Crowcon Tetra 3 User manual

Tetra 3
Crowcon
Brand
Crowcon
Model
Tetra 3
Category
Carbon monoxide (CO) detectors
Type
User manual

Crowcon Tetra 3 is a portable multigas detector designed to protect individuals working in hazardous environments. It can simultaneously monitor up to four different gases and display readings on its screen. It features audible and visual alarms, including bright flashing LEDs and a loud sounder, as well as an internal vibrator to alert users to dangerous gas concentrations. Tetra 3 is suitable for use in Zone 1 and 2 hazardous areas and can operate for a minimum of 14 hours on a single charge.

Crowcon Tetra 3 is a portable multigas detector designed to protect individuals working in hazardous environments. It can simultaneously monitor up to four different gases and display readings on its screen. It features audible and visual alarms, including bright flashing LEDs and a loud sounder, as well as an internal vibrator to alert users to dangerous gas concentrations. Tetra 3 is suitable for use in Zone 1 and 2 hazardous areas and can operate for a minimum of 14 hours on a single charge.

User Manual
M07654
Issue 8
April 2015
Tetra 3
Personal Multigas Monitor
Safety information:
• Readandunderstandallinstructionsintheopera-
tionsectionofthismanualbeforeuse.
• Donotsubstitutecomponentsasthismayimpair
intrinsicsafetyandinvalidatewarranty.
• Observeallwarningsandinstructionsmarkedon
theunitandwithinthismanual.
• Observe site health and safety procedures for
gases being monitored and evacuation proce-
dures.
• Makesureyouunderstandthescreendisplayand
alarmwarnings.
• If this product is not working properly, read the
troubleshootingguideorcallCrowcon.
• Ensurequalifiedservicepersonnelchangesensors
andoperatingsystem.
• Ensure maintenance and calibration are carried
out
Instructions specific for use in hazardous areas
Thefollowinginstructionsapplytoequipment
coveredbycertificatenumbers:
Tetra3=Baseefa05ATEX0187
Tetra3=IECExBAS05.0059
Thefollowinginformationcoversallrelevantpoints
listedinclause1.0.6oftheEHSR’softheATEX
directive.
1. Thecertificationmarkingisasfollows:
2. Theequipmentmaybeusedinzones1and2with
groupIIA,IIB,andIICflammablegases,tempera-
tureclassesandvapoursT1,T2,T3andT4.
3. The equipment is certified for use in ambient
temperatures in the range –20°C to +55°C (-4
to +131 F). The equipment should not be used
outsidetheseranges.
4. Compliance with Essential Health and Safety
Requirements has been assured by compliance
withIEC60079-0,IEC60079-1,IEC60079-11,as
certifiedbyBaseefa.
Compliance with gas detection performance
standards EN 60079-29-1, EN 60079-0, EN
60079-1andEN50104andEN 50270hasbeen
certifiedbyLloydsRegister.
5. Repairofthisequipmentandgassensorreplace-
mentshallbecarriedoutbythemanufactureror
in accordance with the applicable code of prac-
tice.
6. If the equipment is likely to come into contact
withaggressivesubstances,thenitistherespon-
sibility of the user to take suitable precautions
thatpreventitfrombeingadverselyaffected,thus
ensuring thatthe typeof protectionis notcom-
promised.
7. Therechargeablebatterymustonlybechargedin
non-hazardous(safe) areasby connection tothe
specifiedCrowconchargerpowersupply.
8. The equipmentis not certifiedfor useinatmos-
pherescontainingmorethan21%oxygen.
Area Classifications:
Zone1: AnareaclassifiedasZone1islikely
tohaveignitableconcentrationsof
flammablegases,vapoursorliquids
presentundernormaloperating
conditions.
Zone2: AnareaclassifiedasZone2isnot
likelytohaveignitableconcentrations
offlammablegases,vapoursorliquids
presentundernormaloperating
conditions.
©CopyrightCrowconDetectionInstrumentsLtd2015.
Allrightsarereserved.Nopartofthedocument
maybephotocopied,reproduced,ortranslatedto
anotherlanguagewithoutthepriorwrittenconsent
ofCrowconDetection
Fromthe1stNovember2010,EN60079-29part
1hasbeenharmonisedundertheATEXdirective
94/9/EC.ThereforetocomplywiththeATEX
directive,portableapparatussensingflammable
gasesshouldhaveafunctionalcheckwithgas
beforeeachdayofuse.Othertestingregimesmay
beemployeddependingonlocalcircumstances
Tetra 3
Personal Multigas Monitor
Contents
Unpacking.................................................1
Quickstartguide........................................2
I.Introduction............................................6
II.Operation..............................................8
III.Batteries.............................................12
IV.Alarmindications................................13
V.FixingAccessories................................14
VI.Flowsampling....................................15
VII.MaintenanceandCalibration.............20
VIII.PCinterfaceandsoftware..........................22
IX.i-modulereplacement.........................23
X.Specification........................................25
XI.Accessoriesandspareparts.................26
XII.Troubleshootingguide.......................28
Appendix:Limitationsofsensors..............29
1
Tetra 3 Unpacking
Tetra 3
Personal Multigas Monitor
ThankyouforpurchasingthenewTetra3PersonalMultigasMonitor.Tetra3
hasredefinedportablegasmonitoringandwillgiveyouyearsofunparalleled
serviceandreliability.
Pleasereadthe instructions carefullybefore use. Keep themanualforfuture
reference.
Unpacking
RemovetheTetra3PersonalMultigasMonitorfromthepackaging.TheTetra
3accessorieswillbelocatedinthebottomofthebox.Checkthecontentsare
complete,youshouldhave:
• Tetra3unit;
• Aconfigurationreportdetailingthesensorsinstalled,alarm
settingsandacalibrationcertificate;
• Optionalaccessoriessuchasaspiratorplate,aspiratorbulb,
commslead,chargerandpowersupply.
Battery check
TheTetra3PersonalMultigasMonitorhasalithium-ionrechargeablebattery.
Tetra3willoperateforaminimumof14hourswhenfullycharged.
Tetra3uses aLi-ionbatterypack andshouldarrive withsufficientcharge so
thattheunitcanbeusedstraightoutthebox.However,ifthisisthefirsttime
youhaveusedtheTetra3unit,youmayneedtochargethebatteriestoattain
thefull14houroperatingtime.Theactualoperatingtimewilldependonthe
typesofsensorsinstalled.
Warning: rechargeable units
Donotattempttouseanyotherchargerwiththisunitexcepttheonesup-
pliedbyCrowcon.Failuretocomplycouldinvalidatesafetycertificationand
mayresultinpermanentdamagetotheunit.
2
Quickstart guide Tetra 3
Quickstart guide
1. Getting started
Review your Tetra 3 unit
Switching on your unit
Tetra3requireslittlesettingup,followthesesimplestepstogetyourunitready
foruse.
1. Ensure the unit is in clean air.
2. Switch on
Press and holdtheoperator
buttonuntiltheredLEDflashes.
Theoperatordisplayscreenwill
lightupandtheunitwillbegina
warmupsequence.
Operator
button
Pocket
clip lever
Side view
Top view
Front plate
4Alarm LEDs
Operator LCD
display screen
4s
3
Tetra 3 Quickstart guide
Tetra 3 warm up sequence
a)
Theunitwilltestthealarm
LEDs,sounder,vibration
alerts,andtheoperator
displayscreen.The
soundermaybesilenced
bypressingthebutton.
b) Theunitwillcontinuethroughawarmupsequenceasshownbelow,
thiswilltakeapproximately45seconds.
c) Auto zero
Ifautozeroisenabled(default),theunitwilldisplaytheautozero
menu.Presstheoperatorbuttonwithasingleclicktoconfirmauto
zero.Iftheoperatorbuttonisnotpressedwithinthe10secondtime
out,Tetra3willproceeddirectlytoRunmodewithoutperformingzero.
LEDs Alarm test
Sounder Alarm test
Vibration test
O2
Tetra3
vs.1.00
AUTO ZERO?
Click to
confirm
in 7 secs
i
CH4 %LEL CO ppm
H2S ppm
O2 %
CROWCON
Tetra3
Gas detection you ca.
TODAYIS
Wed
5-Sep-2005
14:02:49
i
NEXTCAL
5-Jan-2005
i
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 ZERO
Auto zero in
progress
0.0
AUTO ZERO
0.0
CH4
H2S
Co
O2
AUTO ZERO
0.0
CH4
H2S
Co
O2
Run mode
Click to
confirm
in 7 secs
4
In the event of an alarm Tetra 3
Run mode
Yourunitisnowreadytouse.
Belowisatypicalscreendisplayshowingthe
unitinnormalgasmonitoringRunmode.
Familiariseyourselfwiththegasesbeing
monitoredinyourunitandmakesureyou
understandsitehealthandsafetyprocedures
intheeventofalarmconditions.
2. In the event of an alarm
Alarm signals
Intheeventofgasconcentrationsexceedingthealarmthresholdsforanygas
beingmonitored,Tetra3willactivatethealarmsignals.
Alarm signals
The red and blue alarm LEDs
will flash, the sounder will
emit a loud, fast series of
beeps, the internal vibrator
alarmwillactivate.Theopera-
torscreenwilldisplay thegas
in alarm and the alarm level.
Seethefiguretotheleft.
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%LELCO ppm
H2S ppm
%
0.0
0.0
0
16.7
2
O2
5
Tetra 3 Switching off
1. Whenthegaslevelreturnstonormal,presstheoperatorbutton.This
willresetyourTetra3unittonormalRunmode.Ifgaslevelsarestillin
alarm,thebuttonwillhavenoeffect.
3. Switch off unit and storage
Switching off unit
1. Pressandholdthebuttonfor5seconds.Theshutdownmenuappears,
continuetoholdbuttonuntiltheunitcountsdowntoshutoff.
Storing conditions
Inordertooptimisesensorperformanceandlifetime,yourTetra3unitshould
bestoredinasafe,non-hazardousarea,0-30°C,10-90%RH.
4. Additional information
ForbatteryrecharginginformationgotosectionIII.
ForfixingaccessoriesgotosectionV.
ForsamplingsectiongotosectionVI.
ForcalibrationinformationgotosectionVII.
FortroubleshootingguidegotosectionXII.
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. Introduction
ThankyouforpurchasingthenewTetra3PersonalMultigasMonitor.Tetra3
isaportablemultigasdetector,designedtobecarriedorwornbyindividuals
workinginhazardousenvironmentssuchasconfinedspaces.Itissuitablefor
useinZone1and2hazardousareas.Tetra3canmonitoruptofourdifferent
gasesanddisplaythereadingssimultaneouslyonadisplayscreen.Alarmwar-
ningsaregiventhroughacombinationofaloudaudiblealarm,abrightvisual
alarmofblue/redflashingLEDsandaninternalvibrator.Tetra3isfittedwith
modular,plugandplaygassensors.Eachsensorcarriesanintelligentprocessor
whichcontainscalibrationandsensorinformation.
Tetra3isoperatedusingaLithium-ionrechargeablebattery.Achargerisavai-
lablewitharangeofoptions.
AtCrowconwerecognisedtheneedforareliableandrobustpersonalmonito-
ringsystem,whichisbothlightweight,compact,easytouseandcosteffective.
Tetra3hasasingleoperatorbutton,andanintelligentuser-friendlydisplaywith
backlight.Gaslevelsarecontinuouslymonitoredprovidingnormalgasreadings,
peakreadingsandtimeweightedaverages(TWA).Tetra3isadiffusionsampling
instrumentwithanoptiontouseahand-operatedaspirator.Configurationand
data/eventloggingishandledbyCrowconPortablesPCsoftware,thePCcom-
municationlinkbeingprovidedthroughthechargerinterface.
Tetra3’sshapeanddesignmakesitcomfortabletowearandasnon-intrusive
aspossible,withanon-slipgripforbetterhandling.Extraaccessories,suchas
shoulderstrapandchestharness,canbepurchased.
Tetra3hasbeendesignedfromtoptobottomtobringyoueaseofuse,low
maintenanceandextremelyhighreliability.Throughaninnovativeandrigorous
designprocess,wehavecombinedseveralfeaturesfromourreliableTetraand
GasmanproductstoproducethenewTetra3.
i-module gas sensor
Tetra3usesuniqueplugandplayi-modulesensortechnology.Eachsensorunit
incorporates its own intelligent processor holding sensor configuration and
calibrationdata.Differentsensormodulescanbepurchased,andonceinserted,
areimmediatelyreadytorun.Tetra3canoperatewithuptothreesensorsand
displaysimultaneously,informationandgasreadings,forallthesensors,on
onescreen.Thismeansnoredundancyandassuredfutureinvestmentinyour
Tetra3unit,allowingyoutoswapsensorsbetweenunitsorconfigureyourunit,
asappropriate,toyourcurrentneeds.Plugandplaywilleasemaintenancetime
7
Tetra 3 Introduction
andcost,andtheintelligentmodularsystemwillremovetheneedtocalibrate
eachsensor.Additionali-modulescanbepurchased,pre-calibratedfromyour
localsupplier.
Reliable, anti-shock mechanics and robust housing
TheTetra3housingisbuiltfromresilientmaterial,givingitstrengthandflexi-
bilitytowithstandthehardestofworkingconditions,wateranddusttightto
IP65andIP67,andwithanon-slipgrip.Thecasehasbeencarefullydesigned
tomakeservicingeasyandatthesametimeveryrugged.Iftheunitisdropped,
therewillbenodisruptionofpowerorfunction,ensuringreliabilityandservice
foryearstocome.
Software
TheprocessesusedtodesignanddeveloptheTetra3softwareensureahigh
degreeofreliability and robustness.ThusTetra 3 has been designed to be a
trulyreliablepersonalgasmonitoringsystem.Theinternalcircuitryincludesan
external watchdog,where thesoftwaremonitorsforany malfunction within
theunitandwilldisplayanerrorwarningtotheusershouldtheyoccur.
8
Operation Tetra 3
II. Operation
2.1 Switch-on sequence
1. Ensure the unit is in clean air.
2. Switch on
PressandholdtheoperatorbuttonuntilthetworedLEDsflash.
TheinstrumentbeginswithtestingalltheLCDsegmentsonthe
operatordisplayscreen,theredandbluealarmLEDs,sounderand
internalvibratoralertforabout5seconds.Thesoundermaybe
silencedbypressingthebutton.Theunitentersawarmupmodeand
displaysasequenceofscreens,seepage3formoredetails.Attheend
ofwarmup,theautozeromenuwillbedisplayed.
3. Auto zero menu
Presstheoperatorbuttonwithasingleclicktoconfirmautozero.
Iftheoperatorbuttonisnotpressedwithin10seconds,Tetra3will
proceeddirectlytoRunmodewithoutperformingazero.Flammable
andtoxicsensorswillbesettoreadzeroandtheoxygensensorto
read20.9%.
NB. If auto zero fails, a warning message will be displayed and an ‘X’ will
appear against the sensor that has failed.
Switch off
Toswitchofftheunit,pressandholdtheoperatorbuttonfor5
seconds.Ashut-downmenu‘OFFIN’willappear.Continuetohold
buttonuntiltheunitcountsdowntoshutoff.
Battery check
Usethistimetocheck
thereissufficientchargein
thebatterypack
!
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 mode
TheTetra3unitwilldisplayuptofourgasreadingssimultaneouslyontheope-
ratordisplayscreen.Atypicalfourgasdisplayisshownbelow.
Eachchannelwilldisplaythegasname,unitsandcurrent
value.Familiariseyourselfwiththegasescurrentlybeing
monitoredinyourunit.Ensureyouunderstandsitehealth
andsafetyprocedures.ForinformationonpeakandTWA
readings,gotosection2.4.
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 guide
Battery
Afullbatteryisrepresentedbyabatteryiconshowingafullsix
bars.Alowbatterychargewillshow1to2bars.Whenzero
barsareshownthebatteryiconflashes.Thesounderwillemit
warningbleeps.
Ifthebatterybecomestoolow,Tetra3willdisplaya‘Battery
low’warningmessageandswitchoff.
TWA alarm
Tetra 3 will display the TWA alarm when the 15 minute or
8hourtimeweightedaveragealarmthreshold ispassedfor
toxicgases.
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 options
Tetra3providestwoadditionalselectabledisplays:
Peak display
WhenPeakmodeisselectedtheinstrumentshowsthehighestvalue
forflammableandtoxicgasesandthelowestvalueforoxygensince
theunitwasswitchedonorsincethelastpeakclear.
After5secondsthescreenwilldisplay'PeakClear'.Ifyoupressthe
buttonwithinthe10secondcountdown,thepeakvalueiscleared.
Ifthebuttonisnotpressed,thedisplaywillreverttothestoredpeak
value.
WhilstinPeakmode,newhighergasvaluesarestored.Uponexitof
Peakmode,thestoredpeakvaluesarenotdeleted.
Thisisusefulforverticalentrycheckswhereawholeinstrumentcanbe
lowereddowntheshaftratherthanjustasamplingtube.
TWA display
Showsthe8hourtimeweightedaverage(TWA),fortoxicgases,
monitoredsincelastturnon.
1. Toviewtheadditionaldisplayoptionmenu,double-clicktheoperator
button.
2. Presstheoperatorbuttonwithasingleclicktoscrollthroughthelist.
Whenyourchoiceishighlighted,double-clicktheoperatorbutton.
TheTetra3operatorscreenwilldisplaythepeakorTWAiconandthe
gasreadingsrecorded.
10
CH4%LEL CO ppm
H2S ppm
O2 %
0.0
0.0
0
20.8
OK
Gas
Peak
TWA
Zero
0
Gas
Zero
TWA
Peak
1. Scroll
2. Select
ppm
%
0
20.8
OK
Peak display
11
Tetra 3 Event logging
11
Zero
TheTetra3instrumentcanperformanautozerobyselectingtheZero
functionfromthemenu.WhenZeroiscompleted,theinstrumentwill
returntonormaloperation.
2.5 Logging
Tetra3incorporatesdataandeventloggingwhichcanbeaccessedusingthe
communicationslinkwithPortablePCsoftware.SeesectionVIII.
TheTetra3eventlogrecordsthetimeanddateforanumberofoperatingand
diagnosticeventsincluding:
• Switchonandswitchoff;
• Level1,Level2andTimeWeightedAverageAlarms,alarmon,
alarmoffandthepeaklevelduringthealarm;
• Zero,calibrationandgastestwithsuccessorfailure;
• Pellistorsaveronandoff;
• ThebatteryconditionisloggedeverytimetheTetra3is
switchedonoroff,andwhenitisplacedintoorremovedfrom
thecharger;
• Dataloggingrecordsreadingsetsdataatapredeterminedtime
interval,usuallysettooneminute.
12
Batteries Tetra 3
III. Batteries
3.1 Rechargeable batteries
Tetra 3 uses a rechargeable Lithium-ion battery which must onlybecharged
usingaCrowconbatterycharger.A5hourrechargefromflatwillprovideat
least12hoursoperatingtime.Afullychargedbatterywillprovidemorethan
14hoursofcontinuoususe.
Charging the batteries
1. Ensure you are in a safe area.
2. Plugthechargerpowersupplyintoamainssocket.
3. Connectthepowersupplytothe
charger.InserttheTetra3intothe
charger.
Switchonthecharger'spower
supply.
Theunitwouldnormallybeleft
switchedoffforcharging.When
chargingiscompletetheredLED
isextinguished.(Earlyunitshada
greenLEDilluminateoncompletion
ofcharge).Iftheunitisswitched
onduringchargethenormal
displaybatteryiconsweepsfrom
emptytofull.Ondisconnecting
thechargerpowersupplythisdisplayiconwillupdatein20secondsto
showactualchargestate.
InRunmode,thebatteryiconwilldisplaysixbarswhenitisfull.
4. RemovetheTetra3fromthechargerandswitchontouse.
Communications
socket
Battery full
Low battery
Battery needs
recharging
25
i
WARNING
Tetra warning message
Battery fully charged
The charging time will be longer if the unit is switched on during charging.
13
Tetra 3 Alarm indications
IV. Alarm indications
Tetra 3 provides two instantaneous alarm levels for each installed sensor,
designatedlevel1andlevel 2.Fortoxicgassensors,therearealsotwotime
weightedaveragealarms(TWA),oneforshorttermexposure(STEL):basedona
15minutetimeweightedaverage,andthesecondTWAalarmisforlongterm
exposure:basedona8hourtimeweightedaverage.
AlarmconfigurationsaresetviatheCrowconPortablesPCsoftware.
Thefollowingsettingscanbemade:
Alarm thresholds for each sensor: Level1andlevel
2alarmscanbesetforeachindividualgassensor.
Alarm type:This can be set to rising levelsof gas concentration, or as
falling.Oxygenaresettofallingfordeficiencymonitoringasadefault.
Alarm latching:Alarms canbesettobelatchedorunlatched.Latched
alarmswillrequiretheoperatorbuttontobepushedinordertoclearthe
alarm.Thisisthedefaultsetting.Unlatchedalarmswillclearautomatically
whenthegashazardhaspassed.
Alarm mute: The sounder can be set to mute for level 1 alarm only;
pressingthe operator buttonduring an alarm condition i.e.presenceof
hazardousgas,willsilencethesounderandstopthevibrationalarm.The
alarmLEDswillcontinuetoflash.
Alarm sounder tone:Differenttonescanbeselectedtoachievethebest
performanceforthemonitoringconditionsavailable.
In the event of a Time Weighted Alarm (TWA)
Intheeventthe15minuteorthe8hourTWAistriggered,
Tetra3willgointoalarmanddisplaytheTWAiconwiththe
toxic gas readings. Neither the 15 minute alarm or 8 hour
alarmcanbecleared.
1 2
14
Fixing Accessories Tetra 3
V. Fixing Accessories
Belt clip
Tetra3hasastrongalligatorcliplocatedonthebackoftheunit.Liftingthe
smallleverwillallowtheunittobeattachedtoabeltmoreeasily.
Universal harness plate
Crowcon provide a universal harness plate which can be used with either a
chestharnessorashoulderstrap.
How to wear your Tetra 3 unit
Chest harness
UsetheM3fixingontheback
of your Tetra 3 unit to attach
thechestharnessplate.Create
a chest harness by attaching
one strap to the top connec-
tors, to go around the neck,
and the other to link around
the waist using the side con-
nectors. Adjust the lengths
until the Tetra 3 unit is in a
comfortableworkingposition.
Shoulder strap
Withtheuniversalharnessplateinplace,attachtheshoulderstrapaccessory
ontothetopconnectors.Adjusttoacomfortableworkingposition.
Seeaccessories,sectionXI,forfulllist.
Shoulder/neck
connectors
Universal harness plate
15
Tetra 3 Flow sampling
VI. Flow sampling
Attaching the flow adaptor plate
ToperformmanualsamplingusingTetra3,aflowadaptorplatemustbefitted
ontothefrontoftheinstrument.
1. Tofittheflowadaptorplate,cliptheplateinplaceoverthesensor
grillsandscrewthethumbscrewuntiltheplateistightlyfittedinto
place.
2. Attachthesamplingtubeorflowaccessoryontothegasinletnozzle.
3. Attachtheaspiratorbulbontothegasoutletnozzle.
4. Toremovetheflowadaptorplate,unscrewthethumbscrewandlift
theplateawayfromtheinstrument.
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 instruments
Whenusingthemanualaspiratorkit,adoptaconsistentstylewhilstusingthe
handaspirator.Crowconrecommendsqueezingoncepersecondtoachievea
flowrateofapproximately0.5-1litre/min.Atleast10pumpspersampleare
recommended.
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Crowcon Tetra 3 User manual

Tetra 3
Crowcon
Brand
Crowcon
Model
Tetra 3
Category
Carbon monoxide (CO) detectors
Type
User manual

Crowcon Tetra 3 is a portable multigas detector designed to protect individuals working in hazardous environments. It can simultaneously monitor up to four different gases and display readings on its screen. It features audible and visual alarms, including bright flashing LEDs and a loud sounder, as well as an internal vibrator to alert users to dangerous gas concentrations. Tetra 3 is suitable for use in Zone 1 and 2 hazardous areas and can operate for a minimum of 14 hours on a single charge.

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