electrodos comerciales

Electrode Handbook pH ORP ISE

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Corporate Profile

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| Over 15 Years of Product Excellence |EutechInstrumentsisaleadingISO9001-certified company established in 1990. Dedicated to thedesignandmanufactureofsensor-basedinstrumentsforwaterqualityanalysis, Eutech is a pioneer in the development of ASIC-based(ApplicationSpecificIntegratedCircuit)instruments,andisinternationallyrecognised for its achievements in sensor technology, softwareprogrammingandproductdesign.Eutechhasanextensiveproductline,whichincludestheworldsfirstWindowsCE-drivencolourtouchscreenresearch-gradebenchmeter, aswell as instrumentswithproprietarypatentsandtrademarks.

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| Comprehensive Product Line |Eutechsconstantdriveforinnovationisreasonforouruniqueandexpansiveportfolioofmicroprocessor-basedinstrumentsandchemical sensor systems.Weoffer a comprehensiverange of laboratory and field instruments for electrochemical andphotometricwateranalysis.Eutechalsomanufacturescontinuouson-lineprocessinstrumentsforthemonitoringandcontrolofpH,Conductivity,TotalDissolvedSolids (TDS),RedoxPotential (ORP),DissolvedOxygen(DO)andotherwaterqualityparameters.

Eutechproductsrangefromcompactpockettestersandportablemetersto research-gradebenchtopmetersand industrialprocesscontrollers.EachproductcarriesthesignatureEutechintuitivedesignandispackedwithadvanceduser-friendlyfeatures.

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GlobalOffices

C o n t e n t s1.0 IntroductiontopHMeasurement >>041.1 BasicTheoryandApplicationofpHMeasurement1.2 UseofElectrodesforpHMeasurement1.3 Slope1.4 InfluenceofTemperatureonpHMeasurement

2.0 pHElectrodes >>052.1 SelectionCriteria2.2 Electrodes-SelectionGuide

3.0 pHElectrodesforPreciseMeasurement >>103.1 OpenPorepHElectrodes3.2 SpecialtypHElectrodes

4.0 pHElectrodesforRoutineMeasurement >>154.1 GeneralPurposepHElectrodes4.2 SpecialtypHElectrodes4.3 OtherSpecialtypHElectrodes

5.0 OtherElectrodes >>205.1 ORPElectrodes5.2 IonSelectiveElectrodes(ISE)5.3 ISEGeneralApplicationGuide

6.0 Accessories >>24

7.0 MaintenanceandTechnicalTips >>257.1 MeasurementSystemandCalibration7.2 TestingofpHMeterandElectrode7.3 UseandCareofElectrodes7.4 RejuvenationandReconditioningofElectrodes

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1.1 BasicTheoryandApplicationofpHMeasurementpHreferstothepowerorexponentofhydrogenwherepstandsforpowerandHisthesymboloftheelementHydrogen.

pH is defined as the negative logarithm of the molar concentration of the active hydrogen ions, pH = -log H+ .

pHprovidesaconvenientwaytocomparetherelativeacidityoralkalinityofasampleatagiventemperature.Forexample,purewaterhasaneutralpHof7,wheretheactivitiesofhydrogenandhydroxideionsareequal.Iftheactivityofhydrogenionisgreaterthanthatofhydroxideionthesampleisdescribedasacidic.Ingeneral,asthelevelofhydrogenionactivityincreases,thepHdecreases.ApHbelow7isknownasacidic.Onthecontrary,asthelevelofhydrogenionactivitydecreases,thepHincreases.ApHabove7isknownasalkalineorbasic.

1.2 UseofElectrodesforpHMeasurementpHmeasurementisusuallydonewiththeuseofacombinationelectrode.Thecombinationelectrodeisanelectrodesystemformedbyaglasssensinghalf-cellandaninternalreferencehalf-cell.Asthereferencejunctionactsasthemediumofconductorbetweenthereferenceelectrolyteandthesampletobemeasured,itmustallowfreemovementofelectronsthroughthejunctionandintothesample.ApotentialdevelopsonthemembranesurfacewhenapHelectrodecomesintocontactwithasampleanditsvaluevarieswiththepHofthesample.ThisvariationinpotentialismeasuredinmVbyameterandisconvertedtodirectpHvalues.

1.3 SlopeTheslopeisthevoltageproducedperpH.Intheory,thevalueis59.16mVperpHat25C.Practically,thevaluerangesbetween50and58mV.

1.4 InfluenceofTemperatureonpHMeasurement

TemperaturevariationscanaffectpH.HoweveratacertainpH,usually7,temperaturewillnothaveaneffectonthepotentialofthesystem.Thisisknownastheisopotentialpoint.

Ifautomaticcompensationisnotpractical,thefollowingequationcanbeusedtodetermineerror:Magnitudeoferror=0.003pH/C/pHunitfrompH7

Note:Thetemperaturecompensationherereferstoelectroderelatedtemperaturevariationandnotsolutionrelatedvariations.

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1.0

Introduction to pH Measurement

2.1 SelectionCriteriaEutechcombinationelectrodesoffertheconvenienceofhavingthereferenceandmeasuringelectrodescombinedinasinglehousing.Theyareofferedinavarietyofconfigurationstosuitmostlaboratoryandfieldapplicationneeds.

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2.0

pH Electrodes

Electrode Construction

Single Vs Double Junction

Internal Reference Types|CalomelReference(Hg/Hg2Cl2)|Calomelreferenceelectrodescangivepotentialsaccuratetowithin0.01millivolt.TherepeatabilityandpotentialstabilityofsuchelectrodesaresuperiortothoseoftheAg/AgClelectrode,althoughonlyataconstantandrelativelylowtemperature.Calomelissubjecttoaconstantandrelativelylowtemperaturefluctuationwithatemperaturelimitationof80C.Calomelisrecommendedforclinicalmeasurement;forsamplescontainingprotein,trisbuffers;andforhighpuritywaterapplications.

|Silver/SilverChlorideReference(Ag/AgCl)|Ag/AgCl referenceelectrodesare largelyhysteresis-freeandcanbeusedatahigher temperaturewith lowertemperaturecoefficients.Ag/AgClisthebestgeneralpurposereferencewithawidetemperaturerange(-5to110C).

|DoubleJunction|AdoublejunctionreferenceisconstructedwithanAg/AgClinnerchamberandachemicallycompatiblereferencesolutionintheouterchamber.Itisrecommendedforsamplescontainingorganiccompounds,proteins,heavymetals;andothercompoundsthatinteractwithsilver,suchasbromides,iodides,cyanidesandsulfides.

Glass Body

Glasswithstandshightemperatureof100Cormore.

Resistanttocorrosivematerialsandsolvents.

Brittle.

Idealforlaboratoryuseandiseasytoclean.

Plastic Body

Notrecommendedforusageattemperatureabove80C.

Moderateresistancetohighlycorrosivematerialsandsolvents.

Durableandwithstandsroughhandling.

Idealforfielduse.

Single Junction

Idealforgeneralpurposeapplications.

Ag+ionsareincontactwithjunctionandthiscancausechemicalinteractionwithsulphur.Notsuitableforbiologicalsamplesortrisbuffers.

Double Junction

Preventsinterferencebetweentheinnerfillsolutionandsample.

ElectrolyteisfreeofAg+ions.Suitableforusewithbiologicalsamples.Canbeusedinplaceofcalomelreferenceelectrodes.

Refillable Vs Sealed Design

Reference Construction|RefillableReferenceCell|Selectedforhighaccuracy,stability,andlongerelectrodelife.Refillabletypessacrificeconvenienceandeaseofmaintenance.

PatentedTwist-CapDesignUnlikeconventionaldesignswhichuserubbersleeves,Eutechs620seriesrefillableelectrodesfeatureapatentedrefill-holewithtwist-capdesigneasy-to-useandleak-proof.Refillingofreferenceelectrolyteishassle-freeandquickwithnowastage.

|SealedReferenceCell|Sealedgel-filedreferenceelectrodesaredesignedforconveniencewhereminimalmaintenance is required.Slightly loweraccuracyandshorterlifemustbetakenintoaccount.

Twist-openthecaptoexposetherefillinghole.

Pourinreferenceelectrolytewiththerefillingbottle(thatissuppliedwithallelectrodes)

Twist-closethecap.

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Refillable Design

Refillholeallowsreferenceelectrolytereplenishment.

Canbeusedmanytimesover.

Needsrefillingwhenfillsolutionislow.

Sealed Design

Norefillhole.Thereferenceelectrolyteisusuallyagel.

Replacementoftheelectrodeisnecessarywhenitgetscontaminated.

Virtuallynomaintenanceisrequired.

Types of Reference Junctions

Reference JunctionsSomeglasscombinationelectrodesfeatureananti-foulingannularceramicjunction.Theannularjunctionisformulatedwithaspecialceramicwhichencirclestheglassbulb.NumerousporesintheceramicprovidelowerresistanceandmorestablepHreadings.TheplasticbodycombinationelectrodescomestandardwithaporousHDPEpinjunction.Sleevejunctionprovidesthehighestflowratefordifficultsamples.

General Purpose Vs Specialty ApplicationsMostelectrodescomeindifferentstemlengthsanddiametersforspecificapplications.

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Open pore Junction

About200timeslargerthanceramicjunctions,ensuresincreasedelectrolyteflowforstablejunctionpotential.

Annular Junction

Fastelectroderesponse.

Porous HDPE Junction

Lowelectrolyteflow,hencemoredurable.

Flushable Junction

Cleansesbypumpingoutelectrolytetoremoveresidue,thuseliminatescloggingproblemsinviscoussamples.

General Purpose Applications

Usuallymeasures120mm(length)by12mm(diameter)andcanbeusedforgeneralapplications.

Specialty Applications

Effectiveforspecificapplications.ForinstancethespeartipsensorcanbeusedforthedirectpHtestingofsemi-solidsandsoftmaterials.Sleevetypeelectrodeensureshighelectrolyteflowsoitisidealforlowionicstrengthandviscoussamplemeasurements.Ontheotherhand,aflatsurfacetipelectrodeisusedforflatsampleslikepaperorcloth.Micro-stemelectrodefitsintothinstemNMRtubesorsmallvessels.Forharshuse,adurabletoughbulbelectrodethatisresistanttobreakageisrecommended.

2.2 Electrodes-SelectionGuideGlass Body Combination pH Electrodes

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Code No.

Glass Type

Application Code

pH Range

TemperatureRange (C)

Length x Dia. (mm)

Internal Reference Element

ECFG73504 X-2 A,F 0-13 0to100 110x12 Ag/AgClRefillable

ECFG73905 X-2 B,C,G 0-13 -5to80 110x12 CalomelRefillable

ECFG73792 X-2 H,O 0-13 0to110 110x12Ag/AgClDoubleJunctionSealed

ECFG73593 X-2 H 0-13 0to100 110x12 Ag/AgClSealed

ECFG73701 X-2 E,O 0-13 0to100 110x12Ag/AgClDouble JunctionRefillable

ECFG74519 X-3 H,T 0-14 5to110 110x12 Ag/AgClSealed

ECFG63506 X-2 A,D 0-13 0to100 55x8 Ag/AgClRefillable

ECFG43902 X-2 B,C,M 0-13 -5to80 180x4 CalomelRefillable

ECFG43904 X-2 B,C,M 0-13 -5to80 55x4 CalomelRefillable

ECFG73521 X-2 Q 0-13 0to100 110x12 Ag/AgClRefillable

ECFG63511 X-2 J 0-13 0to100 25x8 Ag/AgClSealed

ECFG53912 X-2 B,J 0-13 -5to80 25x6 CalomelRefillable

ECFG52910 X-1 B,S 0-12 -5to80 55x6 CalomelRefillable

ECFG72520 X-1 I 0-12 0to100 110x12 Ag/AgClRefillable

ECFG73711 X-2 D,O 0-13 0to100 110x12Ag/AgClDouble JunctionRefillable

ECFG73511 X-2 D 0-13 0to100 110x12 Ag/AgClRefillable

ECFG72710LI X-2 E 0-13 0to100 110x12LiClDouble JunctionRefillable

EC620130 X-2A,B,C,G,L,O,Q,R

0-14 0to80 160x12Ag/AgClDouble JunctionRefillable

EC620131 X-2A,B,C,D,L,O,Q,R

0-14 0to80 130x12Ag/AgClDoubleJunctionSealed

EC620133 X-2 A,B,I,O,Q 2-14 0to50 25x6Ag/AgClDouble JunctionSealed

EC620185 X-2 A,B,K,L,O 0-14 -5to100 102x10Ag/AgClDouble JunctionRefillable

EC620181 X-2 A,K 0-14 0to80 102x10 Ag/AgClRefillable

EC620183 X-2 A,B,K 0-14 0to80 102x10Ag/AgClDouble JunctionRefillable

EC620286 X-2 A,B,G 0-14 -5to80 106x10 CalomelRefillable

EC620293 X-2 B,N,P 0-14 -5to80 150x6 CalomelRefillable

EC620095 X-2 B,N,P 0-14 0to80 254x3 CalomelRefillable

EC620096 X-2 B,N,P 0-14 0to80 127x3 CalomelRefillable

EC620297 X-2 B,N,P 0-14 -5to100 165x5 Ag/AgClRefillable

Membrane Glass Types X-1 isespeciallysuitedfor lowtemperature,nonaqueoussolutionsand pHmeasurementsunderpH12.

X-2 isbestsuitedformostpHmeasurementswhereminimalornoNa+is present.Itisalow-resistantglasswithaveryfastandstableresponse and isdesignedforpHrangesof0to13andtemperaturesof0C to135C.

X-3 is especially formulated for continuous, long-term use at high temperatures,particularlyinstrongalkalinesolutionsabovepH11.It experiencesnegligibleNa+ionerrorabove13pH.Theimpedanceofthe glassismuchhigherthanotherglasses,andaslowerresponsewillbe experiencedatroomtemperatureandbelow.Responsetimeincreases asthetemperatureiselevated.

* All electrodes are supplied with standard cable length of 1m and with BNC connectors. Refer to our price list for electrodes with longer cable length.

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Plastic Body Combination pH Electrodes

Code No.

Glass Type

Application Code

pH Range


Length x Dia. (mm)


ECFE74526 X-3 T 0-14 -5to80 115x12 Ag/AgClSealed

ECFE72511 X-1 I 0-12 0to100 115x12 Ag/AgClSealed

ECFE53901 X-2 B,N,P 0-13 -5to80 155x6 CalomelSealed

ECFC72521 X-1 A,L,R 1-13 0to80 110x12 Ag/AgClSealed

ECFC72521R X-1 A,L,R 1-13 0to80 110x12 Ag/AgClRefillable

ECFC72522 X-1 A,L,O,R 1-13 0to80 110x12Ag/AgClDoubleJunctionSealed

ECFC72522R X-1 A,L,O,R 1-13 0to80 110x12AgAgClDoubleJunctionRefillable

EC620132 X-2 A,B,G,L,O,Q 0-14 0to60 120x12Ag/AgClDoubleJunctionSealed

EC620109 X-2 B,D,G,L,Q 0-14 0to100 175x12Ag/AgClDoubleJunctionRefillable

EC620116 X-2 A,B,D,G,L,Q 0-14 0to100 175x12Ag/AgClDoubleJunctionRefillable

EC620300 X-2 A,B,L 0-14 -5to80 106x10 CalomelRefillable

Plastic Body Combination ORP Electrodes

Code No.

Sensor Type

Application Code


Length x Dia. (mm)


ECFC79602 PlatinumBand U,V 0to80 110x12 Ag/AgClSealed

ECFE77689 Antimony Y 0to80 110x12 Ag/AgClSealed

ECFE78602 GoldDisc W 0to80 110x12 Ag/AgClSealed

ECFC79601 PlatinumPin U 0to80 110x12 Ag/AgClSealed

ECFC79601R PlatinumPin U 0to80 110x12 Ag/AgClRefillable

ECFC79602 PlatinumPin U,X 0to80 110x12Ag/AgClDoubleJunctionSealed

ECFE79602R PlatinumPin U,X 0to80 110x12Ag/AgClDoubleJunctionRefillable

A Generalpurpose,aqueouspHmeasurements.Qualitycontrol, generallaboratoryandaquariumwater.B Trisbuffers,clinical,andbiologicalmediacontainingproteins, creams,fatsandcosmetics.C Researchmeasurements,fruitjuices,beer,milkandyogurt.D Highviscositysolutionssuchasemulsions,suspensions, paintsandvarnisheswherefrequentcleaningofthereference isnecessary.E Nonaqueoussolutions.Mustbeusedwithspecialreference electrolyteECRE015.F Lowtemperaturemeasurements.G Lowionicstrengthsolutions,suchashighpuritywater.H Hightemperaturemeasurements.I Surfacemeasurementssuchaspaper,skin,textile,leatherand agarplates.J Solidorsemi-solidsamplessuchascheese,meats,fruits,bread, orothersimilarsample.K Ruggeduse;ruggedizedelectrodetip.Aqueousmedia ingeneral.

L PortablepHmeter;fieldandschooluse.M Microsample,suchassemi-microcuvettesandNMRtube.N Testtubemeasurements.O Referencecontaminationproblemswhichrequireadouble junctionreference,suchasmediacontainingsulfides, bromides,iodides,andcyanides.P Measurementsinlong,narrowvessels.Q SoilpHmeasurements.R Swimmingpool,pHcontrolundercontinuousflowconditions.S Isoelectricfocusinggelsandothersurfacemeasurementsthat requireasmalldiameterflattip.T Photographicchemical;highpHsample(12to14pH).U ORPmeasurementsforgeneralpurpose.V SwimmingpoolORPmeasurement.W ORPmeasurementforcyanideuse.X ORPmeasurementrequiringadoublejunctionreference.Y Hydrofluoricacidandabrasivesolutionmeasurements.Z Potentiometricmeasurementsofchloridesandotherhalides.

Application Codes & Descriptions

Unique Fluid-Gel Electrolyte and Open-Pore Junction DesignProvidesafasterflowrateandimprovedcontactforquick,stableandhighlyaccuratereadings.

Refillable Double Liquid JunctionSuitableforhighionconcentrationsamples;alsoperformswellinlowionconcentrationandpartlyaqueoussamples.

3.1 OpenPorepHElectrodesCateringtothediscerninglaboratoryprofessional,thisseriesofopen-poreelectrodesmakesuseofsingleporecapillaryreferencejunctions,whichareabout200timeslargerthantypicalceramicjunctions.Asaresult,theelectrodesarealmostimpossibletoclog,evenindifficultsamples.Ifusedincombinationwithspeciallyformulatedelectrolyte,theflowrateintotheporeisfasterandleadstobettercontactbetweenthereferenceelectrodeandsample.This,inturn,generatesashorterresponsetimeandmoreaccuratemeasurements.

Solid Polymer-Gel ElectrolyteBesides being pressure resistant andmaintenance-free, thepolymergelprovidesamorestablematrixascomparedtoothergelled electrode reference systems.This enhances the abilityof theelectrode toproduce reliable results indirty, ion-weakorproteinsamples;lowpHsamples;andinthepresenceoforganicsolvents.Theruggedspeartipelectrodeisonethatusespolymergelelectrolytetoprovidereliableperformanceneededfordifficultsamplesandisidealforsoftfoods.

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3.0

pH Electrodes for Precise Measurement

EC62

0130

EC62

0132

EC62

0131

EC62

0133

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Model EC620131MeasuringpHRange 0to14pH

TemperatureRange 0to80C

ShaftMaterial Glass

LiquidJunctionType OpenPore

ReferenceJunction DoubleJunction

ReferenceType PolymerSealed

ShapeofMembrane Cylindrical

ShaftLength 130mm

Diameter 12mm



ShaftMaterial Epoxy





ShaftLength 120mm

Diameter 12mm



ShaftMaterial Glass




ShapeofMembrane SpearTip

ShaftLength 25mm

Diameter 6mm



ShaftMaterial Glass



ReferenceType Ag/AgClRefillable


ShaftLength 160mm

Diameter 12mm

0.2mmStandardBulbElectrode 1.0mmStandardBulbElectrode

3.2 SpecialtypHElectrodesRugged Bulb - Five Times Thicker than Regular BulbsThetoughtipelectrodefeaturesaruggedbulbthatis1.0mmthickascomparedto0.2mminastandardbulb.Yettheruggedbulbelectrodeisabletoproducefast,accurateandconsistentmeasurements.

Upto40timesmoredurablethanconventionalglasspHelectrodes,theruggedbulbelectrodedoesnotsacrificeresponsetimes.Itistheperfectanswerinapplicationswherefrequentbreakageofglassbulbelectrodesisaproblem,andwhereplasticbodyelectrodesarenotapracticaloption.Thisruggedtoughtipcombinationelectrodecanweathermuchpunishment-makingitanexcellentchoicefordemandingapplicationsintheplant,fieldandclassroom.Thisdouble-junctionelectrodecomeswithAg/AgClinternalelement,porousceramicouterjunctionandKClelectrolytethatdoesnotinterferewithtrisbuffers.

EC62

0183

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TemperatureRange -5to100C

ShaftMaterial Glass

LiquidJunctionType Ceramic




ShaftLength 102mm

Diameter 10mm



ShaftMaterial Glass

LiquidJunctionType Ceramic




ShaftLength 102mm

Diameter 10mm

EC62

0095

ong Thin StemLongthin-stemelectrodeswithdiameterupto8mmareidealforsmallsampletestinginNMRtubes,centrifuge,testtubesorsmallvessels.

EC62

0293

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ShaftMaterial Glass

LiquidJunctionType Annular

ReferenceJunction SingleJunction

ReferenceType CalomelRefillable


ShaftLength 38.1mm

Diameter 3mm



ShaftMaterial Glass





ShaftLength 150mm

Diameter 6mm

Flushable JunctionTheflushableannularjunctionallowsinstantaneousrefreshingofjunctionbypressingtheelectrodecap.Thisactioncleansclogseffortlessly.Thisversatileelectrodeisidealfortestingdirtywater,lowionicstrengthsolutionsandsolutionswithheavymetalsororganics.

EC62

0109



ShaftMaterial Epoxy

LiquidJunctionType Flushable




ShaftLength 175mm

Diameter 12mm



ShaftMaterial Epoxy

LiquidJunctionType Flushable




ShaftLength 175mm

Diameter 12mm

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ECFC

7252

1

4.1 GeneralPurposepHElectrodesPlastic Body Combination Electrodes Eutechsplasticbodycombinationelectrodesaresuitableforawiderangeofgeneralpurposelaboratoryandfieldapplications.Theelectrodehousingismadeofspecialtyengineeringplasticthathashighimpactresistanceandwithstandstherigoursofruggeduseupto3barpressureandtemperaturesupto80C.

Choosefromtwomodels:single-ordouble-junction,sealed(gel-filled)orrefillable.Standard-sizesealedmodelsarefilledwithpolymerisedreferenceelectrolyte.Theruggedplasticbodyimproveselectrodedurability.TheGlasspHbulbisrecessedforprotection.Userefillableelectrodes(withopenrefillhole)forfast,stableresponse.

ECFC

7252

2

Model ECFC72521 ECFC72521RMeasuringpHRange 1to13pH 1to13pH

TemperatureRange 0to80C 0to80C

ShaftMaterial Plastic Plastic

LiquidJunctionType PorousHDPEPin PorousHDPEPin

ReferenceJunction SingleJunction SingleJunction

ReferenceType Ag/AgClSealed Ag/AgClRefillable

ShapeofMembrane Sphere Sphere

ShaftLength 110mm 110mm

Diameter 12mm 12mm

Model ECFC72522 ECFC72522RMeasuringpHRange 1to13pH 1to13pH



LiquidJunctionType PorousHDPEPin PorousHDPEPin

ReferenceJunction DoubleJunction DoubleJunction




Diameter 12mm 12mm

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4.0

pH Electrodes for Routine Measurement

ECFG

7350

4

ECFC

7352

9

Glass-Body Combination ElectrodesThis laboratory gradeglass body electrodehas arefillableAg/AgCl reference.The annular junctiondelivers fast, stable response and is ideal forgeneral purpose applications in laboratory andfieldenvironments.

Model ECFG73504MeasuringpHRange 0to13pH


ShaftMaterial Glass





ShaftLength 110mm

Diameter 12mm

Note: Plastic body 3-in-1 pH/Temp combination electrode (ECFC7352901B for pH 5/6, Ion 6, pH 11/110, pH 510, Ion 510 and pH 2100/1100)(ECFC7352901W for pH 300/310, PC 300 and PC 510)(ECFC7352901J for pH 600/610/620)

Model ECFC7352901B ECFC7352901W ECFC7352901JMeasuringpHRange 0to13pH 0to13pH 0to13pH

TemperatureRange 0to80C 0to80C 0to80C

ShaftMaterial Plastic Plastic Plastic

LiquidJunctionType PorousHDPEPin PorousHDPEPin PorousHDPEPin

ReferenceJunction SingleJunction SingleJunction SingleJunction

ReferenceType Ag/AgCl Ag/AgCl Ag/AgCl

ConnectorType BNC&2.5mmPhonoBNC&6PinConnector

BNC&8PinConnector

ShapeofMembrane Cylindrical Cylindrical Cylindrical

ShaftLength 110mm 110mm 110mm

Diameter 12mm 12mm 12mm

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ECFG

5390

1

ECFG

4390

4

ECFG

6350

6

Model ECFE53901MeasuringpHRange 0to13pH


ShaftMaterial Epoxy



ReferenceType CalomelSealed


ShaftLength 155mm

Diameter 6mm



ShaftMaterial Glass




ShapeofMembrane Sphere

ShaftLength 55mm

Diameter 8mm



ShaftMaterial Glass





ShaftLength 55mm

Diameter 4mm

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4.2 SpecialtypHElectrodesLong Thin StemLongthin-stemelectrodesbelow8mmdiameterareavailableforsmallsampletestinginNMRtubes,centrifuge,testtubesorsmallvessels.

Organic Sample MeasurementThe calomel reference electrode is ideal forbiotechnologyapplicationswithorganics,proteins,trisbuffersormetals.Itcanwithstandsolutionsthatreactwithsilver.



ShaftMaterial Glass




ShapeofMembrane Sphere

ShaftLength 110mm

Diameter 12mm

Sleeve DesignThe sleevedesignprovideshighelectrolyteflow rate, suitable for improvedresponse time inemulsions, slurries, suspensionsand solutionsof low ionicstrength.Theuniquereferencedesignandfillsolutionminimizedriftandgiveexcellentperformanceathigh temperatures.The sleevecanbe loosenedorremovedforeasycleaning.

Model ECFG73711 ECFG73511MeasuringpHRange 0to13pH 0to13pH

TemperatureRange 0to100C -5to80C

ShaftMaterial Glass Glass

LiquidJunctionType Sleeve Sleeve

ReferenceJunction DoubleJunction SingleJunction

ReferenceType Ag/AgClRefillable CalomelRefillable



Diameter 12mm 12mm

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Spear Tip DesignThe rugged spear tipelectrode is ideal for testingsemi-solids and soft foods. Featuring an annularjunctionforfastresponse,thisrefillableelectrodehasanAg/AgClreference.Thesinglejunctionelectrodeissuitableforlabgels,plantmaterialsandothergeneralpurposeapplications.



ShaftMaterial Glass




ShapeofMembrane Spear

ShaftLength 25mm

Diameter 6mm

ECFG

7390

5

ECFG

5391

2

ECFG

7351

1

page|19

4.3 OtherSpecialtypHElectrodes

Model DescriptionMeasuring pH Range

Temperature Range (C)

Shaft Length

Shaft Diameter (mm)

EC620052GlassBody,Prefilled,CalomelReferenceHalfCellElectrodes(RequireSeparateIndicatingHalf-Cell)

0-14 -5to80 105 10

EC620095MicroProbeGlassBodyCombination,Micro-Tip,152.4mmStemLength,Ag/AgClReference

0-14 0to80 254 3

EC620181ToughRuggedBulbGlassBodyCombinationwithSingleJunction,Ag/AgClReference

0-14 0to100 102 10

EC620284GlassBody,UniversalGlasspHIndicatingHalfCell(RequiresSeparateReferenceHalfCell)

0-14 -5to110 102 10

EC620286GlassBodyCombination,SingleJunction,CalomelReference

0-14 -5to80 106 10

EC620297 MicroProbeGlassBodyCombination 0-14 -5to100 165 5

EC620300PlasticBodyLiquid-FilledCombination,CalomelReference

0-14 -5to80 106 10

ECFC7352901BPlasticBody3-in1pH/Temp(30Kohm)CombinationwithAg/AgClReference,Sealed

0-13 0to80 110 12

ECFE539010BEpoxyBodyCombinationwithCalomelReference,Sealed

0-13 -5to80 155 6

ECFE7251101BEpoxyBodyCombinationwithAg/AgClReference,Sealed

0-12 0to80 115 12

ECFE7352801BEpoxyBody3-in1pH/Temp(1Kohm)CombinationwithAg/AgClReference,Sealed

0-13 0to80 110 12

ECFE7452601BEpoxyBodyCombinationwithAg/AgClReference,Sealed

0-14 5to80 115 12

ECFE7768901BEpoxyBodyCombinationAntimonywithAg/AgClReference,Sealed

2-11 0to100 110 12

ECFG4390201BGlassBodyCombinationwithCalomelReference,Refillable

0-13 -5to80 180 4

ECFG72710LI01BGlassBodyCombinationwithDoubleJunction,Refillable

0-13 0to100 110 12

ECFG7352101BGlassBodyCombinationwithAg/AgClReference,Refillable

0-13 0to100 110 12

ECFG7359301BGlassBodyCombinationwithAg/AgClReference,Sealed

0-13 0to110 110 12

ECFG7370101BGlassBodyCombinationwithDoubleJunction,Refillable

0-13 0to100 110 12

ECFG7379201B GlassBodyCombinationwithDoubleJunction,Sealed 0-13 0to110 110 12

ECFG7451901BGlassBodyCombinationwithAg/AgClReference,Sealed

0-14 5to110 110 12

35815-00FlexiphetSolid-State(Non-glass)EpoxyBodypHElectrode,FlatTip,NonFlowGelwithPTFEDiaphragm

0-14 -5to105 105 10

35815-10FlexiphetSolid-State(Non-glass)EpoxyBodypHElectrode,ConeTip,NonFlowGelwithPTFEDiaphragm

0-14 -5to105 105 10

35815-12FlexiphetSolid-State(Non-Glass)EpoxyBodypHElectrode,ConeTip,RefillableFlowwithPTFEDiaphragm

0-14 -5to105 105 10

35815-15FlexiphetSolid-State(Non-Glass)EpoxyBodypHElectrode,PiercingSharpTip,NonFlowGelwithPTFEDiaphragm

0-14 -5to105 50 10

ECFC

7960

1

ECFC

7960

25.1 ORPElectrodesChoosesinglejunctionelectrodesforfield,cleanwater,andothergeneralpurposeapplicationsordoublejunctionelectrodesforsamplescontainingheavymetalsandorganics.Platinumsensorsaresuitableformostgeneraluses,whilegoldsensorsareidealforcyanide/chromateandozoneapplications.

Model ECFC79602RMeasuringORPRange -1000to1000mV


ShaftMaterial Plastic

SensorType PlatinumPin




ShaftLength 115mm

Diameter 12mm

Model ECFC79602MeasuringORPRange -1000to1000mV


ShaftMaterial Plastic

SensorType PlatinumPin


ReferenceType Ag/AgClSealed


ShaftLength 115mm

Diameter 12mm

Model ECFC79601 ECFC79601RMeasuringORPRange -1000to1000mV -1000to1000mV



SensorType PlatinumPin PlatinumPin

ReferenceJunction SingleJunction SingleJunction


ShapeofMembrane Cylindrical Cylindrical


Diameter 12mm 12mm

page|20

5.0

Other Electrodes

ECFC

7960

2R

Model ECFE79601MeasuringORPRange -1000to1000mV


ShaftMaterial Epoxy

SensorType PlatinumBand


ReferenceType Ag/AgClSealed


ShaftLength 115mm

Diameter 12mm

page|21

ECFE79

601

Model ECFG7960101BMeasuringORPRange -1000to1000mV


ShaftMaterial Glass





ShaftLength 110mm

Diameter 12mm

Model ECFG7986101BMeasuringORPRange -1000to1000mV


ShaftMaterial Glass





ShaftLength 110mm

Diameter 12mm

ECFG

7986

101B

5.3 ISEGeneralApplicationGuide

page|22

ISE Applications Concentration RangeTemperature /pH Range

Interferences ElectrodeStandard 0.1M

Standard 100 ppm

Standard 1000 ppm

Ion Strength Adjuster

Ammonia NH3-HighPurityPowerStationWater,FishTanks,SeaWater,WasteWater,PlatingBaths,Air/StackGasesandBiologicalSamplesType: Gas Sensing

(17,000to0.001ppm)1.0to5x10-6M

0to50C/AbovepH11

VolatileAmines ECNH30101B ECSCSAA1BT ECSCSAA2BT ECSCSAA3BT ECISAAA1BT

Ammonium NH4 - BoilerFeedWater,NaturalWaterandFertilizersType: Polymer Membrane

(18,000to0.01ppm)1.0to5x10-6M

0to50C/pH4topH10

K+ ECNH40301B ECSCSAM1BT ECSCSAM2BT ECSCSAM3BT ECISAAM1BT

Bromide Br- - Water,Wine,Soil,PlantTissue,BloodandClinicalAnalysisType: Solid State

(79,000to0.4ppm)1.0to5x10-6M

0to50C/pH2topH14

S-2,1-,CN-,HighCl-andNH3Levels

ECBRO0301B ECSCSBR1BT ECSCSBR2BT - ECISABR1BT

Cadmium Cd+2- PlatingBathsType: Solid State

(11,200to0.01ppm)0.1to1x10-7M

0to80C/pH2topH12

Ag+,Hg+2,Cu+2,HighPB+2andFe+2Levels

ECCD0301B ECSCSCD1BT ECSCSCD2BT - ECISACD1BT

Calcium Ca+2 -WaterSofteningSystems,BoilerFeedWater,Drinking/MineralWater,ClinicalAnalysisandFoodApplicationsType: Polymer Membrane

(40,000to0.2ppm)1.0to5x10-6M

0to50C/pH3topH10

Pb+2,Hg+2,Cu+2,Ni+2,Fe+2,Mg+2,Zn+2,Ba+2,K+2,K+,Na+

ECCAL0201B ECSCSCA1BT ECSCSCA2BT ECSCSCA3BT ECISACA1BT

Carbon Dioxide CO2 and Carbonate CO3-2- SoftDrinks/CarbonatedBeverages,Wine,Beer,FermentationProcesses,BacterialCulturesType: Gas Sensing

(440to0.4ppm)1x10-2to1x10-4M

0to50C/pH4.8topH5.2

VolatileWeakAcids ECCO20101B ECSCSCO1BT ECSCSCO2BT ECSCSCO3BT ECISACO1BT

Chloride Cl-- River/TapWater,PlantTissue,Soils,BoilerFeedWater,ClinicalAnalysis,Sweat,Urine,Cement,PlatingBathsandFoodSamplesType: Solid State

(35,500to1.8ppm)1.0to5x10-5M

0to80C/pH2topH12

S-2,I-,CN-,Br-,OH-,NH3,S2O3-2 ECCLO0301B ECSCSCL1BT ECSCSCL2BT ECSCSCL3BT ECISACL1BT

Copper Cu+2- PlatingBathsandWaterType: Solid State

(6350to6.4x10-4ppm)0.1to1x10-8M

0to80C/pH2topH12

Ag+,Hg+2,HighCl-,Br-,Fe+2andCd+2Levels

ECCU0301B ECSCSCU1BT ECSCSCU2BT - ECISACU1BT

Cyanide CN-- PlatingBaths,WasteWaterandPlantTissueType: Solid State

(260to0.13ppm)5x10-6to10-2M

0to80C/pH11topH13

S-2,I-,Br-,Cl- ECCN0301B - - - -

Fluoride F-- Drinking/NaturalWater,WasteWater,Air/StackGases,Acids,SeaWaterMinerals,Soils,Food,BiologicalFluids,Toothpaste/MouthWash,Coal,CarbonatedBeveragesandBoneType: Solid State

0.02ppmtoSaturated(10-6toSaturated)

0to80C/pH5topH8

OH- ECFO0301B ECSCSFL1BT ECSCSFL2BT ECSCSFL3BT ECISAFL1BT

Iodide I-- Milk,Feeds,PlantsandPharmaceuticalsType: Solid State

(127,000to6x10-3ppm)5x10-8to1.0M

0to80C/pH0topH14

S-2,CN-,Br-,Cl-,NH3,S2O3-2 ECIO0301B ECSCSIO1BT ECSCSIO2BT - ECISAIO1BT

Lead Pb+2- PlatingBathsandOrganicCompoundsType: Solid State

(20,7000to0.2ppm)10-6to10-1M

0to80C/pH3topH8

Ag+2,Hg+2,Cu+2,HighCd+2andFe+2Levels

ECPB0301B ECSCSPB1BT ECSCSPB2BT - ECISAPB1BT

Nitrate NO3-- Surface/DrinkingWater,SewageEffluent,SoilExtracts,

Fertilizers,PlantTissue,Meat,Potatoes,Spinach,Beets,BabyFoodType: Polymer Membrane

(62,000to0.5ppm)7x10-6to1.0M

0to50C/pH2.5topH11

CIO4-,I-,CN-,BF4

- ECNO0301B ECSCSNT1BT ECSCSNT2BT ECSCSNT3BT ECISANT1BT

Potassium K+- WasteWater,River/TapWater,ClinicalAnalysis,Saliva,Serum,Fertilizers,SoilsandWinesType: Polymer Membrane

(39,000to0.04ppm)10-6to1.0M

0to50C/pH2topH12

Cs+,NH4+,Tl+,H+,Ag+,Li+,

Na+,Tris1+ECK0301B ECSCSKO1BT ECSCSKO2BT - ECISAKO1BT

Silver/Sulfide Ag+/S-2- SewageEffluent,Soils,Sediments,PlatingBathsandPhotographicFixingSolutionType: Solid State

(107,900to0.01ppm)10-7to1.0M(Ag+,S-2)

0to80C/pH2topH12

Hg+2 ECAGS0301B ECSCSSS1BT ECSCSSS2BT - ECISASS1BT

Sodium Na+- SteamCondensatesinPowerPlants,ClinicalAnalysis,Serum,Foods,Wine,Glass,SeaWater,SwimmingPools,FishFarmsandAquariumsType: Glass Bulb

(23,000to0.2ppm)10-6MtoSaturated

0to80C/pH5topH12

H+,K+,Li+,Ag+,NH4+,Rb+,

Cs+,Tl+ECNA0201B ECSCSLNA1BT ECSCSLNA2BT ECSCSLNA3BT ECISALNA1BT

5.2 IonSelectiveElectrodes(ISE)EutechoffersalargeselectionofIonSelectiveElectrodes(ISE)tosuitawidevarietyofapplications.Eachelectrodehasatypicalresponsetimeof20to30secondswhichvarieswithsolutionconcentration.Gassensingelectrodesalsoincludereplacementmembranes.Eutechoffersthreeelectrodetypes:Membrane/SolidState,GasSensing,orGlassbulb.

Choosefromsinglejunctionordoublejunctionelectrodes.Singlejunctionelectrodesareidealforcleanwaterapplications.Usedoublejunctionelectrodesfortestingdirtywaterandsolutionswithheavymetalsororganics.Allelectrodesarerefillableandinclude15mlofelectrolyte,fillingpipetteandinstructions.Solidstateelectrodesalsoincludepolishingstrips.

IonSe

lectiveElectrod

e

page|23

ISE Applications Concentration RangeTemperature /pH Range

Interferences ElectrodeStandard 0.1M

Standard 100 ppm

Standard 1000 ppm

Ion Strength Adjuster

Ammonia NH3-HighPurityPowerStationWater,FishTanks,SeaWater,WasteWater,PlatingBaths,Air/StackGasesandBiologicalSamplesType: Gas Sensing

(17,000to0.001ppm)1.0to5x10-6M

0to50C/AbovepH11

VolatileAmines ECNH30101B ECSCSAA1BT ECSCSAA2BT ECSCSAA3BT ECISAAA1BT

Ammonium NH4 - BoilerFeedWater,NaturalWaterandFertilizersType: Polymer Membrane

(18,000to0.01ppm)1.0to5x10-6M

0to50C/pH4topH10

K+ ECNH40301B ECSCSAM1BT ECSCSAM2BT ECSCSAM3BT ECISAAM1BT

Bromide Br- - Water,Wine,Soil,PlantTissue,BloodandClinicalAnalysisType: Solid State

(79,000to0.4ppm)1.0to5x10-6M

0to50C/pH2topH14

S-2,1-,CN-,HighCl-andNH3Levels

ECBRO0301B ECSCSBR1BT ECSCSBR2BT - ECISABR1BT

Cadmium Cd+2- PlatingBathsType: Solid State

(11,200to0.01ppm)0.1to1x10-7M

0to80C/pH2topH12

Ag+,Hg+2,Cu+2,HighPB+2andFe+2Levels

ECCD0301B ECSCSCD1BT ECSCSCD2BT - ECISACD1BT

Calcium Ca+2 -WaterSofteningSystems,BoilerFeedWater,Drinking/MineralWater,ClinicalAnalysisandFoodApplicationsType: Polymer Membrane

(40,000to0.2ppm)1.0to5x10-6M

0to50C/pH3topH10

Pb+2,Hg+2,Cu+2,Ni+2,Fe+2,Mg+2,Zn+2,Ba+2,K+2,K+,Na+

ECCAL0201B ECSCSCA1BT ECSCSCA2BT ECSCSCA3BT ECISACA1BT

Carbon Dioxide CO2 and Carbonate CO3-2- SoftDrinks/CarbonatedBeverages,Wine,Beer,FermentationProcesses,BacterialCulturesType: Gas Sensing

(440to0.4ppm)1x10-2to1x10-4M

0to50C/pH4.8topH5.2

VolatileWeakAcids ECCO20101B ECSCSCO1BT ECSCSCO2BT ECSCSCO3BT ECISACO1BT

Chloride Cl-- River/TapWater,PlantTissue,Soils,BoilerFeedWater,ClinicalAnalysis,Sweat,Urine,Cement,PlatingBathsandFoodSamplesType: Solid State

(35,500to1.8ppm)1.0to5x10-5M

0to80C/pH2topH12

S-2,I-,CN-,Br-,OH-,NH3,S2O3-2 ECCLO0301B ECSCSCL1BT ECSCSCL2BT ECSCSCL3BT ECISACL1BT

Copper Cu+2- PlatingBathsandWaterType: Solid State

(6350to6.4x10-4ppm)0.1to1x10-8M

0to80C/pH2topH12

Ag+,Hg+2,HighCl-,Br-,Fe+2andCd+2Levels

ECCU0301B ECSCSCU1BT ECSCSCU2BT - ECISACU1BT

Cyanide CN-- PlatingBaths,WasteWaterandPlantTissueType: Solid State

(260to0.13ppm)5x10-6to10-2M

0to80C/pH11topH13

S-2,I-,Br-,Cl- ECCN0301B - - - -

Fluoride F-- Drinking/NaturalWater,WasteWater,Air/StackGases,Acids,SeaWaterMinerals,Soils,Food,BiologicalFluids,Toothpaste/MouthWash,Coal,CarbonatedBeveragesandBoneType: Solid State

0.02ppmtoSaturated(10-6toSaturated)

0to80C/pH5topH8

OH- ECFO0301B ECSCSFL1BT ECSCSFL2BT ECSCSFL3BT ECISAFL1BT

Iodide I-- Milk,Feeds,PlantsandPharmaceuticalsType: Solid State

(127,000to6x10-3ppm)5x10-8to1.0M

0to80C/pH0topH14

S-2,CN-,Br-,Cl-,NH3,S2O3-2 ECIO0301B ECSCSIO1BT ECSCSIO2BT - ECISAIO1BT

Lead Pb+2- PlatingBathsandOrganicCompoundsType: Solid State

(20,7000to0.2ppm)10-6to10-1M

0to80C/pH3topH8

Ag+2,Hg+2,Cu+2,HighCd+2andFe+2Levels

ECPB0301B ECSCSPB1BT ECSCSPB2BT - ECISAPB1BT

Nitrate NO3-- Surface/DrinkingWater,SewageEffluent,SoilExtracts,

Fertilizers,PlantTissue,Meat,Potatoes,Spinach,Beets,BabyFoodType: Polymer Membrane

(62,000to0.5ppm)7x10-6to1.0M

0to50C/pH2.5topH11

CIO4-,I-,CN-,BF4

- ECNO0301B ECSCSNT1BT ECSCSNT2BT ECSCSNT3BT ECISANT1BT

Potassium K+- WasteWater,River/TapWater,ClinicalAnalysis,Saliva,Serum,Fertilizers,SoilsandWinesType: Polymer Membrane

(39,000to0.04ppm)10-6to1.0M

0to50C/pH2topH12

Cs+,NH4+,Tl+,H+,Ag+,Li+,

Na+,Tris1+ECK0301B ECSCSKO1BT ECSCSKO2BT - ECISAKO1BT

Silver/Sulfide Ag+/S-2- SewageEffluent,Soils,Sediments,PlatingBathsandPhotographicFixingSolutionType: Solid State

(107,900to0.01ppm)10-7to1.0M(Ag+,S-2)

0to80C/pH2topH12

Hg+2 ECAGS0301B ECSCSSS1BT ECSCSSS2BT - ECISASS1BT

Sodium Na+- SteamCondensatesinPowerPlants,ClinicalAnalysis,Serum,Foods,Wine,Glass,SeaWater,SwimmingPools,FishFarmsandAquariumsType: Glass Bulb

(23,000to0.2ppm)10-6MtoSaturated

0to80C/pH5topH12

H+,K+,Li+,Ag+,NH4+,Rb+,

Cs+,Tl+ECNA0201B ECSCSLNA1BT ECSCSLNA2BT ECSCSLNA3BT ECISALNA1BT

pH Buffer SolutionspHbuffersolutions,availablein480mland1lleak-proofbottles.BuffervaluesincludepH1.68,4.01,7.00,9.00,10.01and12.45.Colouredcodedbufferswithdispensertopsareavailableinselectedmodelsforinstantrecognition:pH4-red,pH7-yellowandpH10-blue.Theseareavailablein480mland1lbottles.CertificateofAnalysiscanbedownloadedfromourwebsitehttp://www.eutechinst.com.

pH Buffer SachetsSingleusebuffersachetsarevacuum-sealedandair-tightwith0.01pHaccuracyat25C.TheseNIST-traceablebuffersareshippedinaboxof20sachets.TheavailablevaluesarepH4,7,10anddeionisedwaterforrinsing.Simplyinserttheelectrodeintoabuffersachet,calibrate, rinseanddiscardusedsolutionsproperlywhendone.Nowastageandcontamination-free;convenientforlaboratoryandoutdooruse.

Reference Refilling ElectrolyteSeveral typesof referencefill solutionsareavailable: 4MKCl saturated (withAgCl) forAg/AgCl single junctionelectrodes;4M KCl saturated for Ag/AgCl double junction electrodes or 4M KCl for Calomel (Hg/Hg2Cl2) electrodes and otherspecialtyelectrodes.

Electrode Cleaning & Storage SolutionsRemoveproteinorgreaseandoildepositsfromelectrodeswithcleaningsolutionwhichcontainspepsin.Aftercleaningorwhentheelectrodeisnotinuse,alwayskeeppHelectrodesinsomestoragesolutiontoensureproperworkingcondition.

Flexible Electrode HolderTheelectrodeholderclaspsuptofourstandardelectrodes(14mmdia.max)andoneATCprobewithaswivelarmthatcanbe rotated360. It also allowsanypositioningof electrodes at a constant vertical angle - eithermoving side-to-sideorup-and-downforaddedconvenience.

page|24

6.0

Accessories FlexibleElectrodeHolderpHBufferSachetspHBufferSolutions

7.1 MeasurementSystemandCalibrationpH MeterThepHmeterfunctionsasaspecializedvoltmetercapableofaccuratelymeasuringsmallvoltagechangesatextremelyhighimpedanceofpHelectrodeandadjuststopHandvoltagecharacteristicsoftheelectrodesystem.

MostmodernpHmeters incorporateautomaticor/andmanual temperaturecompensation tocorrect for variation inpHvalueofagivensolutionwithsampletemperature.Newermicroprocessor-basedmetersareprogrammedtosolvetheNernstequation,takingintoaccountelectrodevoltage,efficiencyandtemperature.Mostmetersprovideautomaticbufferrecognitionforcalibration,errormessagesanddiagnosticcircuitrytosimplifyoperationandreduceoperatorerror.

Calibration BuffersThesestandardsolutionsofknownpHvalueareusedtoadjustthepHmeter/electrodesystemtodisplayprecisemeasurements.Buffersareavailableasready-to-usesolutions,insachetsandcapsules.AllbuffershavethespecialcharacteristicofresistingpHchangeupondilutionoracid/basecontaminationtoacertainextent.SomesolutionsarestandardizedagainstNIST-certifiedpHreferencesforcalibratingmeterswithresolutionupto0.001pH.

Electrode SystemTheelectrodesystemconsistsoftwohalfcells:apHindicatingelectrode,whichdevelopsapotentialdependentonthepHofasolution,andareferenceelectrodewhichprovidesaconstantpotentialandcompletestheelectricalcircuit.Nowadayscombinationelectrodes-bothhalfcellsjoinedcoaxially-arefrequentlyusedfortheconvenienceandcompactnesstheyoffer.

CalibrationTheelectrodemustbecalibratedregularlytoensureaccurate, repeatablemeasurementswithavarietyofcommercialpHcalibrationbuffersolutions.

Foroptimalaccuracy,calibrationorstandardizationshouldbeperformedwithfreshbufferofpHvalueclosetothatofthesampletobetested.WhenthesamplepHisunknown,atwo-pointcalibrationisperformed:firstwithpH7(closetotheelectrodeszero-potentialpoint),followedbyanacidorbasebufferwhosevaluebracketstheexpectedpHvalueofthesample.Althoughone-pointcalibrationsufficesforfairlyreliablemeasurement,three-pointorevenfive-pointcalibrationsyieldthemostaccurateresultsacrosstheentiremeasurementrange.MakesurethepHmetercatersforachoiceofpHcalibrationbufferset,namelytheUSA,NISTorDINreferencebufferstandards.

page|25

7.0

Maintenance and Technical Tips

pH Electrode Anatomy

1 Cable

2 Cap

3 FillHole

4 Body-GlassorEpoxy

5 OuterReference ChamberFilledwith InternalFillSolution

6 Ag/AgCIWire

7 AnnularReference JunctionAllows ReferenceSolution toLeak

8 InnerReference Chamber

9 OuterReference Chamber

10 pHSensingBulb

Double Junction

SingleJunction

page|26

7.2 TestingofpHMeterandElectrodepH Meter with mV (Millivolt) ReadoutAttachashortedBNCcaptothemetersBNCinputandchangethepHtomVmeasurementmode.ThemVreadingshouldreadabout0.0mV.Ifthemeasuredreadingexceeds0.2mV,themetershouldbeelectronicallycalibrated.

ElectrodeConnectpHelectrodetopH/mVmeterandtoggletomVmeasurementmode.ImmerseelectrodeandcalibrateusingafreshpH7bufferfirst,thenrinsewithdeionisedwater,followedbyeitherpH4orpH10calibration.Whendone,checktheslope/offsetdisplayofthemeterfordiagnosisofelectrodecharacteristicsAlternativelyifthemeterdoesnotofferslope/offsetdisplayfunction,determinethepercentageofelectrodesslope.Forexample,ifpH7yields-5.0mV,andatpH4themVreadingis165mV,thenetchangeis170mV.Dividethisvalueby177.5,andmultiplyitby100todeterminethe%ofelectrodesslope(i.e.95.7%).Fornewelectrodes,theirslopeshouldbebetween95%and102%.Iftheslopefallsbelow92%,cleantheelectrode.

7.3 UseandCareofElectrodesMaintenance and Storage of pH ElectrodesElectrodesaredelicatemeasuringinstrumentsthatrequirepropercareandmaintenancetoproduceaccurateandreliableresults,andtoprolongusefullife.

AlwayskeepthepHelectrodemoistwhennotinuseforaperiodoftime,byusinganelectrodestoragesolutionorapH7bufferasstoragemediatosoaktheelectrode.DONOTstoretheelectrodeindistilledordeionisedwaterasthiswillcauseionstoleachoutoftheglassbulbandreferenceelectrolyte,causingslowandsluggishresponse.

Electrodesmaybeshippedwitheitherprotectivecapsorinelectrodesoakingbottlestopreventcrackingorscratching,andtokeeptheglassbulbsmoist.Removetheelectrodegentlyfromthestoragebottleandrinseitwithdistilledwaterbeforeuse.Forlong-termstorage,alwayskeeptheelectrodeinthebottle,filledwithsufficientstoragesolutiontocoverthebulb.Replenishthebottleasneeded. HandlingTheelectrodeshouldberinsedthoroughlybetweensamplemeasurementsandcalibrationswithdistilledordeionisedwater.Blottheelectrodedrytogentlydislodgeexcesswater.Usea lint-freewipingpaperasrubbingcausestheelectrodetobechargedelectrostatically.Neverusepolymerorplasticbodyelectrodesinsamplescontainingorganicsolvents.

Refillable ElectrodesThefillingsolutioninrefillableelectrodesshouldbefilledupto,butnotpast,therefillhole.Makesurethattherefillholeisopenwhenmeasuringtoensurethatthefillsolutionflowsproperlythroughthereferencejunction.

7.4 RejuvenationandReconditioningofElectrodesAselectrodesage,theirefficiencyisreduced.Symptomsincludesluggishorerraticreadings.Thisagingisusuallycausedeitherbycontaminationoftheglassmembrane,orbyblockageoftheliquidjunctionreference.Belowareafewremedialprocedurestoimprovetheperformanceofsuchelectrodes.

Unblocking Reference JunctionAblockedorcloggedreferencejunctionattributestoabout80%ofallpHmeasurementdifficulties;resultinginextremelyslowresponse,off-scalereadingsandelectricallynoisymeasurements.Proceduresforunblockingthejunctiondependonthetypeofreferencejunctionelectrodeinuse:

Gel-Filled Electrodes Soaktheelectrodeinwarmwater(about60C)for5to10minutestore-establishcontact.Orplacetheelectrodeinwarm saturatedKClsolution(60C)andallowbothelectrodeandsolutiontocooldowntoroomtemperature.

Liquid-Filled Electrodes |SleeveandAnnularJunction| Draintheelectrode,rinsethecavitywithdistilledwaterandrefillitwithfreshelectrolyte.Forsleeve-typeelectrodes,rotatethe sleevetore-establishflowifnecessary.

Ceramic Junction |ForCalomelTypesOnly| Soaktheelectrodeinwarmwaterforabout10minutes,andcheckforelectrolyteflow.Alternatively,soaktheelectrodetipin concentratedHClfor5to10minutes(useadequateventilationandprecautionarymeasureswhenperformingthistask).Rinse theelectrode,thencheckforelectrolyteflowagain.

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Order No. Stock Code ItemECBU1BT 01X211211 ColourlesspH1.68BufferSolution(480ml)ECBU4BT 01X211201 ColourlesspH4.01BufferSolution(480ml)ECBU7BT 01X211202 ColourlesspH7.00BufferSolution(480ml)ECBU9BT 01X211222 ColourlesspH9.00BufferSolution(480ml)ECBU10BT 01X211203 ColourlesspH10.01BufferSolution(480ml)ECBU12BT 01X211212 ColourlesspH12.45BufferSolution(480ml)ECBU4BTC 01X211204 RedColourCodedpH4.01BufferSolution(480ml)ECBU7BTC 01X211213 YellowColourCodedpH7.00BufferSolution(480ml)ECBU10BTC 01X211205 BlueColourCodedpH10.01BufferSolution(480ml)ECBU4BTC1LIT 01X211233 RedColourCodedpH4.01BufferSolution(1Litre)ECBU7BTC1LIT 01X211234 YellowColourCodedpH7.00BufferSolution(1Litre)ECBU10BTC1LIT 01X211235 BlueColourCodedpH10.01BufferSolution(1Litre)ECBU4BS 01X223102 NIST-TraceablepH4.01BufferSachets(Packof20Pcsx20ml)ECBU7BS 01X223101 NIST-TraceablepH7.00BufferSachets(Packof20Pcsx20ml)ECBU10BS 01X223103 NIST-TraceablepH10.01BufferSachets(Packof20Pcsx20ml)ECRINWT 01X223201 NIST-TraceableDeionisedRinseWaterSachets(Packof20Pcsx20ml)ECORPQUIN 01X062700 ORPQuinhydrone255mV(480ml)ECORPQUIN086 01X211215 ORPQuinhydrone86mV(480ml)ECORPPRE 01X081500 ORPPre-Treatment475mV(480ml)ECRE001 01X211208 RefillingElectrolyteforSingleJunctionAg/AgClElectrodes(480ml)ECRE002 01X211218 RefillingElectrolyteforDoubleJunctionAg/AgClElectrodes(480ml)ECRE005 01X211206 ElectrodeStorageSolution(480ml)ECRE006 01X370502 ElectrodeStorageSolutionForEutech620SeriesECDPCBT 01X211216 ProteinRemovalSolution(480ml)ECPHELSTDC 01X081600 FlexibleElectrodeHolderwithSwivelArm

Solutions

Ordering Information

|ForSilver/SilverChlorideTypesOnly| SoaktheelectrodeinwarmsaturatedKClsolution(60C)forabout10minutes,andcheckforelectrolyteflow.Alternatively, soaktheelectrodetipinconcentratedammoniumhydroxidefor5to10minutes(useadequateventilationandprecautionary measureswhenperformingthistask).Rinsetheelectrode,thencheckforelectrolyteflow.

|ForCeramicJunctionsOnly| If the junction remains clogged,gently sand the junctionarea (becarefulnot to touch theglassbulb), andcheck for electrolyteflow.

Cleaning Glass pH MembraneDirtyglassmembranesareusuallyindicatedbybeadsofwaterformingonthebulbwhenrinsingwithdistilledwater.Thebulbcanbecleanedasfollows:-

For Protein SoakinfreshproteinremovalsolutionECDPCBTfor30minutes,rinsethoroughlybeforeuse.

For Inorganic Deposits WashwithEDTA,ammoniaoracids

For Grease and Similar Films Washwithacetone,methanol,etc.

Reconditioning Glass pH MembraneProlongeduse,excessivealkaline immersion,orhightemperatureoperationwillcausesurface leachingofthemembraneglass;resultinginerraticorsluggishresponsewhichcannotberemediedbyclearingtheelectrode.Immersetheelectrodetipinto0.1NHClforlessthan5minutes,andrinsewithwater.Thenimmersetheelectrodetipinto0.1NKOHfor5minutes,andrinsethoroughlywithwater.Checkforelectrodesperformance.Iftheproblempersists,repeatthestepsbutnotethatfrequentHCl/KOHtreatmentcanshortentheelectrodelife.

We reserve the right to make changes, improvements and modifications to products shown.

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