Xylem ProLab 3000 Manual do Utilizador descarregar pdf (Página 174)

What to do if... ProLab 3000

174

ba75645e03 12/2012

No stable measured

value

Obviously incorrect

measured values

– Electrode broken – Replace the electrode

Buffer solutions:

– Incorrect buffer solutions – Select the suitable buffer set

for the buffers used

– Replace the buffer solutions

– Buffer solutions too old – Use only once.

Note the shelf life

– Buffer solutions depleted – Replace the buffer 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 neces-

sary

Electrode + test sample:

– Conductivity too low – Use a suitable electrode

– Temperature too high – Use a suitable electrode

– Organic liquids – Use a suitable electrode

Cause Remedy

pH electrode:

– Not connected – Connect the electrode

– Cable broken – Replace the electrode

– pH electrode unsuitable – Use a suitable electrode

– Temperature difference

between buffer and test sam-

ple too high

– Adjust temperature of buffer

or sample solutions

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Xylem ProLab 3000 Manual do Utilizador Página 174