wtw 330i Operating Manual page 55

pH 330i/340i
Obviously incorrect
measured values
Instrument does not
react to keystroke
Display
Probe symbol flashes
Message StoFull StoFull
StoFull StoFull
Cause
pH electrode:
– pH electrode unsuitable
– Temperature difference
between buffer and test
sample too high
– Measurement procedure not
suitable
Cause
– Operating condition
undefined or EMC load
unallowed
to to
to to
Cause
– Time-out of the interface
Cause
– Calibration interval expired
Cause
– All memory locations are full
Remedy
– Use suitable electrode
– Adjust temperature of buffers
or test samples
– Follow special procedure
Remedy
– Processor reset:
Press the <CAL> and
<ON/OFF> keys at the same
time and release them again.
The software version is
displayed.
Remedy
– Check the instrument that is
connected
Remedy
– Recalibrate the measuring
system
Remedy
– Output data storage and clear
data storage
What to do if...
55