wtw inoLab pH 720, Operating Manual, Page: 35 / 48

pH 720 What to do if...
35
You would like to
know which soft-
ware version is in
the instrument
Cause Remedy
pH electrode:
– pH electrode unsuitable – Use suitable electrode
– Temperature difference
between buffer and
sample too large
– Adjust temperature of
buffers or samples
– Measuring procedure not
suitable
– Follow special procedure
Cause Remedy
– Operating state
undefined or EMC
electric stress unallowed
– Processor reset:
Press the
a
key and
switch on instrument
Obviously incorrect
measured values
Instrument does not
react to keystroke
Cause Remedy
– e.g. question of the WTW
service department
– Press the
a
key and
switch on instrument.
The software version
is displayed.