Extech Instruments WQ500 User manual

Brand: Extech Instruments

Model: WQ500

Category: Measuring, testing & control

Type: User manual

This manual is also suitable for

WQ510
WQ530

USERGUIDE



WQSeriesWaterQualityBench‐topMeters



ModelWQ500pH,ORPandTemperature



ModelWQ510pH,ORP,Conductivity,TDS,Salinity,&Temperature



ModelWQ530pH,ORP,Conductivity,TDS,Salinity,DO,&Temp.



WQ500 Series-en-GB_V1.3 9/15

Introduction

CongratulationsonyourpurchaseoftheWQseriesmeter.Thisbenchtopdeviceemploys

leadingedgetechnologywithintegratedmicroprocessorformeasuringpH,ORP,Conductivity,

DO,Salinity,TDS,andTemperature(dependingonmodel).Thesedevicescanstore150labeled

readingsforrecallatalatertimeandincludesaMAX‐MINmemoryfeature.Inaddition,theWQ

seriesmetersofferaPCinterfacefordatatransferandotherremotefunctionality.Thismeteris

shippedfullytestedandcalibratedand,withproperuse,willprovideyearsofreliableservice.

Pleasevisitourwebsite(www.extech.com)tocheckforthelatestversionofthis

UserGuide,

ProductUpdates,andCustomerSupport.



FEATURES

 Microprocessorbaseddevicewithruggedhousingandsplash‐proofkeyboard

 LargebacklitLCDdisplay

 AutomaticTemperatureCompensation(ATC)

 ManualSalinityandAltitudeCompensation

 Memoryfunctionstoresandrecallsupto150datapoints

 MAX‐MINstoreandrecall

 DataLock

 Uniquemeasurementplatform

andelectrodeholder

 9VDCuniversalACadapter(UA100‐240)

 PCinterfaceforcapturingmeasurementdata



SUPPLIEDACCESSORIESANDEQUIPMENT

 WQ500:

pHglasselectrode,Temp.probe,Buffer7.00x100ml,Buffer4.01x100ml,Electrodeclamp

&rod,SoftwareandUSBcable,AC/DCadaptor,Instructionmanual,Giftbox,Stirrer

 WQ510

pHglasselectrode,Conductivitycell,Temp.probe,Buffer7.00x100ml,Buffer4.01x

100ml,1413μSx100ml,

12.88mSx100ml,Electrodeclamp&rod,SoftwareandUSBcable,

AC/DCadaptor,Instructionmanual,Giftbox,Stirrer

 WQ530

pHglasselectrode,Conductivitycell,DOprobe,Temp.probe,Membranecapx4pcs,Buffer

7.00x100ml,Buffer4.01x100ml,1413μSx100ml,12.88mSx100ml,Electrolyte

x50ml,

Plasticburette,Sandpaper,Electrodeclamp&rod,SoftwareandUSBcable,AC/DCadaptor,

Instructionmanual,Giftbox,Stirrer



WQ500 Series-en-GB_V1.3 9/15

Descriptions



METERDESCRIPTION

1. LCDDisplay

2. PrimaryKeypad

3. SecondaryKeypad

4. SecondaryKeypadlegend

5. BeakerTestPlate

6. RearConnectionaccess

7. Electrodeholderpost

8. Electrodeholder



LCDDESCRIPTION

1. Measurementtype

2. PrimaryReadingDisplayarea

3. CalibrationMode

4. Calibrationerrorindicator

5. Readingstoredindicator

6. MAX/MINmodeicons

7. RecallMode

8. Lockmodeicon

9. Temperaturereading

10. Autotemperaturecondensation

11. Unitsofmeasureicons





WQ500 Series-en-GB_V1.3 9/15

KEYPADDESCRIPTION

LockthecurrentreadingontheLCD.

Pressandholdfor3secondstoenterorexitMAX/MINmode.

InMAX/MINmode,presstobrowseMAXandMINreadings.

Storethecurrentreading.

Pressandholdfor3secondstoenterRecallmode.

InRecallmode,usetheupanddownarrowstobrowserecords.

Press and hold simultaneously for 3 seconds to enter the advanced

settingmode(seeAdvancedSettingssection).

Selectameasurementfunction.

Press andholdfor3 seconds to switchC/ForswitchpH‐mVor ORP‐

mV(inORPmode),orswitchmg/Ltoppm(inDOmode)

SwitchPowerONorOFF.

Pressandholdfor3secondstoentertheCalibrationmode



1. Increasestirrerspeed

2. Decreasestirrerspeed

3. Presstoturnonthestirrerorsetstir

mode(30,60,120minutesor

continuously);Press3sec.toturnoff

thestirrer

4. StirmodeLEDindicator:30,60,120

minutesorstircontinuously.

WQ500 Series-en-GB_V1.3 9/15

Preparation

pH,ORP,Conductivity,TDS(TotalDissolvedSolids),andSalinity

1. ConnectACadaptertoapowersource.

2. Removetheprotectioncapfromtheelectrodeandconnecttotheinputconnector.

3. Connectthetemperatureprobetothemeterandpoweron.

4. Rinsetheelectrodewithcleanwaterandwipedry.

DO(DissolvedOxygen)

1. ConnecttheDOprobeandtemperatureprobetothemeterandremovetheprotectivecap.

2. Carefullyremovethemembranecap.

3. Fillmembranecapwiththeelectrodesolutiontothebottomofthethreads insidethecap.

4. PressthePowerbuttontoswitchthemeterON.

CalibrationandOperation

pHCalibration(NOTE:ORPdoesnotrequirecalibration)

Beforeaccuratemeasurementscanbeobtained,itisnecessarytocalibratethemeterwiththe

electrode.Typically,pH7iscalibratedfirstandthenoneormoreoftheotherbuffers.

1. ConnectthepHelectrodetothemeter’sBNCconnectorinput.

2. DiptheelectrodeandtemperatureprobeintothepH7.00buffersolution.Stirgentlyand

waitforastablereading.

3. PressandholdthePowerbuttonfor3secondstoentercalibrationmode.

4. TheLCDwilldisplayCALanda 7.00willflash.

5. WhencalibrationiscompletethedisplaywillstopflashingandshowSA

thenEND.

6. Themeterwillnowreturntonormaloperatingmode.

7. Rinsetheelectrodeandwipedry.DiptheelectrodeinpH4.01orpH10.01.TheLCDwill

indicateapercentageofslope(PTS)toshowthestatusoftheelectrode.

8. IfPTSisbelow70%

orabove130%theelectrodemustbereplaced.Aslopeof100%isideal.

Notes:

1. Calibrationerrorindicatoriconwillappear(ErrinsteadofSA)ifcalibrationfails.

2. Whendoinga2or3pointcalibration,calibratewithbufferpH7first,andthenfollowwith

bufferpH4orpH10.

3. pHcalibrationtype“USA”or“NIST”canbechangedintheAdvancedSettingmode(seethe

AdvancedSettingssection).

4. Thecalibrationpointsfor“USA”are1.68,4.01,7.00,10.01and12.45.

5. Thecalibrationpointsfor“NIST”are1.68,4.01,

6.86,9.18and12.45.

WQ500 Series-en-GB_V1.3 9/15

ORPCalibration

CalibrationisnotnecessaryforORP.However,ORPshouldbeverifiedwithORPstandardsolution

tocheckwhethertheelectrodeisinproperworkingorderornot.

Conductivity,TDS,andSalinityCalibration

1. DiptheConductivitycellandthetemperatureprobeintothestandardsolution1413μS/cm.

2. Stirgentlyandwaituntilthereadingisstable.

3. Press and hold the Power button for 3 sec. to enter the calibration mode. The display will

showCALand1413μS/cmwillflash.

When calibration is complete the display will stop flashing and indicate SA, then End. The

meterwillthenreturntothenormaloperatingmode.

Notes:

1. Calibratingwith12.88mS/cmstandardsolutionisbetterformeasuringwithhighconductivity

solutions.

2. TheiconCONDwilldisplayautomaticallyduringcalibrationmode.

3. Calibrationerrorindicatoriconwillappear(ErrinsteadofSA)ifcalibrationfails.

4. Ifthereadingisnot0μS/cmwhilethecellisinair(notdippedintoanysolution),calibratein

airtoobtainareading

of0μS/cm.

5. The Conductivity calibration points are: 0, 84μS/cm, 1413μS/cm, 12.88mS/cm and

80.0mS/cm.

DOCalibration

1. WiththeDOprobeattached,pressPowerbuttontoturnonmeterandthenpressMODEto

selectO2mode.

2. Wait10to30minutesfortheprobetopolarize.Thereadingshouldbeapprox.101.7%

(saturation)aftertheprobehascompletelypolarized

3. Removetheprobe.PressandholdPowerfor3sec.toentercalibrationmode.Thedisplaywill

showCALand101.7%willflash.

ThedisplaywillstopflashingandindicateSA,thenEndwhen

calibrationiscomplete.Themeterwillreturntothenormaloperatingmode.

4. Optional’zerooxygen’calibration:(improvesmeasurementaccuracyforveryloworveryhigh

DOmeasurements).Placetheprobeintoazerooxygencalibrationsolution,suchas

5%

sodiumsulfite,waitforstabilityandpressandholdPowertoentercalibration.Stabilityina

zerosolutionmaytakemanyminutes,dependingonprobehistory.

Note:

1. TheiconO2willdisplayautomaticallyduringcalibrationmode.

2. Calibrationerrorindicatoriconwillappear(ErrinsteadofSA)ifcalibrationfails.

3. Ifthe reading is not0%when the probe is disconnected,calibrateitin air without probe to

obtainareadingof0%.



WQ500 Series-en-GB_V1.3 9/15

pHMeasurement

1. PressMODEtochoosepHmode.

2. Aftercalibration,rinsethepHelectrodewithcleanwaterandwipeitdry.

3. Dip the  electrode and the temperature probe into the sample solution that is going to be

measured.

4. Stirgentlyandwaituntilastablereadingcanbeobtained.



ORPMeasurement

1. InserttheORPelectrode,andpressMODEtochooseORPmode.

2. RinsetheORPelectrodewithcleanwaterandwipeitdry.

3. Diptheelectrodeintothesamplesolutionthatisgoingtobemeasured.

4. Stirgentlyandwaituntilastablereadingcanbeobtained.

Notes:



1. Thedisplaywillshow“‐‐‐‐”inanover‐rangecondition.

2. Aftermeasurement,rinsetheelectrodewithcleanwater.

3. Replacethesoakingbottle.Thebottleshouldalways be filledwithsoakingsolution(4MKCL).

COND,TDS,SalinityMeasurement

1. InsertConductivitycell,andpressMODEtochooseCOND,TDSorSaltmode.

2. Aftercalibration,rinsetheconductivitycellwithcleanwaterandwipeitdry.

3. Dip the  electrode and the temperature probe into the sample solution that is going to be

measured.

4. Stirgentlyandwait

untilastablereadingcanbeobtained.

Notes:

1. Thedisplaywillshow“‐‐‐‐”inanover‐rangecondition.

2. Themeterauto‐rangestoμS/cmormS/cm,orppmorppt.

3. Aftermeasurement,rinsethecellwithcleanwaterandreplacetheprotectivecap.

4. Donot

touchorwipethesurfaceoftheinnerblackplateoftheconductivitycell.

DOMeasurement

1. RemovetheprotectioncapandturnonthepowerandpressMODEtochooseO2mode.Wait

10to30minutesfortheprobetopolarize.Thereadingshouldbeapprox.101.7%(saturation)

aftertheprobehascompletelypolarized.

2. SelectthedesiredunitsofmeasurebypressingMODEuntil

theproperunitsareshowninthe

display.

3. Placetheprobeinthesampletobemeasured.Stirtheprobeinthesampletoremoveany

trappedairbubblesfromthemembranesurface.

4. Allowthemetertimetosettletothefinalmeasurementvalue.

WQ500 Series-en-GB_V1.3 9/15

Notes:

1. Thelargerthedifferenceintemperaturebetweentheprobeandthesolution,thelongerit

willtakeforthereadingtostabilize.Stabilizationtimecanvaryfromten(10)secondstofive

(5)minutes.

2. Covertheprobewiththeprobecap.Thespongecontainedinthecapshould

bemoistened

(notsoaked)withDI(distilledwater)orcleantapwater.

150‐ReadingMeasurementStoreandRecall

1. PresstheSTORE/RECALLbuttontostorethecurrentreading.Presseachtimeareadingisto

bestored.TheSTOREiconappearsasareadingisstored.

2. Ifanattemptismadetostoremorethan150readings,thestoredreadings(startingwiththe

firstreading)willbeoverwritten.

3. Torecallreadings,pressandholdtheSTORE/RECALLbuttonuntilthe‘RECALL’iconappears

ontheLCD.Usetheup/downarrowbuttonstoscrollthroughthestoredreadings.

4. Toexitthismode,pressSTORE/RECALLtoreturntonormaloperatingmode.

5. Pressandholdtheupanddownbuttonssimultaneouslyfor3secondstoclearthememory.

MAX/MINMemoryDisplay

1. Themetermemorizesthehighest(MAX)andlowest(MIN)readingswhenprompted.

2. PressandholdtheMAX/MINbuttonuntilboththeMAXandMINiconsappearflashingon

theLCD.ThemeterwillnowbeginkeepingtrackoftheMINandMAXreadings.

3. ToviewMAX/MINvalues,presstheMAX/MINbuttonagain;themeterautomatically

displaysthehighestandlowestreadingsinsuccessionandthenreturnstotheMAX/MIN

recordingmode.

4. ToexittheMAX/MINmode,pressandholdtheMAX/MINbuttonuntiltheMAXandMIN

iconsdisappear.

WQ500 Series-en-GB_V1.3 9/15

AdvancedSettings

InpH,TDS,orDOmodepresstheupanddownarrowssimultaneouslyfor3secondstoenterthe

AdvancedSetupmode.

pHAdvancedSettings

1. InpHsettingmode,pressSTORE/RECALLbuttontosetthepHcalibrationtype.Usetheup

anddownarrowstoselectUSAorNIST.USAandNISTcalibrationpointsdiffer,refertothe

Calibrationsectionofthisguideforcomparisonofcalibrationpoints.

2. PressMODEtosavesettingandreturntonormaloperatingmode.

3. PressLOCK/MAXMINtoturnAUTOLOCKONorOFF.Usetheupanddownarrowstoselect

ONorOFF.InAutoLockmodethekeypadislockedandcannotbetampered.

4. PressMODEtosavesettingandreturntonormaloperatingmode.

TDSAdvancedSettings

1. PressSTORE/RECALLtosettheratiobetweenconductivityandTDS.

2. Usetheupanddownarrowstoadjusttheratiofrom0.5to1.0andthenpressMODEtosave

settingandreturntonormaloperatingmode.

DOAdvancedSettings

1. PressSTORE/RECALLtosetthesaltcompensation.Usetheupanddownarrowstoadjustthe

valuefrom0to50ppt.

2. PressMODEtosavesettingandreturntonormaloperatingmode.

3. PressLOCKtosetthealtitudecompensation.Usetheupanddownarrowstoadjustthe

valuefrom0to7000m(20000ft.).

4. PressMODEtosavesettingandreturntonormaloperatingmode.

Note:Inanyadvancedsettingmode,pressthepowerbuttontoresetallsettingsbacktofactory

setup(exceptpHcalibrationandAutolock)



PCInterface

ThisWQseriesmetercanbeconnectedtoaPCfordatatransferandotherremotefunctionality.

PleaserefertothePCInterface SoftwareInstructions suppliedontheincludedprogramCD‐ROM

and/ortheinstructionsprovidedintheHELPUtilityoftheSoftwareProgramitselfonceitis

opened.Pleasecontact

ourCustomerCareTechnicalSupportdepartmentforfurtherPC

interface‐relatedassistance.Checkthewebsitewww.extech.comsoftwaredownloadpagefor

thelatestversionofprogramandfortheoperatingsystemcompatibility.



WQ500 Series-en-GB_V1.3 9/15

MembraneCapReplacement

IMPORTANTNOTE:OnlytheelectrolytesolutionsuppliedbyExtechwillworkcorrectlyforthis

probe.Ifathirdpartysolutionisused,theprobewillnotworknormally.

1. Donottouchthemembraneasskinoilswillinterferewiththeoxygenpermeabilityrateofthe

membrane.Replacethecapcarefully.



2. Itisrecommendedthattheproberemainattachedtothemeterduringthisreplacement

process.

3. Unscrewthecapfirmlyandcarefullyfromtheprobe.

4. RinsetheoldelectrolytesolutionfromtheCathodeandAnode.

5. UsethesuppliedPolishingStripstoclean,polish,shine,and/orremovescratches

fromthe

cathode.Besuretomoistentheclothbeforepolishingthecathode.Donotover‐polishthe

sensitivegoldcathode.

6. Setthenewreplacementmembranecaponaflatsurface.Leavethecapinthisposition

duringthereplacementprocess.

7. Fillthemembranecapwiththeelectrolytesolution

uptothebottomofthethreadsonthe

insideofthecap.

8. Tapthemembranecaptoreleaseandpreventairbubbleinelectrolytesolution.

9. Keepingthecapinafixedpositiononaflatsurface,carefullyinserttheprobeintothenew

capbyfirstdipping

andremovingtheprobeseveraltimesfromthecap.Witheachdip,push

theprobeprogressivelydeeperintothebondedcap.Finally,screwtheprobeslowlyontothe

capuntilfullytightened.Thedippingandremovaltechniqueminimizestheintroductionofair

bubblesintotheelectrolytesolution.Airbubblesinthe

electrolytecanaffectmeasurements.

10. Itisnormalthatexcesselectrolytesolutionwillleakfromthecapduringthisreplacement

sinceitminimizestheintroductionofairpockets.Cleanofftheexcesselectrolytebeforeuse.



1) MembraneCap

2) Cathode

3) Anode

4) DOProbe



CleaningtheDOProbe

WhentheDOreadingisunstableorincorrect,theprobeneedstobecleaned:

1. Unscrewthemembranecapfromtheprobe.

2. Placesandpaperonatablewiththecoarsesidefaceup,andaddsomewater.

3. Rubthecathodepartagainstthesandpaperabout10times.



4. Usethesandpapertocleantheanodepart.

5. Aftercleaningtheprobe,pleaserefillmembranecapwithnewelectrolyte.



WQ500 Series-en-GB_V1.3 9/15

ProbeStorage



pHprobe(WQ‐PH)

Afteruse,cleantheprobetipwithdistilledwater.Theprobetipneedstobestoredwetin

pH4buffersolution.PlacetheprotectivecapwithpH4solutionovertheendoftheprobe.





ORPprobe(67500B)

Afteruse,cleantheprobetipwithdistilledwater.Theprobetipneedstobestoredwetin

pH4buffersolutionor4.0MKCLsolution.Placetheprotectivecapwiththesolution overthe

endoftheprobe.



ConductivityProbe(WQ‐EC)

Afteruse,cleantheprobetipwithdistilledwater.Theprobeshouldbestoredwetin

deionizedordistilledwater.Placetheprotectivecapwiththewaterovertheendofthe

probe.



DissolvedOxygenprobe(WQ‐DO)

Afteruse,cleantheprobetipwithdistilledwater.



Shorttermstorage‐Lessthan2weeks

Theprobeshouldbestoredwetindeionizedordistilledwater.Placetheprotectivecapwith

thewaterovertheendoftheprobe.



Longtermstorage–morethan2weeks

The

probeshouldbestoreddry.Removethe membranecapandrinseofftheelectrodewith

deionizedordistilledwaterandthenallowtheelectrodetodry.Placethemembranecapback

overtheelectrodeforprotectionandplacetheprobetipintotheprotectivecap.



WQ500 Series-en-GB_V1.3 9/15

Specifications



 pH ORP

Range‐2.00to16.00pH‐1999to‐200mV

‐199.9to499.9mV

500to1999mV

Accuracy ±(0.02%FS+1d) ±(2%FS+1digit)

Resolution 0.01pH 0.1/1mV

Compensation ATC:0to100

C(32to212

F) N/A

 Conductivity TDS Salt

Range 0.0to199.9μS

200to1999μS

2.00to19.99mS

20.0to100.0mS

0.0to131.9ppm

132to1319ppm

1.32to13.19ppt

13.2to66.0ppt

0.0to99.9ppm

100to999ppm

1.00to9.99ppt

10.0to50.0ppt

Accuracy ±2%FS ±2%FS ±2%FS

Resolution 0.1/1μS/0.01/0.1mS 0.1/1ppm/0.01/0.1ppt 0.1/1ppm/0.01/0.1ppt

Compensation ATC:0to60

C(32to140

F) ATC:0to60

C(32to140

F) ATC:0to60

C(32to

140

F)

 DO O2 Temperature

Range 0to20.00mg/L

0to20.00ppm

0to200.0% 0to110

C(32to230

F)

Accuracy ±(0.2%FS+1digit) ±2%FS ±1

C(±1.8

F)Note:Accuracy

isratedbetween10and65

C

(50and149

Resolution 0.01mg/L 0.10% 0.1

C/F

Compensation AutomaticTemperatureCompensation(ATC):0to60

C(32to140

F)

ManualSalinityCompensation(MSC):0to50ppt

ManualAltitudeCompensation(MAC):0to7000m(20000ft.)



OperatingTemperature 0to50

C(32to122

F)

OperatingHumidity 85%maximum(non‐condensing)

Power   9Vdc,universalACadapter

Dimensions 24cm(L)x17cm(W)x5.7cm(H)or31.2cm(H)withrod

  9.5”(L)x6.7”(W)x2.2”(H)or12.3” (H)withrod

Weight   740g(1.6lbs.)



Allrightsreservedincludingtherightofreproductioninwholeorinpartinanyform

www.extech.com

Extech Instruments WQ500 User manual

Brand: Extech Instruments

Model: WQ500

Category: Measuring, testing & control

Type: User manual

This manual is also suitable for

WQ510
WQ530

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Extech Instruments WQ500 User manual

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Extech Instruments WQ500 User manual

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