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ON

SRG.4

123 4

TEST

RESET

Mod.SRG.4

V3IS00460–010

86.7

159.5

50.5

12.0

58.0

86.7

50.5 50.5

C1 S1 A1C2S2A2C3 S3 A3C4 S4 A4

12 34

SENSORS

+ –

1

23 4 5678

9101112 13 1415 16 1718 1920

8A / 250V8A / 250V

1

2

V

a

c

/

d

c

Description

 

g 

h







j 

User manual

SRG.4 - CONTROL UNIT FOR GAS DETECTOR

Read all the instructions carefully

 TheSRG.44isacontrolunitforthecreationofgasdetectionsystemsinareas

suchasboilerrooms,workshops,warehouses,laboratories,etc.Itisdesignedto

workwithprobessuchasCOSensor,CH4SensorandLPGSensor.Itoffersthe

possibilitytocontrolasolenoidvalveoranauxiliarydevice(siren,flasher,etc.)

usinganalarmrelaycontainedinside.ThealarmorfailureisdisplayedbyLED.

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.

Codice Model Description

VE203600 SRG.4 Gasdetectorwith4connectingsensor

VE205100 CH4 SENSOR Methanedetectionsensor

VE206900 LPG SENSORLPG sensor

VE207700 CO SENSOR Carbonmonoxidesensor

TECHNICAL CHARACTERISTICS

Control unit SRG.4

• Powersupply:

 −Voltage:12Vac/dc±10%

 −Powerconsumptionwith1probe:~160mA

 −Powerconsumptionwith4probes:~280mA

 −Connection:terminalsof2.5mm

2

 −Protection:fuse1A5x20mm

• Inputs:

 −4inputsforCH4Sensor(methane),LPGSensor(LPG),COSensor(CO).

 −Connectionofprobes:terminalsof2.5mm

2 per probe

 −Max.connectionlength:50mforeachprobe

 −Cross-sectionoftheleads:1.5mm2

• Output:

 −Alarm:relaywithexchangecontact8A/250VAC

 −Failure:relaywithexchangecontact8A/250VAC

 −Connection:terminalsof2.5mm

2forrelayC-NC-NO

•Luminoussignals: 1greenLED:powersupplied

 1yellowLED:generalfailure

 4yellowLED’s:failureforeachprobeline

 4redLED’s:gasalarmforeachprobeline

• Reset/testbuttonforalarmresetandprobetestfunctions

• Degreeofprotection:IP20;IP40whencorrectlyinstalledinanelectricalpanel

• Ambienttemperature:0÷+50°C

•Humidity: 90%R.H.withoutcondensation≤

• Productforassemblyon9-moduleDINrails

Sensors for SRG.4 control units

• Powersupply:fromthecontrolunitSRG.4

 −Currentinput(at6.5V):40mA

 −Connections:terminalsof2.5mm

2forprobeC(common),S(signal),A(power6.5Vdc)

• Modelsandcalibration:

 −Methanegas:CH4Sensor,(default)10%LIEofmethane

 −LPG:LPGSensor,(default)12%LIEofisobutene

 −Carbonmonoxide:COSensor,(default)200ppmofCO

• Container:inself-extinguishingplasticmaterial

• Fastenedtowallusingscrewsandplasticplugs

• Protection:IP30

• Ambienttemperature:0÷+50°C

•Humidity: 90%R.H.withoutcondensation≤

INSTRUMENT DESCRIPTION



 Ledpowersupply



Led signaling general failure



 Reset/Testbutton



Led signaling failure probes



Led signaling gas alarm



 Powersupplyterminals

g

Connection probes terminals

h

 Protectionfuse1A



 Set-upjumper

j

 Terminalsforalarmoutputrelay



 Terminalsforfailureoutputrelay

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) Protectionofthedevice.

 Toensuretheproperdegreeofprotectionoftheunit,itisnecessarytoinstallthecontrol

unitinanelectricalpanelconstructedinaccordancewithcurrentstandardsforthe

workplace,andinsideofwhichthepowersupplysystemcanalsobehoused.Thecontrol

unitcanbeinstalledatthebottomofthepanelorinDINmodularpanels.

 TheLPG,COandCH4Sensorsaredesignedtobewall-mounted(vertically),usingscrews

andplasticplugs.Toproceedwithinstallation,openthecontainerbyunscrewingthe

screwlocatedontheside.Makesurenottodamagethesensorandnottotouchthe

calibration devices.

2) Installationoftheproduct.

 Thecorrectinstallationoftheprobeisessentialtoproperoperationofthesystem.

Therefore,itmustbeinstalled:

 –Inareaswithcirculationofnaturalair;

 –Inareasthatarenotsubjecttodustordirtthatmayrenderthesensorinoperative;

 –Nearjetsofwater,intakegrilles,openings,etc.

 –Atanadequatedistancefromusersofgassoastopreventthesystemfromintervening

improperlyduetofunctionalleakage.

 Also,positioningdependsonthetypeofgastobedetected,specifically:

 –CH4:Methanegas-attop,about20-30cmfromtheceiling

 –LPG:LPG-atbottom,about20-30cmfromthefloor

 –CO:carbonmonoxide–about1.5mfromthefloor

 Fornewsystems,theprobemustbeinstalledaslateaspossible,sothattypical

constructionsiteactivitiesdonotdamagethedetector.

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.

3) Connectionsanduseoftheproduct.

 Normalelectricalcablescanbeusedforconnections.Inanycase,wheninstallationis

inplacesthatarestronglyexposedtoelectromagneticdisturbances,itisadvisableto

useshieldedcables.Thedetectionsystemmustalwaysbeinoperation.Therefore,the

electricalpowersupplyofthedetectormustnotincludeswitchesorotherdevicesthat

mayaccidentallyshutitoff.Thepowersupplyofthecontrolunitmustcomplywiththe

requiredvaluesandthecurrentinputofanydeviceconnecttotheterminalsoftherelay

mustbelessthanorequaltothemaximumcapacityofthecontacts.Theaveragelifespan

oftheprobesis5yearsfromthedateofinstallation.Therefore,attheendofthattime

theywillneedtobereplaced.

Attention: in the case in which in every single terminal block of the control

unit missed the probes, there must be a resistence of 18KOhm 1/4 W 5%

between C ans S furnisced in the box.

OPERATION

 Oncethedevicehasbeeninstalled,youwillneedtoselecttheoperatinglogicusing

jumperE1.Itcanbeeitherpositiveornegative.Thecontrolunitsignalsitsoperating

statusbymeansofLED’s.

A

Position A

Positive logic

Position B

Negative logic

B

A

B

E1

E1

E1

A

B

 DependingonthelogicselectedusingjumperE1,inanormalsituation(noalarms),the

LED’sandtherelaywillbe:

 –positivelogic:LEDon,relayenergized

 –negativelogic:LEDoff,relayde-energized

 Ifnegativeoperatinglogicisselected,thealarmrelaymaybecontrolledinpermanentor

impulsivemode,dependingonthepositionofjumperE2:

A

Position A

Alarm relay

Permanent control

Position B

Alarm relay

Impulsive control

B

A

B

E2

E2

E2

A

B

Dimensions

Connection diagram

 Oncepoweredon,thecontrolunitperformsthefollowingphasesinsequence:

• Buzzertest(durationabout5seconds)whichcausessequentiallightingoftheLED’sand

abriefringingofthebuzzer.

• Pre-heatingoftheprobe(whichlastsabout1minute),duringwhichthedetection

systemisnotoperationalbecausethisallowstheprobestoreachthecorrectoperating

temperature.

• Operationaltest(whichlastsabout3minutes)duringwhichthepowersupplyLED

flasheswithafrequencyof2Hzandalltimesettingsareresettozerotomakeiteasierto

checktheprobes.PresstheReset/Testforaboutonesecondtointerrupttheoperational

testphaseandchecktheprobes.

• Gasalarmtest,whichoccursbyplacingthetestspraycanneartheprobeandreleasing

asmallamountofgas.Donotdirectthespraydirectlyontothesensoroftheprobe,

asitmaydamageitirreparably.Thecontrolunitwillsignalthealarminthefollowing

manner:

InterfacePositive logicNegative logic

Led for alarm (red)

of concerned probe

Off On

Alarmbuzzer Continuous soundContinuous sound

AlarmrelayDe-energized Energized(permanentlyor

in impulsive mode)

 PresstheReset/Testkeyforonesecondtosilencethealarm(ifthegasisnolonger

present)andendthetestphase.Torestartthetestphase,pressthecorrespondingbutton

for about 6 seconds.

• Probeanomalytest,whichistobesimulatedsimplybydisconnectingtheconcerned

probecableandcheckingthefollowingsignals:

InterfacePositive logicNegative logic

Led for failure (yellow)

of concerned probe

Off On

Alarmbuzzer Intermittent soundIntermittent sound

FailurerelayDe-energized Energized

 Oncethetesthasbeenmade,re-connecttheprobeandpresstheReset/Testbuttonto

restorethecontrolunittonormaloperation.

Normal operation

 Duringnormaloperationofthecontrolunit,boththemonitoringforgasalarmand

theself-diagnosisforplantanomalies(probes)andsystemsanomalies(controlunit)are

active.Inthisphaseandwithnoalarmsorfailures,thecontrolunitstatusisasfollows:

InterfacePositive logicNegative logic

Led (green)forpowersupply On On

Led for general failure(yellow) On Off

Led for probe failure (4)(yellow) On Off

Led for general alarm and (red)

line failure (4)

On Off

Alarmbuzzer No soundNo sound

Alarmrelay De-energizedEnergized

Failurerelay De-energizedEnergized

 Inpresenceofgasalarmorprobefailure,thecentralunitgoesintothesameconditions

describedintherelativestestphase.

REFERENCE STANDARDS

ConformitytotheEUdirectives

2006/95/EC(LowVoltage)

89/336/ECmodifiedby92/31/ECCand93/68/EEC(E.M.C.)

isdeclaredwithreferencetothefollowingharmonisedstandard:

EN 61779-1, EN 50270

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