wtw MultiLine P4 Bedienungsanleitungen Seite 55

Troubleshooting
D. O. system messages
System message
 /
Indication range
exceeded

Inadmissible
calibration

Damaged
membrane
Other possible errors - D. O. measurement
System message
Measured value
too low
Measured value
too high
Cause
Short circuit between gold
and lead electrode
œ Electrolyte solution used up
œ Membrane contaminated
œ Electrode system poisoned
œ Membrane damaged
œ Membrane head not
tightened properly
Cause
Insufficient flow
œ High share of solutes
œ Air bubbles bump on
membrane with high velocity
œ The carbon dioxide pressure
is too high > 1 Bar
Action
Check probe,
if necessary exchange
Regenerate probe
Clean membrane
Regenerate probe
Regenerate probe
Tighten membrane head
Action
Provide flow
Correct solubility function by
entering the salinity equivalent
Flow should not meet
membrane directly
No measurement possible
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