Metrohm viva 1.1 (ProLab) - Manual (Page 1053)

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9 Support
viva 1.1 (for process analysis)
￭￭￭￭￭￭￭￭ 1041
Problem Cause Remedy
Solution is leaking
between the mea-
suring instrument
and the measuring
head. The measuring head is not
correctly locked in place on
the measuring head arm. Let the measuring head snap into place. The
click must be audible.
The sealing rings have
aged or are defective. Contact the Metrohm Service department.
The electrode test
fails. One or several electrodes
are not connected. Check the electrode cable connections.
One or several electrodes
are defective. Perform maintenance in accordance with the
electrode leaflet.
The measuring vessel con-
tains too little solution or is
empty. Check the fill level in the measuring vessel and
add solution if necessary.
The electrode tip of
the working elec-
trode and/or the
auxiliary electrode
shows copper
deposits. An incorrect potential has
been applied because the
reference electrode is
defective. ￭ Check the reference electrode; perform
maintenance procedure in accordance with
the electrode leaflet, if necessary.
￭ Dip the electrode tip of the working elec-
trode and/or the auxiliary electrode into
concentrated nitric acid for 1 to 2 seconds
and then thoroughly rinse with distilled
water.
An incorrect potential was
applied because the refer-
ence electrode is not con-
nected. ￭ Check the electrode connectors.
￭ Dip the electrode tip of the working elec-
trode and/or the auxiliary electrode into
concentrated nitric acid for 1 to 2 seconds
and then thoroughly rinse with distilled
water.
An incorrect potential was
applied because the mea-
suring vessel contains too
little measuring solution. ￭ All three electrodes must be immersed in
the measuring solution.
￭ Dip the electrode tip of the working elec-
trode and/or the auxiliary electrode into
concentrated nitric acid for 1 to 2 seconds
and then thoroughly rinse with distilled
water.
The measured val-
ues are widely scat-
tered. The solutions are pipetted
manually. Use an 800 Dosino with dosing unit.
The solutions are not
added via the pipetting
opening. Add solutions only via the pipetting opening
(see Manual 894 Professional CVS).