Xylem Lab 850, starting from serial number 09470315 Manual de usuario descargar pdf (Pagina 56)

What to do if... Lab 850

ba75890e01 11/2009

No stable measured

value

CalClock flashes

Display,

LoBat

– 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:

– Junction contaminated – Clean junction

– 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 a suitable electrode

– Temperature too high

– Organic liquids

Cause Remedy

– Calibration interval expired – Recalibrate the measuring

system

Cause Remedy

– Batteries almost empty – Replace the batteries (see

page 53)

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Xylem Lab 850, starting from serial number 09470315 Manual de usuario Pagina 56