Metrohm viva 1.0 (process analysis) - Manual (Page 966)

9.3 Frequently asked questions
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954 ￭￭￭￭￭￭￭￭
viva 1.0 (for Process analysis)
Problem Cause Remedy
The tubing connections are
leaking. Check the tubing connections and tighten, if
necessary.
The rinse and/or waste
canister is sealed air-tight. Loosen the lids on the canisters a little or
remove them.
The pump time of
the peristaltic pump
increases. The pump tubing of the
peristaltic pump has aged
or is defective. Replace the pump tubing.
The sample is not
completely transfer-
red from the Sample
Processor to the
measuring vessel via
the peristaltic pump. The PEEK needle on the
Sample Processor is posi-
tioned more than 0.5 mm
from the floor of the sam-
ple vial. Position the PEEK needle in accordance with
the instructions in the Manual 894 Profes-
sional CVS.
The contact pressure set
for the tubing cartridge is
insufficient. Set the contact pressure of the tubing car-
tridge in accordance with the Sample Pro-
cessor manual.
9.3 Frequently asked questions
Question Answer
How often should the dos-
ing units be prepared? The dosing units used must be prepared
at least once a day before measurement
begins. This ensures that fresh solution is
used for the analysis.
What preparatory steps
need to be taken before
shutting down the measur-
ing system? All dosing units used should be rinsed
with distilled water in order to prevent a
possible crystallization of metal salts.
At what intervals should a
dosing unit be cleaned? The dosing units used for CVS should be
disassembled and thoroughly cleaned at
14-day intervals.
How often should mainte-
nance procedures be per-
formed on the reference
electrode? The reference electrolyte must be
replaced daily. The bridge electrolyte
should be replaced every other day. The
multimedia guide "Electrodes in Voltam-
metry" contains a comprehensive video
tutorial on this topic.