wtw 330i - Page 55

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