Metrohm 881 Compact IC pro – Cation User Manual
Page 79
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6 Troubleshooting
881 Compact IC pro – Cation
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71
Problem
Cause
Remedy
Very noisy baseline
High pressure pump – con-
taminated pump valves.
Clean pump valves (see Chapter 5.5.2, page
54).
Eluent – Leak in the eluent
path.
Check the eluent path
Eluent – Blockage in the
eluent path.
Check the eluent path
High pressure pump –
defective piston seals.
Replace (see Chapter 5.5.2, page 54) piston
seals .
Pulsation absorber not
connected. or defective.
Connect pulsation absorber (see Chapter 3.12,
page 33). or replace it.
Background conduc-
tivity too high
Incorrect eluent.
Change eluent (see Chapter 5.4.2.3, page 53).
Data of the separa-
tion column cannot
be read.
Column chip contamina-
ted.
Clean the contact surfaces of the column chip
(with alcohol).
Column chip defective.
1. Save column configuration in MagIC Net™.
2. Notify Metrohm Service.
Individual peaks
greater than expec-
ted
Sample – carry-over of the
samples from previous
measurement.
Rinse system longer between two samples.
Poor reproducibility
of the retention
times
Eluent – Leak in the eluent
path.
Check the eluent path
Eluent – Blockage in the
eluent path.
Check the eluent path
Chromatograms
have poor resolution
Separation column –
diminished separating effi-
ciency.
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Regenerate separation column (see Chap-
ter 5.10.4, page 69).
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Replace separation column (see "Connect-
ing and rinsing the separation column",
page 45).
Extreme spread of
the peaks in the
chromatogram.
Splitting (dual
peaks)
Capillary connections –
dead volume in the system.
Check connections (see Chapter 3.5, page 14)
(use PEEK capillaries with an internal diameter
of 0.25 mm between the injection valve and
detector).
Guard column – diminished
performance.
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