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7 Maintenance/troubleshooting
7.2
Troubleshooting
Troubleshooting must always consider all the components of the conductivity
measurement chain! The transmitter and the connecting cable must also be
tested, as well as the conductivity sensor.
The conductivity sensor can also be tested for short-circuits or internal
contact problems, see section 2 "Description", part "Measuring sensors" and
section 5.2 "Terminal assignment and wiring colors".
A continuity tester (such as the diode tester of a multimeter) is needed for this.
Error
Possible cause
Remedy
Measurement value
is too high or too low
Conductivity sensor is
dirty
Clean the conductivity
sensor
The transmitter does not
display conductivity
(e.g. display shows "0")
Broken lead or
incorrect electrical connection
Check the electrical
connection
Measuring sensor exposed to
air (not fully immersed)
Check the measuring sensor
installation location.
Is measuring material present?
Conductivity displayed
by transmitter
is too high or too low
The measuring sensor electrical
connection is incorrect:
poles are inverted or
"right - left" assignment
is incorrect
Check the electrical connection
The transmitter does not
display temperature
Broken lead or
incorrect electrical connection
Check the electrical connection
Display value unstable,
fluctuating
Malfunction caused by
incorrectly/insufficiently
shielded connecting cable
Use CR-4P cables
for connection
Malfunction caused by
gas bubbles
Check cable connection
and cable routing
Check installation location and
position of the measuring
sensor