￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭
7 Troubleshooting
￭￭￭￭￭￭￭￭
53
Problem
Cause
Remedy
note that with
Potential step / Sweep rate < 20 ms
or
Potential step
·
Frequency < 20 ms
the use
of a fixed current range is recommended.
The electrode is not con-
nected properly.
Verify that the electrode is plugged in correctly.
Electrical contacts in the
SPE holder corroded.
If liquid has penetrated the SPE holder too
often, the electrical contacts in the connection
socket for the SPE can corrode. Contact your
local Metrohm Service for the replacement of
the SPE holder.
Electromagnetic radiation
interferes.
Other electronic equipment in the vicinity of
the instrument may emit electromagnetic radi-
ation which interferes with the measurement.
Known sources of interference are e.g. AC
adapters for laptops, power supply units for
fluorescent lamps, high-frequency vacuum
pumps.
In such a case, remove the source of interfer-
ence or carry out the determination in a differ-
ent location or consider the use of a Faraday
cage which is connected to earth or ground.
Curve shape - the
curves show an
unusual shape
The electrode surface was
touched during assembly
of the SPE.
Always hold the SPE at the edges in order to
avoid contact with the electrode surface.
Solution penetrated the
SPE holder and short-cir-
cuits the electrodes in the
connection socket.
Disassemble the electrode holder. To remove
corrosive chemicals, rinse everything with
ultrapure water. Then thoroughly dry all parts.
Take care that no water runs along the outside
of the electrode shaft into the measuring
head. Then thoroughly dry all parts. If the elec-
trode connection socket is rinsed too, the shaft
has to dry for a couple of hours before reas-
sembling to ensure that no moisture is cap-
tured in the holder.
No peak - neither
the sample nor the
standard addition
shows a peak for
the analyte.
Incorrect or not sufficient
electrolyte.
Check whether the correct and enough elec-
trolyte was added for the application. Verify
that the used electrolyte was prepared cor-
rectly.
Summary of Contents for 2.946.0010
Page 1: ...946 Portable VA Analyzer 2 946 00x0 Manual 8 946 8003EN ...
Page 2: ......
Page 8: ......
Page 12: ...1 4 Symbols and conventions 4 Note This symbol marks additional information and tips ...
Page 79: ... 8 Technical specifications 71 8 8 Connection Connection USB version 1 1 or higher ...
