Metrohm 894 Professional CVS - Manual (Page 93)

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7 Troubleshooting
894 Professional CVS
￭￭￭￭￭￭￭￭ 83
Problem Cause Remedy
replace the reference electrolyte every other
day and the bridge electrolyte every day.
The measuring vessel and
the electrodes have been
contaminated with organic
additives. Thoroughly rinse the measuring vessel and the
electrodes and use fresh VMS.
The measuring ves-
sel overflows. Incorrect pump times have
been defined in viva. Adjust the pump times.
The volumes defined in the
dosing commands in viva
are too large. Reduce the volumes.
The peak is no lon-
ger recognized. The reference potential has
shifted. Perform maintenance procedure for the refer-
ence electrode in accordance with the elec-
trode leaflet.
The signal does not
decrease in spite of
suppressor addition. No chloride is contained in
the Cu VMS. Check the preparation of the Cu VMS and
modify it if required.
7.2 Peripheral devices
Problem Cause Remedy
The 800 Dosino can-
not be actuated by
the 894 Professional
CVS. The connection between
the 800 Dosino and the
894 Professional CVS is
either interrupted or an
error has occurred on the
800 Dosino. ￭ Check the cable connections.
￭ Disconnect the 894 Professional CVS from
the power supply and connect it again.
￭ Check the dosing and filling rate.
￭ Contact the Metrohm Service department if
necessary.
The data of the dos-
ing unit cannot be
read. The data chip of the dosing
unit is mechanically dam-
aged or impaired by chem-
icals. ￭ Remove the dosing drive and attach it
again.
￭ Clean the data chip and the contact sur-
faces.
￭ Have the data chip replaced by the
Metrohm Service department.
The dosing unit is
blocked and/or leak-
ing. Crystals have formed (in
the dosing cylinder, on the
valve disk or in the capil-
lary). ￭ Check the flow path.
￭ Rinse the dosing unit and the connected
tubings and capillaries (Prepare function)
when the measuring system is not in use.