wtw pHotoFlex pH, Быстрый старт

Страница: 20 / 26

Operation pHotoFlex
®
pH
20 ba75977e03 10/2017
No stable measured
value
Obviously incorrect
measured values
– Not enough electrolyte – Top up electrolyte
– Electrode obsolete – Replace electrode
– Electrode broken – Replace electrode
– Socket damp – Dry socket
Calibration procedure:
– Incorrect solution temperature
(without temperature sensor)
– Set up correct temperature
– Incorrect buffer solutions – Select buffer solutions
suitable for the calibration
procedure
– Buffer solutions too old – Use only once.
Note the shelf life
Cause Remedy
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
Ele test sample:
– Conductivity too low
(e.g. in ultrapure water)
– Use suitable electrode
– Temperature too high – Use suitable electrode
– Organic liquids – Use suitable electrode
Cause Remedy
pH electrode:
– Not connected – Connect electrode