Extech Instruments PH210 Manual

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PH210-en-GB_v1.3 11/14

TroubleshootinganElectrode

Symptom Cause Recommendation

Longresponsetimeor

readingdrift

CloggedJunction Soakin4.07MPotassiumChloride(KCl)

@60

Cfor30minutes.

StrongAlkaline

measurement

Soakin0.1MHCLovernight.

DeterioratedGellayer Replaceelectrode.

Proteincoatingonelectrode

surface

Soakin1gmPepsindissolvedin100ml

of0.1mHCLfor30minutesoras

needed.

Oil,paint,dyes,suspended

solidsetc.areonsensor

Rinseelectrodealternatelywitha

materialssolventandabuffer7.00.

Organicsolventsarecoating

thesensor

Organicmolefractionhastobeless

than50%toassurereasonablereadings.

Limittimeofmeasurement.Keepprobe

inthe7.0bufferbetweenreadings.

Dehydratedmembrane Readsolutionfordrybulbbelow:

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.Wetting

capwillprotectbulbbetweentests.

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usinginertKCl).



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