Extech Instruments Oyster 341350A-P User manual

USERGUIDE
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OysterMeter
pH,Conductivity,TDS,Salinity,andORP(mV)
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Model341350A
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341350A-en-US_V1.3 8/15
2
Introduction
CongratulationsonyourpurchaseoftheExtechOysterSeriesmeter.ThisdevicemeasurespH,
Conductivity,TDS,ORPandSalinity.Thesemetersareintendedforroutinelaboratoryandfield
testing.Accuratemeasurementsareprovidedinabatteryoperated,portablemeterwithahinged
displaythatcanbeadjustedtoanyviewingangle.Thisdeviceisshippedfullytestedandcalibrated
and,withproperuse,willprovideyearsofreliableservice.
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MeterDescription
FrontandSidepanels
1. LCDdisplay
2. Batterycompartment
3. Powerbutton
4. Up/Downarrowbuttons
5. MODE/CALbutton
6. UNIT/SETbutton
7. STORE/RECALLbutton
8. Connector,Conductivityprobe
9. Connector,pHprobe,ORPprobe
10. Connector,Temperatureprobe
11. Connector,ACadaptor
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Display
1. Modeindicators
2. Primarydisplay
3. DataHoldindicator
4. ProbeRenewindicator
5. AutoPowerOffindicator
6. Lowbatteryindicator
7. Memorystatusindicators
8. Calibrationstatusindicators
9. Temperaturedisplay
10. Unitindicators
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891011
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341350A-en-US_V1.3 8/15
3
Operation
BatteryInstallation/Replacement
Openthebatterycoverbyinsertingasmallcoinintothelatchslotandpressingdownward.The
coverwillreleaseinthedirectionofthearrow.Installthenewbatteryandreplacethecover.
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pHMeasurements
1. PressthePOWERbuttontoturnthemeterON(themeterwillcyclethroughaself‐check).
2. PresstheMODE/CALbuttonuntilthePHiconswitcheson.
3. PresstheUNIT/SETbuttontoselectºCorºF.
4. ConnectthepHelectrodetothesidepHBNCconnector.
5. Adjustthe▲▼buttonstomatchthetemperatureofthesolution(orusetheexternal
temperatureprobetodoso).
6. Ifrequired,calibratetheelectrode(seepHCalibration).
7. PlacetheelectrodeinthesamplesolutionandreadthepHvalueonthedisplay.
8. Whenallmeasurementshavebeentaken,unplugtheelectrodeandrinseindistilledwater;
thenshakeandstoreitinthewettingcapwith4.0MKCLorinapH4buffersolution.
Conductivity/TDS/SaltMeasurements
1. PressthePOWERbuttontoturnthemeterON.
2. PresstheMODE/CALbuttonuntiltheCOND,SALTorTDSiconisdisplayed.
3. Connecttheconductivityelectrodetothesideconductivityconnector.
4. Ifrequired,calibratetheelectrode(seeConductivityCalibration).
5. Placetheelectrodeinthesamplesolutionandreadthevalueonthedisplay.
6. Whenfinished,unplugtheelectrodeandrinseindistilledwater.
ORP(mV)Measurements
1. PressthePOWERbuttontoturnthemeterON.
2. PresstheMODE/CALbuttonuntiltheORPiconisdisplayed.
3. ConnecttheORPelectrodetothesideORPBNCconnector.
4. PlacetheelectrodeinthesamplesolutionandreadthemVvalueonthedisplay.
5. Whenallmeasurementshavebeentaken,unplugtheelectrodeandrinseindistilledwater.
6. Storetheprobetipinthewettingcapina4.0MKCLorinapH4buffersolution.
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341350A-en-US_V1.3 8/15
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DataMemory
25readingscanbestoredto,andrecalledfrom,theinternalmemory.
Storingreadings
1. Withthereadingonthedisplay,momentarilypresstheSTORE/RECALLbutton.TheSTORE
andHOLDdisplayiconswillappearontheLCDandthereadingwillfreeze.
2. MomentarilypresstheSTORE/RECALLbuttonagaintoconfirmandtoreturntothenormal
operationmode.
3. Upto25readingscanbestoredinthisway.
RecallingReadings
1. PressandholdtheSTORE/RECALLbutton.TheRECALLiconandthememorylocation
numberwillappear,followedbythedatastoredinthedisplayedmemorylocation.
2. Usethe▼▲buttonstoscrollthroughthememorylocationsandtoviewthestoreddata.
3. MomentarilypresstheSTORE/RECALLbuttontoexittheRecallReadingsmode.Endwill
appearinthedisplay;themeterwillthenreturntothenormalmeasurementmode.
Clearingthememory
Withthemeteron,pressandholdthe▼and▲buttonsfor2seconds.TheCLriconwillappear
onthedisplay,indicatingthatthememoryhasbeenerased.
TemperatureUnits
PresstheUNITbuttontoselectºForºC.
ManualTemperatureCompensation
InthepHmode,thesolutiontemperaturecanbemeasuredandsetbyusingtheoptional
externaltemperatureprobeor,whentheprobeisnotused,byadjustingthetemperature
display.Pressthe▲▼buttonstosetthetemperaturewhentheMTCiconisdisplayed.
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TheConductivityprobehasabuilt‐intemperaturesensorsomanualtemperaturecompensation
doesnotapplyforConductivitymeasurements.
AutoPoweroff(APO)
ThemeterisequippedwithanAutomaticPowerOfffeature.Themeterwillpowerdownaftera
10‐minuteperiodofinactivity.ThisfeaturecanbedisabledbypressingandholdingthePOWER
buttonfor2seconds(theAPOdisplayiconindicatesthatthisfeatureisenabled).Afterdisabling
APO,thenexttimethemeterispoweredupAPOwillbere‐enabled.
ResettoDefaultsettings
Themetercanberesettoitsfactorydefaultconfiguration:
1. WiththemeterOFF,pressandholdthePOWERandSTORE/RECALLbuttonssimultaneously
untildFLtrStappearsinthedisplay.
2. Releasethebuttonsandthemeterwillcontinuewithanormalstartup.
3. Defaultvaluesinclude:Calibrationvalues,Conductivitymode,ºC,MTC,APOandRENEWoff
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341350A-en-US_V1.3 8/15
5
pHCalibration(1,2,or3points)
Atwopointcalibrationwithabufferof7plus4or10(whicheverisnearesttotheexpected
samplevalue)isalwaysrecommended.Aonepointcalibration(choosethevalueclosesttothe
expectedsamplevalue)orathreepointcalibrationisalsovalid.Forbestaccuracy,always
calibrateatthesampletemperature.Frequencyofcalibrationisdependentonhowoftenthe
meterisused,thecareoftheelectrode,andstrengthofthesamplestested.Typically,itis
recommendedthatcalibrationbeperformedonceaday;orbeforeeachuseifthemeterisnot
usedonadailybasis.
1. ConnectthepHprobeandplaceitintoapH7buffer.
2. PressthePOWERbuttontoturnthemeteronandpresstheMODE/CALbuttonuntilthePH
iconappears.(Note:disabletheAutoPowerOfffeaturetoavoidanautomaticpoweroff
duringcalibration).
3. IftheMTCiconappearsnexttothetemperaturedisplay,pressthe▼or▲buttontoset
thetemperatureofthepHbuffer.Iftheoptionaltemperatureprobeisused,insertthe
probeintothebuffersolution.
4. PressandHOLDtheMODE/CALbuttonuntilthedisplaybeginstoflash‘7.00’.Themeter
automaticallyrecognizesthebufferandcalibratesitselftothatvalue.Attheendofthe
calibrationcycle,SAandEndwillbrieflyappearonthedisplayandthemeterwillreturnto
thenormaloperatingmode.
5. Whenacalibrationisperformed,thecalibrationicons(pH10)(pH7)(pH4)willbe
cleared(calibrationdataisnoterased)andwillbereplacedwhenasuccessfulcalibrationis
performedforeachbufferwithinonepoweroncycle.Theseiconsindicatewhatcalibration
levelswerelastperformed.Theydonotindicatehowrecentlythecalibrationwas
performedorifthecalibrationsarestillvalid.
6. RemovetheelectrodefromthepH7buffer,rinseinarinsesolutionandinsertitintothe
pH4orpH10buffersolution.
7. Repeatstep4forthesecondcalibrationpointandthenthethirdpointifdesired.
Note:Iftheoutputoftheelectrodefallsoutsidepredeterminedlimits,themeterwillcancelthe
calibration,indicateEnd,andflashtheRENEWicon.Thistypicallyhappenswhentheelectrode
hasagedandneedsreplacement.
Note:Toavoidcrosscontamination,alwaysrinsetheelectrodeinarinsesolution,likedistilled
water,whenchangingfromonebufferorsampletothenextbufferorsample.
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ORPCalibration
TheORPelectrodedoesnotrequirecalibration.
However,youcantesttheORPprobe’saccuracyusinganORPstandard.
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341350A-en-US_V1.3 8/15
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Conductivity(TDS&Salt)Calibration
Conductivityaccuracyverificationshouldbeperformedonaperiodicbasis;oncepermonthis
therecommendedcyclefornormaluse.Ifcalibrationisrequired,aconductivitystandard
solutionmustbeobtained.Themetercanbecalibratedinanyorallofthethreeranges.
Standardizingsolutionsof84µS/cm,1413µS/cmor12.88mS/cm(12,880µS/cm)areusedforthe
automaticcalibrationrecognitionprocedure.Noothercalibrationvaluesarepermitted.
Calibrationisalwaysdoneinconductivitymode.SincesalinityandTDSvaluesarecalculated
fromconductivityvalues,thisprocedurealsocalibratestheSalinityandTDSranges.
1. Fillasamplecupwiththestandardizingsolution.
2. TurnthemeterONandinserttheelectrodeintothesolution.Tapormovetheelectrodein
thesampletodislodgeanyairbubbles.
3. PressandholdtheMODE/CALbutton(approximately2seconds)untilthemaindisplay
startsflashing.
4. Themeterwillautomaticallyrecognizeandcalibratetothestandardizingsolution.Atthe
endofthecalibration,thedisplaywillbrieflyindicate“SA”,“End”andthenreturntothe
measurementmode.
Note:The“SA”willnotappearifthecalibrationfails.
5. The“rangecalibrated”alertwillappearinthedisplayforeachrangethatiscalibrated
duringthatpoweroncycle.
Lowrange,84µS/cm
Mediumrange,1413µS/cm
Highrange,12.88mS/cm(12,880µS/cm)
Note:Themeterallowsfora1,2or3pointcalibration.Ifcalibrationisdoneformorethanone
point,thelowestvaluestandardshouldbedonefirsttoobtainthebestaccuracy.
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Temperature(pHandConductivity)OffsetCalibration
Thisprocedureallowsforerrorcorrectionoftheexternaltemperatureprobe(pH)orthe
conductivityprobe’sbuilt‐intemperaturesensor.
1. SwitchtopHorConductivity(Salt/TDS)mode.
2. Placethetemperatureprobeorconductivitycellinthesampleandallowthetemperature
readingtostabilize.
3. PressandholdtheUNIT/SETbuttonuntiltheºCorºFiconbeginsflashing.
4. Adjustthe▼or▲buttonstosetthedisplaytoindicatetheknowntemperatureofthe
sample.
5. MomentarilypresstheUNIT/SETbuttontosavethechangeandreturntothemeasurement
mode.
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341350A-en-US_V1.3 8/15
7
pHTroubleshootingChart
SymptomCauseRecommendedSolution
Longresponse
timeorreading
drift
CloggedJunctionSoakin4.07MKCL@60oCfor30
minutes
Oil,paint,dyes,suspendedsolidson
sensor
Rinseelectrodealternatelywith
materialssolventthenbuffer7.00
DryBulbLongtermstoragewithoutwetting Soakelectrodetipinwettingcapfilled
with1ml7.00bufferfor24to48hours
StaticChargeWipingelectrodesRinseelectrodein7.0bufferandblot.
Donowipeelectrode.
Samereadingsin
differentbuffers
andsamples
CrackedorbrokenbulbReplaceelectrode.Usebulbguard.
Avoidplungingelectrodetobottomof
containerandspinningbars.Awetting
capwillprotectbulbbetween
measurements.
ErraticLCD
display
Sampleshavelowionicstrength
(lackssalt);e.g.distilled,de‐ionized,
boiled,lakewater(highpressure)
Foreach50mlofsampleadd1drop
(50uL)ofSAT.KCLNoalterationinpH
willoccurbyinertKCL.

NotesonpHmeasurementsandelectrodes
1. TheElectrodeshouldbestoredinitswettingcapuntilused.UseapH4buffersolutionora
4.0MKCLsolution.
2. Ifbubblesareseeninthebulbarea,holdtheelectrodebyitscapandshakedownwards
untilbubblesareremoved.
3. Toimprovespeedofresponse,vigorouslystirtheelectrodeinthesample,buffer,orrinse
solution.
4. Afterexposuretoasample,buffer,orrinsesolution,shaketheelectrodewithasnap
motiontoremoveresidualdropsofsolution.
5. Whenpossible,usepartofthenextsample/buffertobemeasuredasarinsesolution,.
6. Keepbuffersandsamplesatthesametemperaturetoavoidtemperatureeffects.
7. pHreadingsstabilizefasterinsomesolutionsthanothers;allowtimetostabilize.
8. Electrodesdeteriorateovertime.Ifaccuracyfallsto10%theelectrodeshouldbecleaned.If
noimprovementisobserved,replacetheelectrode.
NotesontheConductivity/TDS/SaltCell
1. CellStorage:Onsheathedcells,replacethesheathoverthecellwhenstoring.Fornon‐
sheathedversions,soakthecelltipinde‐ionizedwaterforstorage.
2. CellCleaning:Aftereachuse,thecelltipshouldberinsedwithde‐ionizedwater.Ifsolids
buildupinsidethecellcarefullyremovewithacottonswabsoakedinsolventtakingcare
nottotouchthemetalpartsoftheinnercell.
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341350A-en-US_V1.3 8/15
8
SPECIFICATIONS
RangesResolutionAccuracy
pH0.00to14.00pH0.01pH±0.02pH
Conductivity0.0to200.0µS
200to2000µS
2.00to20.00mS
0.1µS
1µS
0.01mS
±2%FS
TDS0.0to134.0ppm
134to1340ppm
1.34to13.40ppt
0.1ppm
1ppm
0.01ppt
(calculatedfromConductivity)
Salinity0.0to100.0ppm
100to1000ppm
1.00to10.00ppt
0.1ppm
1ppm
0.01ppt
(calculatedfromConductivity)
ORP‐1500to1500mV1mV±3mV
Temperature32to194ºF
0.0to90.0ºC
0.1º≤99.9º
1º≥100º±2ºF/1ºC(meter+probe)

Display9999countLCD
MTCtemperaturerange32.0to194.0ºF(0.0to90.0ºC)
pHcalibrationpoints4.00,7.00and10.00pH
Conductivitycalibrationpoints84.0µS,1413µS,and12.88mS
TDSconversionratio0.67(fixed)
Salinityconversionratio0.5(fixed)
AutoPowerOFFAfter10minutesofinactivity(canbedisabled)
Overrangeindication “OL”
OperatingTemperature41ºFto104ºF(5ºCto40ºC)
StorageTemperature‐4ºFto140ºF(‐20ºCto60ºC)
OperatingHumidityMax80%upto87ºF(31ºC)decreasinglinearlyto50%at
104ºF(40ºC)
StorageHumidity<80%
OperatingAltitude7000’(2000m)maximum
Power9ValkalinebatteryorACadapter
Dimensions4.7x3.8x1.8”(118x96x45mm)withmeterclosed
Weight12oz.(340g)
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