlastsabout3minutes)duringwhichthepowersupplyLED
flasheswithafrequencyof2Hzandalltimesettingsareresettozerotomakeiteasierto
checktheprobe.PresstheReset/Testforaboutonesecondtointerrupttheoperational
testphaseandchecktheprobe.
• Gasalarmtest,whichoccursbyplacingthetestspraycanneartheprobeandreleasing
asmallamountofgas.Donotdirectthespraydirectlyontothesensoroftheprobe,
asitmaydamageitirreparably.Thecontrolunitwillsignalthealarminthefollowing
manner:
Interface Positive logic Negative logic
Led (red) for probe alarm Off On
Alarmbuzzer Continuous sound Continuous sound
Alarmrelay De-energized Energized(permanentlyor
in impulsive mode)
PresstheReset/Testkeyforonesecondtosilencethealarm(ifthegasisnolonger
present)andendthetestphase.Torestartthetestphase,pressthecorrespondingbutton
for about 6 seconds.
• Probefailuretest,whichistobesimulatedsimplybydisconnectingtheprobecableand
checkingthefollowingsignals:
Interface Positive logic Negative logic
Led (yellow) for probe failure Off On
Alarmbuzzer Intermittent sound Intermittent sound
Faulureoutput Off On
Oncethetesthasbeenmade,re-connecttheprobeandpresstheReset/Testbuttonto
restorethecontrolunittonormaloperation.
Normal operation
Duringnormaloperationofthecontrolunit,boththemonitoringforgasalarmandthe
self-diagnosisforplantanomalies(probe)andsystemsanomalies(controlunit)areactive.
Inthisphaseandwithnoalarmsorfailures,thecontrolunitstatusisasfollows:
Interface Positive logic Negative logic
Led (green)forpowersupply On On
Led (yellow) for failure On Off
Led (red) for gas alarm On Off
Alarmbuzzer Nosound Nosound
Alarmrelay Energized De-energized
Faulureoutput On Off
Inpresenceofgasalarmorprobefailure,thecentralunitgoesintothesameconditions
describedintherelativestestphase.
REFERENCE STANDARDS
ConformitytotheEUdirectives
2006/95/EC(LowVoltage)
89/336/ECmodifiedby92/31/ECCand93/68/EEC(E.M.C.)
isdeclaredwithreferencetothefollowingharmonisedstandard:
EN 61779-1, EN 50270