User Manual

M07654Issue 8 April 2015

Tetra 3

Personal Multigas Monitor

Safety information:• Readandunderstandallinstructionsintheopera-tionsectionofthismanualbeforeuse.

• Donotsubstitutecomponentsasthismayimpairintrinsicsafetyandinvalidatewarranty.

• Observeallwarningsandinstructionsmarkedontheunitandwithinthismanual.

• Observe site health and safety procedures forgases being monitored and evacuation proce-dures.

• Makesureyouunderstandthescreendisplayandalarmwarnings.

• If this product is notworking properly, read thetroubleshootingguideorcallCrowcon.

• Ensurequalifiedservicepersonnelchangesensorsandoperatingsystem.

• Ensure maintenance and calibration are carriedout

Instructions specific for use in hazardous areas

Thefollowinginstructionsapplytoequipmentcoveredbycertificatenumbers:

Tetra3=Baseefa05ATEX0187

Tetra3=IECExBAS05.0059

Thefollowinginformationcoversallrelevantpointslistedinclause1.0.6oftheEHSR’softheATEXdirective.

1. Thecertificationmarkingisasfollows:

2. Theequipmentmaybeusedinzones1and2withgroupIIA,IIB,andIICflammablegases,tempera-tureclassesandvapoursT1,T2,T3andT4.

3. The equipment is certified for use in ambienttemperatures in the range –20°C to +55°C (-4to +131 F). The equipment should not be usedoutsidetheseranges.

4. Compliance with Essential Health and SafetyRequirements has been assured by compliancewithIEC60079-0,IEC60079-1,IEC60079-11,ascertifiedbyBaseefa.

Compliance with gas detection performancestandards EN 60079-29-1, EN 60079-0, EN60079-1andEN50104andEN50270hasbeencertifiedbyLloydsRegister.

5. Repairofthisequipmentandgassensorreplace-mentshallbecarriedoutbythemanufacturerorin accordancewith the applicable code of prac-tice.

6. If the equipment is likely to come into contactwithaggressivesubstances,thenitistherespon-sibility of the user to take suitable precautionsthatpreventitfrombeingadverselyaffected,thusensuring that the typeofprotection isnot com-promised.

7. Therechargeablebatterymustonlybechargedinnon-hazardous (safe) areasby connection to thespecifiedCrowconchargerpowersupply.

8. Theequipment isnot certified foruse in atmos-pherescontainingmorethan21%oxygen.

Area Classifications:

Zone1: AnareaclassifiedasZone1islikelytohaveignitableconcentrationsofflammablegases,vapoursorliquidspresentundernormaloperatingconditions.

Zone2: AnareaclassifiedasZone2isnotlikelytohaveignitableconcentrationsofflammablegases,vapoursorliquidspresentundernormaloperatingconditions.

©CopyrightCrowconDetectionInstrumentsLtd2015.

Allrightsarereserved.Nopartofthedocumentmaybephotocopied,reproduced,ortranslatedtoanotherlanguagewithoutthepriorwrittenconsentofCrowconDetection

Fromthe1stNovember2010,EN60079-29part1hasbeenharmonisedundertheATEXdirective94/9/EC.ThereforetocomplywiththeATEXdirective,portableapparatussensingflammablegasesshouldhaveafunctionalcheckwithgasbeforeeachdayofuse.Othertestingregimesmaybeemployeddependingonlocalcircumstances

Tetra 3 Personal Multigas Monitor

ContentsUnpacking.................................................1

Quickstartguide........................................2

I.Introduction............................................6

II.Operation..............................................8

III.Batteries.............................................12

IV.Alarmindications................................13

V.FixingAccessories................................14

VI.Flowsampling....................................15

VII.MaintenanceandCalibration.............20

VIII.PCinterfaceandsoftware..........................22

IX.i-modulereplacement.........................23

X.Specification........................................25

XI.Accessoriesandspareparts.................26

XII.Troubleshootingguide.......................28

Appendix:Limitationsofsensors..............29

1

Tetra 3 Unpacking

Tetra 3 Personal Multigas MonitorThankyouforpurchasingthenewTetra3PersonalMultigasMonitor.Tetra3hasredefinedportablegasmonitoringandwillgiveyouyearsofunparalleledserviceandreliability.

Please read the instructionscarefullybeforeuse.Keep themanual for futurereference.

UnpackingRemovetheTetra3PersonalMultigasMonitorfromthepackaging.TheTetra3accessorieswillbelocatedinthebottomofthebox.Checkthecontentsarecomplete,youshouldhave:

• Tetra3unit;

• Aconfigurationreportdetailingthesensorsinstalled,alarmsettingsandacalibrationcertificate;

• Optionalaccessoriessuchasaspiratorplate,aspiratorbulb,commslead,chargerandpowersupply.

Battery checkTheTetra3PersonalMultigasMonitorhasalithium-ionrechargeablebattery.Tetra3willoperateforaminimumof14hourswhenfullycharged.

Tetra3usesaLi-ionbatterypackandshouldarrivewithsufficientchargesothattheunitcanbeusedstraightoutthebox.However,ifthisisthefirsttimeyouhaveusedtheTetra3unit,youmayneedtochargethebatteriestoattainthefull14houroperatingtime.Theactualoperatingtimewilldependonthetypesofsensorsinstalled.

Warning: rechargeable unitsDonotattempttouseanyotherchargerwiththisunitexcepttheonesup-pliedbyCrowcon.Failuretocomplycouldinvalidatesafetycertificationandmayresultinpermanentdamagetotheunit.

2

Quickstart guide Tetra 3

Quickstart guide

1. Getting startedReview your Tetra 3 unit

Switching on your unitTetra3requireslittlesettingup,followthesesimplestepstogetyourunitreadyforuse.

1. Ensure the unit is in clean air.2. Switch on

Press and holdtheoperatorbuttonuntiltheredLEDflashes.

Theoperatordisplayscreenwilllightupandtheunitwillbeginawarmupsequence.

Operatorbutton

Pocketclip lever

Side view

Top view

Front plate

4 Alarm LEDs

Operator LCDdisplay screen

4 s

3

Tetra 3 Quickstart guide

Tetra 3 warm up sequence

a) TheunitwilltestthealarmLEDs,sounder,vibrationalerts,andtheoperatordisplayscreen.Thesoundermaybesilencedbypressingthebutton.

b) Theunitwillcontinuethroughawarmupsequenceasshownbelow,thiswilltakeapproximately45seconds.

c) Auto zero

Ifautozeroisenabled(default),theunitwilldisplaytheautozeromenu.Presstheoperatorbuttonwithasingleclicktoconfirmautozero.Iftheoperatorbuttonisnotpressedwithinthe10secondtimeout,Tetra3willproceeddirectlytoRunmodewithoutperformingzero.

LEDs Alarm testSounder Alarm test

Vibration test

O2

Tetra3

vs. 1.00

AUTO ZERO?Click toconfirmin 7 secs

iCH4 %LEL CO ppm

H2S ppm O2 %

CROWCONTetra3

Gas detection you ca.

TODAY ISWed5-Sep-200514:02:49

i

NEXT CAL

5-Jan-2005i

1-2 m

!

AUTO ZERO?

i

CH4 %LEL CO ppm

H2S ppm O2 %

0.0

0.0

0

20.9

No auto zero

Auto zero

OK

AUTO ZEROAuto zero inprogress0.0

AUTO ZERO

0.0 CH4

H2S

Co

O2

AUTO ZERO

0.0 CH4

H2S

Co

O2

Run mode

Click toconfirmin 7 secs

4

In the event of an alarm Tetra 3

Run mode

Yourunitisnowreadytouse.

BelowisatypicalscreendisplayshowingtheunitinnormalgasmonitoringRunmode.

Familiariseyourselfwiththegasesbeingmonitoredinyourunitandmakesureyouunderstandsitehealthandsafetyproceduresintheeventofalarmconditions.

2. In the event of an alarmAlarm signalsIntheeventofgasconcentrationsexceedingthealarmthresholdsforanygasbeingmonitored,Tetra3willactivatethealarmsignals.

Alarm signals

The red and blue alarm LEDswill flash, the sounder willemit a loud, fast series ofbeeps, the internal vibratoralarmwillactivate.Theopera-torscreenwilldisplaythegasin alarm and the alarm level.Seethefiguretotheleft.

CH4 %LEL CO ppm

H2S ppm O2 %

0.0

0.0

0

20.9

OK

OK

Flashing

icon, Tetra3

running

normally

Battery

Screen Icons

Auto zero

Warm up

Confidence signals

In normal Run mode, Tetra 3 will emit a short beep every 10 seconds and the OK icon flashes to show operational health.

O2

Gas example

under alarm

Alarm icon

CH4 %LEL CO ppm

H2S ppm %

0.0

0.0

0

16.7

2

O2

5

Tetra 3 Switching off

1. Whenthegaslevelreturnstonormal,presstheoperatorbutton.ThiswillresetyourTetra3unittonormalRunmode.Ifgaslevelsarestillinalarm,thebuttonwillhavenoeffect.

3. Switch off unit and storageSwitching off unit

1. Pressandholdthebuttonfor5seconds.Theshutdownmenuappears,continuetoholdbuttonuntiltheunitcountsdowntoshutoff.

Storing conditionsInordertooptimisesensorperformanceandlifetime,yourTetra3unitshouldbestoredinasafe,non-hazardousarea,0-30°C,10-90%RH.

4. Additional informationForbatteryrecharginginformationgotosectionIII.

ForfixingaccessoriesgotosectionV.

ForsamplingsectiongotosectionVI.

ForcalibrationinformationgotosectionVII.

FortroubleshootingguidegotosectionXII.

1 2

For any one gas, there are normally two alarm thresholds. These are indicated by the alarm icons shown.

The Tetra 3 alarm is set to latch by default. The unit will still continue in alarm mode even when gas levels return to normal, until the alarm is cleared, by pressing the operator button.

6

Introduction Tetra 3

I. IntroductionThankyouforpurchasingthenewTetra3PersonalMultigasMonitor.Tetra3isaportablemultigasdetector,designedtobecarriedorwornbyindividualsworkinginhazardousenvironmentssuchasconfinedspaces. It issuitableforuseinZone1and2hazardousareas.Tetra3canmonitoruptofourdifferentgasesanddisplaythereadingssimultaneouslyonadisplayscreen.Alarmwar-ningsaregiventhroughacombinationofaloudaudiblealarm,abrightvisualalarmofblue/redflashingLEDsandaninternalvibrator.Tetra3 isfittedwithmodular,plugandplaygassensors.Eachsensorcarriesanintelligentprocessorwhichcontainscalibrationandsensorinformation.

Tetra3isoperatedusingaLithium-ionrechargeablebattery.Achargerisavai-lablewitharangeofoptions.

AtCrowconwerecognisedtheneedforareliableandrobustpersonalmonito-ringsystem,whichisbothlightweight,compact,easytouseandcosteffective.Tetra3hasasingleoperatorbutton,andanintelligentuser-friendlydisplaywithbacklight.Gaslevelsarecontinuouslymonitoredprovidingnormalgasreadings,peakreadingsandtimeweightedaverages(TWA).Tetra3isadiffusionsamplinginstrumentwithanoptiontouseahand-operatedaspirator.Configurationanddata/eventloggingishandledbyCrowconPortablesPCsoftware,thePCcom-municationlinkbeingprovidedthroughthechargerinterface.

Tetra3’sshapeanddesignmakesitcomfortabletowearandasnon-intrusiveaspossible,withanon-slipgripforbetterhandling.Extraaccessories,suchasshoulderstrapandchestharness,canbepurchased.

Tetra3hasbeendesignedfromtoptobottomtobringyoueaseofuse,lowmaintenanceandextremelyhighreliability.Throughaninnovativeandrigorousdesignprocess,wehavecombinedseveralfeaturesfromourreliableTetraandGasmanproductstoproducethenewTetra3.

i-module gas sensorTetra3usesuniqueplugandplayi-modulesensortechnology.Eachsensorunitincorporates its own intelligent processor holding sensor configuration andcalibrationdata.Differentsensormodulescanbepurchased,andonceinserted,areimmediatelyreadytorun.Tetra3canoperatewithuptothreesensorsanddisplay simultaneously, informationandgas readings, forall thesensors,ononescreen.ThismeansnoredundancyandassuredfutureinvestmentinyourTetra3unit,allowingyoutoswapsensorsbetweenunitsorconfigureyourunit,asappropriate,toyourcurrentneeds.Plugandplaywilleasemaintenancetime

7

Tetra 3 Introduction

andcost,andtheintelligentmodularsystemwillremovetheneedtocalibrateeachsensor.Additionali-modulescanbepurchased,pre-calibratedfromyourlocalsupplier.

Reliable, anti-shock mechanics and robust housingTheTetra3housingisbuiltfromresilientmaterial,givingitstrengthandflexi-bilitytowithstandthehardestofworkingconditions,wateranddusttighttoIP65andIP67,andwithanon-slipgrip.Thecasehasbeencarefullydesignedtomakeservicingeasyandatthesametimeveryrugged.Iftheunitisdropped,therewillbenodisruptionofpowerorfunction,ensuringreliabilityandserviceforyearstocome.

SoftwareTheprocessesusedtodesignanddeveloptheTetra3softwareensureahighdegreeof reliabilityand robustness. ThusTetra3hasbeendesigned tobeatrulyreliablepersonalgasmonitoringsystem.Theinternalcircuitryincludesanexternalwatchdog,where the softwaremonitors for anymalfunctionwithintheunitandwilldisplayanerrorwarningtotheusershouldtheyoccur.

8

Operation Tetra 3

II. Operation

2.1 Switch-on sequence1. Ensure the unit is in clean air.2. Switch onPressandholdtheoperatorbuttonuntilthetworedLEDsflash.

TheinstrumentbeginswithtestingalltheLCDsegmentsontheoperatordisplayscreen,theredandbluealarmLEDs,sounderandinternalvibratoralertforabout5seconds.Thesoundermaybesilencedbypressingthebutton.Theunitentersawarmupmodeanddisplaysasequenceofscreens,seepage3formoredetails.Attheendofwarmup,theautozeromenuwillbedisplayed.

3. Auto zero menuPresstheoperatorbuttonwithasingleclicktoconfirmautozero.Iftheoperatorbuttonisnotpressedwithin10seconds,Tetra3willproceeddirectlytoRunmodewithoutperformingazero.Flammableandtoxicsensorswillbesettoreadzeroandtheoxygensensortoread20.9%.

NB. If auto zero fails, a warning message will be displayed and an ‘X’ will appear against the sensor that has failed.

Switch off Toswitchofftheunit,pressandholdtheoperatorbuttonfor5seconds.Ashut-downmenu‘OFFIN’willappear.Continuetoholdbuttonuntiltheunitcountsdowntoshutoff.

Battery checkUsethistimetocheck

thereissufficientchargeinthebatterypack

!The auto zero function can be disabled or set to run automatically, without user confirmation: auto zero menu will not appear. See section VIII PC Interface and software.

NB. During the warm up sequence, the date for next calibration will be displayed. If the date has expired or has passed, the Tetra 3 unit will display a warning message that calibration is due. The instrument can still function, but it is strongly recommended the unit is sent for calibration as soon as possible.

Tetra 3 can be set, using the Portables PC software, for the instrument to shut down automatically, if the calibration date is passed, to prevent further operation of the instrument.

9

Tetra 3 Run mode

2.2 Run modeTheTetra3unitwilldisplayuptofourgasreadingssimultaneouslyontheope-ratordisplayscreen.Atypicalfourgasdisplayisshownbelow.

Eachchannelwilldisplaythegasname,unitsandcurrentvalue.Familiariseyourselfwiththegasescurrentlybeingmonitoredinyourunit.Ensureyouunderstandsitehealthandsafetyprocedures.ForinformationonpeakandTWAreadings,gotosection2.4.

Confidence signals

To reassure users the unit is working correctly, the Tetra 3 unit will emit a short beep every 10 seconds and the OK icon will flash.

2.3 Display symbol guideBatteryAfullbatteryisrepresentedbyabatteryiconshowingafullsixbars.Alowbatterychargewillshow1to2bars.Whenzerobarsareshownthebatteryiconflashes.Thesounderwillemitwarningbleeps.

Ifthebatterybecomestoolow,Tetra3willdisplaya‘Batterylow’warningmessageandswitchoff.

TWA alarm Tetra 3will display the TWA alarmwhen the 15minute or8hour timeweightedaveragealarm threshold ispassed fortoxicgases.

CH4 %LEL CO ppm

H2S ppm O2 %

0.0

0.0

0

20.9

OK

OK

Flashing

icon, Tetra3

running

normally

Battery

Screen Icons

Auto zero

Warm up

!Full

10

Display options Tetra 3

2.4 Display optionsTetra3providestwoadditionalselectabledisplays:

Peak display WhenPeakmodeisselectedtheinstrumentshowsthehighestvalueforflammableandtoxicgasesandthelowestvalueforoxygensincetheunitwasswitchedonorsincethelastpeakclear.

After5secondsthescreenwilldisplay'PeakClear'.Ifyoupressthebuttonwithinthe10secondcountdown,thepeakvalueiscleared.Ifthebuttonisnotpressed,thedisplaywillreverttothestoredpeakvalue.

WhilstinPeakmode,newhighergasvaluesarestored.UponexitofPeakmode,thestoredpeakvaluesarenotdeleted.

Thisisusefulforverticalentrycheckswhereawholeinstrumentcanbelowereddowntheshaftratherthanjustasamplingtube.

TWA display Showsthe8hourtimeweightedaverage(TWA),fortoxicgases,monitoredsincelastturnon.

1. Toviewtheadditionaldisplayoptionmenu,double-clicktheoperatorbutton.

2. Presstheoperatorbuttonwithasingleclicktoscrollthroughthelist.Whenyourchoiceishighlighted,double-clicktheoperatorbutton.

TheTetra3operatorscreenwilldisplaythepeakorTWAiconandthegasreadingsrecorded.

10

CH4 %LEL CO ppm

H2S ppm O2 %

0.0

0.0

0

20.8

OK

GasPeakTWA

Zero

0

Gas

ZeroTWAPeak

1. Scroll 2. Select ppm

%

0

20.8

OK

Peak display

11

Tetra 3 Event logging

11

Zero

TheTetra3instrumentcanperformanautozerobyselectingtheZerofunctionfromthemenu.WhenZeroiscompleted,theinstrumentwillreturntonormaloperation.

2.5 LoggingTetra3incorporatesdataandeventloggingwhichcanbeaccessedusingthecommunicationslinkwithPortablePCsoftware.SeesectionVIII.

TheTetra3eventlogrecordsthetimeanddateforanumberofoperatinganddiagnosticeventsincluding:

• Switchonandswitchoff;

• Level1,Level2andTimeWeightedAverageAlarms,alarmon,alarmoffandthepeaklevelduringthealarm;

• Zero,calibrationandgastestwithsuccessorfailure;

• Pellistorsaveronandoff;

• ThebatteryconditionisloggedeverytimetheTetra3isswitchedonoroff,andwhenitisplacedintoorremovedfromthecharger;

• Dataloggingrecordsreadingsetsdataatapredeterminedtimeinterval,usuallysettooneminute.

12

Batteries Tetra 3

III. Batteries

3.1 Rechargeable batteriesTetra3usesa rechargeable Lithium-ionbatterywhichmustonlybe chargedusingaCrowconbatterycharger.A5hourrechargefromflatwillprovideatleast12hoursoperatingtime.Afullychargedbatterywillprovidemorethan14hoursofcontinuoususe.

Charging the batteries1. Ensure you are in a safe area. 2. Plugthechargerpowersupplyintoamainssocket.

3. Connectthepowersupplytothecharger.InserttheTetra3intothecharger.

Switchonthecharger'spowersupply.

Theunitwouldnormallybeleftswitchedoffforcharging.WhenchargingiscompletetheredLEDisextinguished.(EarlyunitshadagreenLEDilluminateoncompletionofcharge).Iftheunitisswitchedonduringchargethenormaldisplaybatteryiconsweepsfromemptytofull.Ondisconnectingthechargerpowersupplythisdisplayiconwillupdatein20secondstoshowactualchargestate.

InRunmode,thebatteryiconwilldisplaysixbarswhenitisfull.

4. RemovetheTetra3fromthechargerandswitchontouse.

Communicationssocket

Battery full

Low battery

Battery needs

recharging25

iWARNING

Tetra warning messageBattery fully charged

The charging time will be longer if the unit is switched on during charging.

13

Tetra 3 Alarm indications

IV. Alarm indicationsTetra 3 provides two instantaneous alarm levels for each installed sensor,designated level1and level2.For toxicgassensors, therearealsotwotimeweightedaveragealarms(TWA),oneforshorttermexposure(STEL):basedona15minutetimeweightedaverage,andthesecondTWAalarmisforlongtermexposure:basedona8hourtimeweightedaverage.

AlarmconfigurationsaresetviatheCrowconPortablesPCsoftware.

Thefollowingsettingscanbemade:

Alarm thresholds for each sensor: Level1andlevel2alarmscanbesetforeachindividualgassensor.

Alarm type: This canbe set to rising levelsofgasconcentration,orasfalling.Oxygenaresettofallingfordeficiencymonitoringasadefault.

Alarm latching:Alarmscanbesettobe latchedorunlatched.Latchedalarmswillrequiretheoperatorbuttontobepushedinordertoclearthealarm.Thisisthedefaultsetting.Unlatchedalarmswillclearautomaticallywhenthegashazardhaspassed.

Alarm mute: The sounder can be set to mute for level 1 alarm only;pressing theoperatorbuttonduringanalarmcondition i.e.presenceofhazardousgas,willsilencethesounderandstopthevibrationalarm.ThealarmLEDswillcontinuetoflash.

Alarm sounder tone:Differenttonescanbeselectedtoachievethebestperformanceforthemonitoringconditionsavailable.

In the event of a Time Weighted Alarm (TWA)Intheeventthe15minuteorthe8hourTWAistriggered,Tetra3willgointoalarmanddisplaytheTWAiconwiththetoxic gas readings. Neither the 15minute alarm or 8 houralarmcanbecleared.

1 2

14

Fixing Accessories Tetra 3

V. Fixing Accessories

Belt clipTetra3hasastrongalligatorclip locatedonthebackoftheunit.Liftingthesmallleverwillallowtheunittobeattachedtoabeltmoreeasily.

Universal harness plateCrowcon provide a universal harness platewhich can be usedwith either achestharnessorashoulderstrap.

How to wear your Tetra 3 unit

Chest harnessUsetheM3fixingonthebackof your Tetra 3 unit to attachthechestharnessplate.Createa chest harness by attachingone strap to the top connec-tors, to go around the neck,and the other to link aroundthe waist using the side con-nectors. Adjust the lengthsuntil the Tetra 3 unit is in acomfortableworkingposition.

Shoulder strapWiththeuniversalharnessplateinplace,attachtheshoulderstrapaccessoryontothetopconnectors.Adjusttoacomfortableworkingposition.

Seeaccessories,sectionXI,forfulllist.

Shoulder/neck

connectors

Universal harness plate

15

Tetra 3 Flow sampling

VI. Flow sampling

Attaching the flow adaptor plateToperformmanualsamplingusingTetra3,aflowadaptorplatemustbefittedontothefrontoftheinstrument.

1. Tofittheflowadaptorplate,cliptheplateinplaceoverthesensorgrillsandscrewthethumbscrewuntiltheplateistightlyfittedintoplace.

2. Attachthesamplingtubeorflowaccessoryontothegasinletnozzle.

3. Attachtheaspiratorbulbontothegasoutletnozzle.

4. Toremovetheflowadaptorplate,unscrewthethumbscrewandlifttheplateawayfromtheinstrument.

Flow adaptor

Gas in

Gas out

The sampling tube supplied is normally a 2m (6ft) length. Longer lengths of sampling tube can be provided, but will increase the time taken to get a sample from the point of sampling to the Tetra 3 instrument. When using an extended length of tubing a response time test is recommended. Gas of known concentration should be sampled along the full length of tubing to be used and the time taken for the sensor reading to reach the known gas levels should be noted. This time should be used as the minimum for sampling before readings should be taken.

16

Flow sampling Tetra 3

Diffusion instrumentsWhenusingthemanualaspiratorkit,adoptaconsistentstylewhilstusingthehandaspirator.Crowconrecommendsqueezingoncepersecondtoachieveaflowrateofapproximately0.5-1litre/min.Atleast10pumpspersamplearerecommended.

17

Tetra 3 Gas testing

Tetra 3 gas test accessory kitTheGasTestAccessory isagastestingkitdesignedtoenablegastestingoftheTetra3multigasdetectorusingaspeciallyformulated,highstabilitylonglifequadgasmix.ItcanbeusedwithTetra3unitshavingsensorsforFlammable,Oxygen,CarbonMonoxideandHydrogenSulphidegases,andallTetra3unitswiththesesensorscanbegastestedusingthekit.

6.1 Gas testingGastestingchecksthesensorisrespondingwithinsetlimitstoanappliedgasofknowncomposition.Thiscanbeperformedasoftenasdesired,butwouldusuallybecarriedouteachtimetheTetra3isissuedforuse.TheTetra3itselfwilldeterminePass/Failstatusforthegastest.

Inordertoperformsuccessfulgastestsensure:

• Thequadgasmixtureusedhasthecorrectgasconcentration,andthatitiswithinthevaliditydatespecifiedbythesupplier.

• Thegasflowpathisleaktight.ItisimportanttocheckthattheflowplateisproperlyfittedtotheTetra3,andtheoutlettubingisnotrestrictedinanyway,noradditionaltubinglengthused.

TheGasTestAccessoryKitcomprises;agascylindercontainingthequadgasmix,a'Trigger'regulatorwithinterconnecttubing,amagnet-usedtoactivateTestmode,anaspiratorplatetoattachtotheTetra3andaventline.TheTriggerregulatorcanbeoperatedintwoways:(1)squeezeandhold-allowsgasflowaslongastheleverisheldin,or(2)byliftingthelever-theflowislockedon.

6.2 How to perform a gas test1. EnsureyourTetra3unitisswitchedonandinnormaloperation.

2. CliptheflowplateontothefrontoftheunitandattachthehosefromtheTriggerregulator.

Attachtheoutlethoseto‘ventgasaway’-donotextendthishoseanddonotrestrictorallowkinks.

3. Swipethemagnetoverthebubblelabelonthefrontoftheunit,nearthemainbutton.YourTetra3willbegintheGasTestandshow'GASTEST'onthedisplay.Acountdownprogressbarwillalsoappearatthebottomofthedisplay.

4. OperatetheTriggerregulatorandapplygastotheTetra3whilsttheprogressbariscountingdown.

18

Field calibration Tetra 3

5. Waitfortheprogressbartocomplete(typically30-45seconds).Apassorfailmessagewillappear.Tocontinueusingtheinstrument,disconnectthetestgasandpressthemainbutton.Thiswillreturntheunittoitsnormaloperatingmode.(Theunitiscomparingwhatitmeasuresfromthebottlewiththestandardgasvaluesitknowsshouldbeinthebottle.)

6.3 How to perform a field calibration testTo perform a field calibration test, youmust first Zero your Tetra 3 unit 15minutesorlessbeforecommencingthegastestinstructions.

1. Followsteps1to3givenin6.2,Tetra3willdisplayanalternatescreenmessage:

Calibrate?Click toConfirm

In 10 seconds

2. Pressthebuttonwithin10secondstoconfirmCalibration.

Ifthebuttonconfirmationforcalibrationisnotmadewithin10secondsthentheprocesswillreverttogastestasin6.2.

3. Applycalibrationgasfollowingstep4in6.2.

Tetra3willdisplayaprogressbaratthebottom,thenamesofthegassensorsfittedareshowninreverseimagewithacrossbesideeach.

OperatetheTriggerregulatorandapplygastotheTetra3whilsttheprogressbariscountingdown.

AsgasflowstheTetra3allowsthesensorstorespondandthenadjustthevalueforeachgaschanneltomatchthestoredcalibrationgasvaluewithineachsensori-module.Providedallchannelscalibratesuccessfullywithintheallowedtimethecalibrationwillbedesignatedsuccessful.Ifanychanneldoesnotcalibratesuccessfullyitwillremainmarkedwithacrossandscreenamessage‘Gastestfailed’and‘Sendforcalibration’willbedisplayed.Atickwillappearagainsteachchannelastheunitpassesthetest.

4. ToaborttheCalibrationtestpressthebuttonatanytimewhilstthetestisinprogress.

6.4 Cal/TestThiscanarise ifhavingselectedandconfirmedcalibration,oneormore(butnotall)ofthesensorsarenotcalibrate-enabled.Inthiscasecalibrate-enabledchannelswillcalibrate,andnon-enabledchannelswillGasTest(bump)only.

19

Tetra 3 Gas test/calibration troubleshooting

Oxygensensorsarebydefaultnotcalibrate-enabled,astheyarecalibratedto20.9%infreshairinZeroing.

6.5 Gas test/calibration troubleshootingSymptom Possible Cause Action

Noresponsetogas Gascylinderempty Checkgauge,replacecylinderasneeded

Hoseblockedorkinked Ensurenorestrictiontoflow

Tetra3failsgastest Gascylinderempty Checkgauge,replacecylinderasneeded

Gascylinderoutofdate Checkdateandreplaceasneeded

Hoseblockedorkinked Ensurenorestrictiontoflow

Calibrationdrifted CalibrateTetra3

Gasflownotstartedimmediately

Repeattest,startinggasimmediately

Tetra3failscalibration

Gascylinderempty Checkgaugereplacebottleasneeded

Gascylinderoutofdate Checkdateandreplaceasneeded

Hoseblockedorkinked Ensurenorestrictiontoflow

Calibrationdrifted CalibrateTetra3

tabilisationtimetooshort ResetusingPCsoftware

Tetra3passesgastestbutwillnotentercalibrationmode

MenuZeronotperformedFieldcalibrationnotenabledinTetra3unit.

SelectZerofrommenu

Sendforre-configuration

Note:Removeregulatorfromgascylinderwhennotinuseoveraprolongedperiod.Forpartslist,seesectionXI.

20

Maintenance and Calibration Tetra 3

VII. Maintenance and CalibrationTetra3isdesignedtooperatealmostmaintenancefreeundermostconditions.However,somesmallitemsofroutinemaintenancearerecommended.

GeneralTokeepthedisplaypanelandoperatorbuttonfreefromdirtbuildup,regularlywipeoveryourTetra3unitwithadampcloth.

Zero and calibrationTetra3 is suppliedwithanautozero functiononstart-up.This functioncanbeconfiguredtooperateautomatically,onuserconfirmation(seequickstartguide), or can be disabled. This configuration can be setwith theCrowconPortablesPCsoftware,seesectionVIII.Tetra3alsohasazerofunctioninthemenu.SeesectionII,item2.4.

Crowcon recommends,asaminimum,amonthlygas test toconfirmsensoroperation. A test gas of known composition, needs to be applied, to verifysensorresponseandalarmfunction.

Instrumentcalibrationofallsensorsshouldbeperformedatregular6monthlyintervals.

Calibration methodTetra3calibrationcaneitherbeperformedusingthePortablesPCsoftwareorbyuseoftheGasTestAccessoryKit.UsingthePortablesPCsoftwareallowscalibrationusingeithersinglegasmixtures,andcalibratingeachsensorinturn,orusingamultigasmixtureforsimultaneouscalibration.TheGasTestAccessoryKitallowscalibrationonaquadgasmixtureforthestandard4gascombina-tionsofflammable,oxygen,carbonmonoxideandhydrogensulphide.

Ozone Detector CalibrationsDuetothereactivenatureofozone(O3)specialproceduresshouldbefollowedwhencalibratinggasdetectorsthatincorporateanozonesensor.Byfollowingtheguidelinesforcalibrationbelowuserswillmaximisetheprotectionlevelthattheirgasdetectorsgivethem.

AlwayscalibrateCrowconozonedetectorswithozoneonly.

Before opening the instrument case to change any internal components, it is essential to take precautions to ensure ESD protection.

21

Tetra 3 Maintenance and Calibration

Fittings:Forozonecalibrationsallfittingsandpipeworkshouldbestainlesssteel,brass,aluminiumorPTFE.FittingsorpipeworkinotherplasticmaterialssuchasTygonmustnotbeused.

Gas flow rate:It is importantthattheflowrate issetcorrectlyasotherwisepressureeffectsmay distort calibration values and prevent the gas detector from workingcorrectly.TocalibrateCrowconportabledetectorstheflowrateshouldbesetbetween0.8-1.0litres/minute(0.03-0.04cubicfeet/minute).

Normalsafetyprecautionsforhandlingozoneshouldalwaysbeobservedalongwith any special instructions that accompany the calibration gas cylinder orgeneratorbeingused.

Calibrate using the special ozone flow plateForcalibratingtheozonesensorthespecialflowplatemarked“OzoneOnly”(partnumberS012975)shouldbeused.Notethatthestandardflowplatemustbeusedforcalibratingtheothergassensors.

Using a new ozone i-module sensor assemblyThisnoteappliestoozonei-moduleassembliesS011432/Monly.

Ensuresparei-modulesarealwayszeroedincleanairbeforeuse.

Afterinstallingthei-module,switchontheunitincleanairandautozeroonstart-up.

Ifautozeroisdisabledonstart-up,autozerousingthefrontpaneldisplaymenu.

FordetailsonhowtoautozeroseeQuickstartguide,p3.

22

PC interface and software Tetra 3

VIII. PC interface and softwareTetra3canbeconnectedtoaPCusingthesinglewaychargerunitwithoptio-nal PC interface. The charger unit is fittedwith aD-type 9 pinmale RS232socketwhichislocatedattherearofthecharger,seediagrambelow.ThePCrequiresCrowconPortablesPCsoftware.AUSB-RS232adapterisalsoavailablefromCrowcon.

Thesoftwareprovidestheuserwithaccesstoreconfigurealarmlevels,opera-tion,runcalibrations,printreportsandtoaccessdataandeventlogfiles.

Set-up1. InstallPortablesPCsoftwareonPCandattachtheRS232cabletothechargerandPC.

2. SwitchontheTetra3unitanddropitintothechargerunitensuringitisuprightandthedisplayisfacingforward.

3. OpenthePortablesPCsoftwareandeitherusetheWizardortheEngineer’sForm,selectTetra3anduploadtheconfiguration.

FormoreinformationonusingtheCrowconPortablesPCsoftware,seeinstal-ledhelpfile.

23

Tetra 3 i-module replacement

IX. i-module replacementBefore opening the instrument case to change any internal components, it is essential to take precautions to ensure ESD protection.

1. Ensureyouareinanon-hazardous(safe)area.

Switch off the unit2. Removeanyaccessories,suchastheflowadaptor,iffitted.

3. RemovethecoverbyunscrewingthefourM3screwsasshowninthedrawing,point

Withcare,withdrawthebatterywithplasticholderdownwards.

Removing an installed i-module

1. Locatethei-moduleconnectionribbon,squeezethetworetaininglugs,onthei-moduleboard,towardeachotherandpulloutslightly,thiswillreleasetheribbon.

1

24

i-module replacement Tetra 3

2. Gentlypullthei-moduleoutoftheunit.Theremaybesomeresistanceatfirst,asthesealbetweenthesensorandthefrontcaseisbroken.

Installing or replacing an i-module

If replacing an i-module with one of the same type, instrument specific configuration will be retained. If replacing with a different i-module its default configuration will be loaded.

1. Unwrapthei-modulefromanypackaging.

Ifyouareinstallinganewi-moduleintoacurrentlyunusedslot,youwillfirstneedtoremovethedummyi-module.Followthei-moduleremovalinstructionstodoso.

2. Ensurethegasketisinplaceinthesensor.Placethenewsensorinthevacantspaceandpushdowngently.

3. Attachtheribbonconnectorbysqueezingthetworetaininglugs,onthemoduleboard,towardeachotherandpullingoutslightly.Slidetheribbonintotheslot.Pushtheretaininglugsbacktowardthesensor,thiswillgriptheribbonfirmly.

4. Ifusingadualsensor,alwaysplacethisintheslotnearesttothedisplay.

WarningDonottwisttheconnectionribbons.

Donotpullthei-modulestoofarfromthePCBboard,topreventdamagetothecablingorelectricalconnections.

Re-assembling the Tetra 3 unit1. Ensurethatalli-modulesareseatedintheircorrectpositionsandallribboncablesarefoldedneatlybetweenthei-modulesandthemainunit.Putthebatteryandplasticholderbackintotheiroriginalpositions.

2. SwitchonyourTetra3unit.Thenewsensorwillbeautomaticallyidentified.

Check the filters are clean and gaskets are all in good condition. Replace if any items are faulty.

Refer to the troubleshooting guide if necessary.

25

Tetra 3 Specification

X. Specification

Dimensions 71x114x48mm(2.8x4.5x1.9inches)

Weight 295gunit,includingpocketclipand3sensors.

Housing,degreeofprotection IngressprotectionIP65IP67

Operatingtemperature -20°Cto+55°C(-4°Fto+131°F)

Humidity 15-90%RH,non-condensingforcontinuousoperation

Display 128x64pixel

Warmuptime 45secondsapproximately

Responsetime(typical) (T90):approx.20secondsformosttoxicsensors,10secondsforoxygen.

Repeatability ±2%FSD,6months

Explosionprotection IntrinsicallySafe

ATEX EssentialHealthandSafetyRequirement,clause15.9

Safetycertificateno. Baseefa05ATEX0187IECExBAS05.0059

Approvalcodes

Europe: ATEXII2GExiadIICT4Gb-4°F/-20°C≤Ta≥131°F/55°C

Canada: ClassIDivision1GroupsA,B,C,D

Standards

Safety: EN60079-0,EN60079-1,EN60079-11IEC60079-0,IEC60079-1,IEC60079-11

Canada: CSA22.2,152

Operation EN50270,EN50271

26

Accessories and spare parts Tetra 3

XI. Accessories and spare parts

Accessory listCrowcon part number Description

S011952 AspiratorassemblyC011062 Tetra3gastestaccessorykitFortestandcalibrationgasescontactCrowcon,astherequiredgasesdependuponyoursensorcombination.

Single way chargers

C011018 12VDCinputsinglewaycharger,nopowersupplyC011020 Singlewaychargerwith230VUKstylepowersupplyC011021 Singlewaychargerwith230VEURstylepowersupplyC011022 Singlewaychargerwith110VUSstylepowersupplyC011023 Singlewaychargerwith90-260VinlinepowersupplyC011035 Singlewaychargerwith230VinlinepowersupplyC011036 Singlewaychargerwith110VinlinepowersupplyC01296 VehiclelightersocketleadC011019 Singlewaychargerinterface,nopowersupplyC011024 Singlewaycharger/interfacewith230VUKstylepowersupplyC011025 Singlewaycharger/interfacewith230VEURstylepowersupplyC011026 Singlewaycharger/interfacewith110VUSstylepowersupplyC011027 Singlewaycharger/interfacewith90-260VinlinepowersupplyC011037 Singlewaycharger/interfacewith230VinlinepowersupplyC011038 Singlewaycharger/interfacewith110VinlinepowersupplyC011149 Universalchargerwithmultiregionpowersupply

i-modules:

S011424/M 0-100%LELmethaneS011436/M 0-100%LELpropaneS011437/M 0-100%LELpentaneS011439/M 0-100%LELbutaneS011440/M 0-100%LELethyleneS011423/M 0-25%oxygenO2,2-yearlifetimeS012004 0-25%oxygenO2,3-yearlifetimeS011421/M 0-100ppmhydrogensulphideH2SS011422/M 0-500ppmcarbonmonoxideCOS011953/M 0-50ppmH2S/0-500ppmCOduali-module.

27

Tetra 3 Accessories and spare parts

S011460/M 0-100%LELhydrogenS011432/M 0-1ppmOzone03S011425/M 0-20ppmSulphurDioxideS011435/M 0-100ppmAmmonia*Therearealternativeflammablesensorsfordifferentapplications.ContactCrowconwiththeinstrumentserialnumbertocheckcorrectsensortype..

Sampling accessories:

S011952 AspiratorplateM04897 AspiratorplateandgasketC01757 TelescopicaspiratorprobeC01097 3footsampleprobeM04032 Aspiratorhose(pleasespecifylengthinmetres)C03328 6mdroplineC01245 WatertrapS012975 O3calibrationadaptor

Carrying and wearing:

C01952 UniversalharnessplateC01843 ShoulderstrapC01844 Chestharnessstrapkit

Communications:

E07532 PCinterfaceheadC02097 USBtoRS232adaptorC01832 PortablesPCsoftwareCD

Spares / consumables:

S012047 BatterytrayassemblyincludingbatteryC01851 AspiratorbulbC01853 DummysensormoduleM04482 i-moduleO-ringseal

28

Troubleshooting guide Tetra 3

XII. Troubleshooting guide

Symptom/ Cause Action error messageInstrumentwon'tswitchon Flatbattery Rechargeorreplacebattery.

Noconfidencebeep Functiondisabled ReconfigurewithPCsoftware.

Gasreadingwhennogas Zerodrifted. Restartinstrumentincleanpresent air.

Unstable/inaccurategas Sensorfailure Donotuse;exithazardousreading areaimmediately.Return instrumentforrecalibration orsensorreplacement.

Autozerofailed Zeroingin Switchoffandrestartin contaminated cleanair. atmosphere

CannotAutozerodueto Zeroingin Switchoffandrestartinalarm contaminated cleanair. atmosphere

Calibrationexpired Thecalibrationdue Sendforcalibration. datehaspassed

LCDtoofaint/dark Contrastsetting AdjustusingPortables wrong PCsoftware.

Fatal/Auto shut

Service

Configuration

User alert

Calibration

29

Tetra 3 Appendix: Limitations of sensors

Appendix: Limitations of sensors

Sensor limitationsThesensorsused inTetra3have limitationscommontoallsuchgassensors,andusersshouldbeawareofthepointslistedbelow.Crowconcanadviseonparticularsituationsandsuggestalternativesensorsiftheinstrumentislikelytoexperienceextremeconditions.

Tetra3usesacatalyticflammablegassensor,whichmeasurestheflammabilityofthegas.Forthisreason,readingsdisplayedontheunitwillbeunreliableoverconcentrationsofapproximately120%LEL.Oxygen isnecessary for catalyticsensorstooperate.A'pellistorsaver' isusedtodisconnectpowertothepel-listorsensorintheeventofover-rangetopreventburnout.Thislocksoutfor200secondsafterwhichabuttonpresswillreconnectpowertothepellistor.Ifthesensorpowerisreconnectedwhentheunitisexposedtoanover-rangegasconcentrationthereisariskofdamagetothepellistorsensor.Restartshouldbecarriedoutinaknownfreshairenvironment.Depletedoxygenlevelscanredu-ce the flammablegas reading,and ifoxygen levelsarebelowsafebreathinglimitsitshouldbeassumedthattheflammablereadingislow.

Electrochemicalgassensorscontainchemicals.Extremelevelsofhumiditycanalsocauseproblems.Thesensorsareratedforan(average)ambientof20-90%R.H.Howevertheyareusedfromthetropicstodesertstotundrawithoutthisnormallybeingaproblem.

Watershouldnotbeallowedtocollectonthesensorsasthismayimpedegasdiffusion.

Persistent exposure to high levels of toxic gas will shorten the life of toxicsensors.Ifthehighlevelgasiscorrosive(e.g.hydrogensulphide)damagemayoccurovertimetometalcomponents.

Sensorsmaybecrosssensitivetoothergases. Ifunsure,contactCrowconoryourlocalagent.

UK OfficeCrowconDetectionInstrumentsLtd172BrookDrive,MiltonPark,AbingdonOxfordshireOX144SDTel:+44(0)1235557700Fax:+44(0)1235557749Email:sales@crowcon.comWebsite:www.crowcon.com

USA OfficeCrowconDetectionInstrumentsLtd1455JamikeAve,Suite100ErlangerKY41018Tel:+18599571039or18005276926Fax:+18599571044Email:salesusa@crowcon.comWebsite:www.crowcon.com

Netherlands OfficeCrowconDetectionInstrumentsLtdVlambloem1293068JG,RotterdamNetherlandsTel:+31104211232Fax:+31104210542Email:eu@crowcon.comWebsite:www.crowcon.com

Singapore OfficeCrowconDetectionInstrumentsLtdBlock194,PandanLoop#06-20PantechIndustrialComplexSingapore128383Tel:+6567452936Fax:+6567450467Email:sales@crowcon.com.sgWebsite:www.crowcon.com

China OfficeCrowconDetectionInstrumentsLtd(Beijing)Unit316,Area1,TowerB,ChuangxinBuilding12HongdaNorthRoad,BeijingEconomicTechnologicalDevelopmentAreaBeijing,China100176Tel:+861067870335Fax:+861067874879Email:saleschina@crowcon.cnWebsite:www.crowcon.com