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Error symptom
Instrument displays
0.0 mg/l or 0 % Sat O 2
(sensor in air)
Sensor cannot be calibrated
Sensor cannot be calibrated
even after exchange of
electrolyte and membrane
head
Leakage is displayed
Wrong temp. indication
Mechanical damage of the
sensor
Instrument displays OFL
24
Possible errors
Possible cause
•
No connection
between meter and
sensor
•
Defective cable
•
Contaminated
exchange cartridge
•
Contaminated
electrode resp.
sensor poisoned
•
Membrane head
hasn't been really
tightned
•
Hole in the
membrane
•
Defective
temperature sensor
•
Display range
exceeded
•
Short circuit between
gold cathode and
lead anode
Elimination
Control connection
between meter and
sensor
Send sensor to WTW
Refill sensor acc. to
operation manual, wait
60 min. and recalibrate
Cleaning of electrode
Screw tight membrane
head
Exchange membrane
head acc. to operation
manual
Send sensor to WTW
Send sensor to WTW
Regenerate sensor;
if meter still displays
OFL send sensor to
WTW
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