Transmitter 9135 – pH/redox measurement
Page 59
6. Failures detection and error messages
Failures detection
Symptom Possible
cause
Remedy
Reading out of
scale
Faulty
transmitter
Check the transmitter by connecting a
pH simulator or a voltage generator
instead of the electrode
Faulty
electrode
Check the electrode operation with
buffer solutions
Electrode not
correctly
connected
Check the connections
Bubbles in the
bulb
Remove the electrode, shake it and put
it back
Unstable display Faulty
transmitter
Check the transmitter by connecting a
pH simulator or a voltage generator
instead of the electrode
solution not
earth grounded
Connect the electrode
Bubbles on the
pH bulb
Remove the electrode, shake it and put
it back
Slow drift
PH bulb
polluted
See cleaning instructions
Reference
clogged
See cleaning instructions
Low slope or
slow response
Buffers
polluted
Use new buffers
PH bulb
polluted
See cleaning instructions
Reference
clogged
See cleaning instructions
Faulty
electrode
Check the electrode operation
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