Xylem inoLab 7310_7310P WASTEWATER pH METER User Manual

Page 60

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What to do if...

pH 7310

60

ba75929e03

12/2011

No stable measured

value

Obviously incorrect

measured values

Cause

Remedy

pH electrode:

– Junction contaminated

– Clean junction

– Membrane contaminated

– Clean membrane

Test sample:

– pH value not stable

– Measure with air excluded if

necessary

– Temperature not stable

– Temper if necessary

Electrode + test sample:

– Conductivity too low

– Use suitable electrode

– Temperature too high

– Use suitable electrode

– Organic liquids

– Use suitable electrode

Cause

Remedy

pH electrode:

– pH electrode unsuitable

– Use suitable electrode

– Temperature difference between

buffer and test sample too great

– Adjust temperature of buffer or

sample solutions

– Measurement procedure not suit-

able

– Follow special procedure

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