Xylem MULTI 3400 MULTI-PARAMETER METERS Manual do Utilizador descarregar pdf (Página 66)

What to do if... Multi 3400i

No stable measured

value

Obviously incorrect

measured values

Buffer solutions

– Incorrect buffer solutions – Change calibration procedure

– Buffer solutions too old – Use only once.

Note the shelf life

– Buffer solutions depleted – Change solutions

Cause Remedy

pH electrode:

– Diaphragm contaminated – Clean diaphragm

– Membrane contaminated – Clean membrane

Test sample:

– pH value not stable – Measure with air excluded if

necessary

– Temperature not stable – Adjust temperature 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 high

– Adjust temperature of buffers

or sample

– Measurement procedure not

suitable

– Follow special procedure

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Xylem MULTI 3400 MULTI-PARAMETER METERS Manual do Utilizador Página 66