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COM 381
D. O. system messages
System message
Cause
Short circuit between gold
0FL
and lead electrode
Indication range
exceeded
• Electrolyte solution used up
E3
• Membrane contaminated
Inadmissible
• Electrode system poisoned
calibration
• Membrane damaged
E7
• Membrane head not
Damaged
tightened properly
membrane
Other possible errors - D. O. measurement
System message
Cause
Measured value
Insufficient flow
too low
• High share of solutes
Measured value
too high
• Air bubbles bump on
membrane with high velocity
• The carbon dioxide pressure
is too high > 1 Bar
38
Troubleshooting
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
Endress+Hauser
Troubleshooting
General system messages
System message
Cause
Meter does not
Undefined operation state
react on
of the processor, e. g.
keypressing
after inadmissible EMC
admission (outside the
specified ranges)
Batteries nearly discharged.
LoBat
Timeout of serial interface.
to
Set calibration interval has
is flashing
run out.
Endress+Hauser
COM 381
Action
Reset of processor:
Press RCL key and
switch meter on.
Charge rechargeable batteries/
Change non-rechargeable
batteries
Check connected
instrument.
Recalibrate probe.
39
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