Instruction Manual

handylab pH 11 What to do if...
39
ba75366e04 01/2011
Obviously incor-
rect
measured values
Instrument does
not react to key-
stroke
Display to
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