417101733_Ecotrans.doc
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Rev. 2-03.10
9.
Malfunctions
Fault
Possible cause
Troubleshooting advice
pH 7 still shown on the display
despite the amended pH value
Short circuit in the electrode
lead or humidity circuit in the
plug-and-socket connectors
Check the electrode cable in the
connector region; check the plug for
moisture; replace the cable if
necessary
pH2 or pH 12 constantly shown
on the display
Connecting lead between the
measuring cell and the
measuring amplifier interrupted
Check the connecting lead and
replace if necessary
Great measurement fluctuations
Air in the measuring water,
faults in the measuring line
Check the measuring environment for
air inlets; check the measuring lead
sheath
The display cannot be set to the
buffer solution value during
calibration
Measuring chain old or
extremely dirty
Clean or, if necessary, replace the
measuring chain
Implausible measurement
The buffer solution using
during calibration was incorrect
or too old
Recalibrate using the right buffer
solution
Measurement changes if the
medium is flowing
Inflow velocity too high
Conduct a measurement in the
bypass and reduce the inflow
