personal multigas monitor
TRANSCRIPT
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.
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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
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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
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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:[email protected]:www.crowcon.com
USA OfficeCrowconDetectionInstrumentsLtd1455JamikeAve,Suite100ErlangerKY41018Tel:+18599571039or18005276926Fax:+18599571044Email:[email protected]:www.crowcon.com
Netherlands OfficeCrowconDetectionInstrumentsLtdVlambloem1293068JG,RotterdamNetherlandsTel:+31104211232Fax:+31104210542Email:[email protected]:www.crowcon.com
Singapore OfficeCrowconDetectionInstrumentsLtdBlock194,PandanLoop#06-20PantechIndustrialComplexSingapore128383Tel:+6567452936Fax:+6567450467Email:[email protected]:www.crowcon.com
China OfficeCrowconDetectionInstrumentsLtd(Beijing)Unit316,Area1,TowerB,ChuangxinBuilding12HongdaNorthRoad,BeijingEconomicTechnologicalDevelopmentAreaBeijing,China100176Tel:+861067870335Fax:+861067874879Email:[email protected]:www.crowcon.com