Extech Instruments 341350A Manual

Open as PDF

next previous

341350A-EN V1.2 1/14

pHTroubleshootingChart

Symptom Cause RecommendedSolution

Longresponse

timeorreading

drift

CloggedJunction Soakin4.07MKCL@60

C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

tapwaterasthestoragemedium.

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.