User manual

WQ500 Series-EU-EN V1.2 10/13

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.

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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.

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1) MembraneCap

2) Cathode

3) Anode

4) DOProbe

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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.

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

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

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