6 Rectifying faults and malfunctions
Problem Possible cause Measure
No display of measured value
or signal output
No power supply Check power supply, check
terminals
Display of measured value is
000 or signal output is 0% (e.g.
4 mA)
Sensor not immersed in the
medium; storage tank level too
low
Top up storage tank
Flow fitting blocked Clean flow fitting
Sensor faulty
Incorrect or fluctuating meas‐
ured value display
Sensor not immersed deeply
enough
Top up storage tank
No mixing Ensure that the sample is
mixed well, ensuring that there
is approx. 18 mm of free circu‐
lation on all sides of the sensor
Air bubbles Refer to the installation instruc‐
tions
Rectifying faults and malfunctions
27
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