Hach EZ Serie Manuel De L'utilisateur page 36

Error/Warning message
Analysis results are unstable
E-stop/ Reinitialize the
dispenser!
Sensor pH/mV error
Titration error
36 English
Possible cause
Micropump is defective
Peristaltic pump is defective
Valve is defective
Stirrer is defective
Dispenser is defective
The position of tubes in the
analysis vessel is not correct
The reagents have expired.
When Emergency stop is
pushed, the dispenser stops
and must be started again.
The pH or mV electrode are
defective or not connected.
The titration did not measure
an EP or the maximum amount
of titration solution was added
without getting an endpoint pH
or mV.
Solution
Make sure the reagents are
dosed correctly and there is no
air in the tubing.
Make sure that the drain and
sample pump are operating
correctly.
Make sure that the valves
(sample, REF1, REF2, clean)
are operating correctly.
Examine if there is a magnetic
stirrer bar in the analysis vessel
and if the solution is stirred
during analysis.
Make sure that the dispenser
piston is filled with liquid and
that there is no air in the tubing.
Examine the position of the
tubing in the analysis vessel.
Make sure that the drain tubing
is at the back side of the
analysis vessel and in the
ringlets. Other tubing should be
above the liquid level.
Prepare a new set of reagents
when the reagent bottles are
empty. Flush/Prime all tubing
before a measurement is
started.
Examine the dispenser. Push
F2 > Dispenser to start the
dispenser again.
Examine if the electrode is
connected correctly. Examine
the electrolyte level in the
electrode, refill if necessary.
• Examine if sample solution
goes into the vessel.
• Examine if the dispenser is
filled.
• Make sure that the sensing
part of the electrode is fully
in the sample.
• Make sure that the electrode
is filled with electrolyte
solution.
• Examine the level of
reagents and titrant solution.
Fill if necessary.