wtw pH 526 Bedienungsanleitungen Seite 39

Trouble Shooting
No message
Indication range
exceeded
No message
Wrong measured
values
Instrument doesn't
react upon key
operation
to to
Electrode:
•
Diaphragm contaminated
•
Membrane contaminated
Sample solution:
•
ph value not stable
•
Temperature not stable
Electrode +sample solution:
•
Too low conductivity
•
High temperature
Organic liquids
Electrode:
•
Improper electrode
•
Temperature difference
between calibration and
sample solution too high
•
Interference voltages
•
Improper measuring
procedure
Undefined operation
condition of the processor e.g.
after non-admissible ESD
admission
Timeout of the serial interface
(pH 538 only)
Electrode:
Clean diaphragm
Clean membrane
Sample solution:
Possibly temper
Possibly temper
Use suitable electrode
Use suitable electrode
Use suitable electrode
Electrode:
Select suitable electrode
Temper buffer or sample
solutions
Do not connect PC or printer if
sample solution is grounded
Attend to special procedures
Press key RCL and switch on
the instrument
Check connected instrument
39