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83
10 Eliminating faults and malfunctions
10.1 Possible faults
t
Problem
Possible cause
Measures
No measurement display
or
current output
Supply voltage
missing
Check supply voltage,
also check terminals
Measurement display
000 or
analog output 0/4 mA
or 0 V
Sensor not immersed in
medium; reservoir level
too low
Top up the reservoir
Flow-through fitting
is blocked
Clean flow-through
fitting
Sensor is faulty
Replace the sensor
Wrong or
unstable
measurement display
Sensor not immersed
deeply enough
Top up the reservoir
Inadequate mixing
Ensure good mixing;
for sensor: all-round
free space of approx.
5 mm to ensure all-round
flow
Air bubbles
Check mounting site
Measurement display
8888,
Temperature display
“ok”, blinking
Overrange / underrange
or faulty sensor
Check the basic settings.
Check the electrical
connection for the
sensor.
Replace the instrument.
Measurement display
8888,
temperature display
8888, blinking
Infringement of
temperature range (over/
underrange), or short-
circuit or cable break for
the temperature sensor
The temperature for the
measured medium is
outside the permissible
range for temperature
compensation.
Replace the instrument.
Replace the sensor.
Temperature display and
measurement display are
normal,
but the unit indicates
????
The basic settings were
configured on the
instrument in the
“Customized” mode.
“Unit” must be
configured through the
setup program, or
the “Customized” mode
must be abandoned.
Fluctuating
measurement display
Symmetrical
connection was chosen.
- Interruption of
connection to
liquid potential.
- Interference potential
too high.
- Check the electrical
connection, see
Chapter 4.5 “Terminal
assignments”, page
19
- Eliminate interference
potential.
All manuals and user guides at all-guides.com
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