Metrohm 930 Compact IC Flex ChS - Manual (Page 91)

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6 Troubleshooting
930 Compact IC Flex ChS (2.930.1200)
￭￭￭￭￭￭￭￭ 83
Problem Cause Remedy
The incorrect eluent is
being used. Change the eluent (see Chapter 5.4.2, page
51).
Suppressor – No or insuffi-
cient flow of regeneration
solution or rinsing solution. Check the flow of the regeneration solution
and the rinsing solution .
The retention times
are poorly reprodu-
cible. The eluent path has a leak. Check all of the connections along the eluent
path and fix the leak.
The eluent path is blocked. Check the eluent path and fix the blockage.
The eluent contains gas
bubbles. ￭ Inspect the connectors for the eluent
degasser .
￭ Deaerate the high-pressure pump (see
Chapter 3.14, page 38).
Baseline increasing
strongly. Suppressor – Reduced
capacity. Regenerate the suppressor (see Chapter
5.10.3.2, page 71).
SPM – Reduced capacity. Regenerate the SPM (see Chapter 5.10.3.2,
page 71).
Chromatograms
have poor resolution Separation column –
Diminished separating effi-
ciency. ￭ Regenerate the separation column (see
Chapter 5.13.4, page 79).
￭ Replace the separation column (see "Con-
necting the separation column", page 44).
Extreme spread of
the peaks in the
chromatogram.
Splitting (dual
peaks) Capillary connections –
dead volume in the system. Check the capillary connections (see Chapter
3.2, page 12) (use PEEK capillaries with an
inner diameter of 0.25 mm between the injec-
tion valve and detector).
Guard column – Dimin-
ished efficiency. ￭ Replace the guard column (see Chapter
3.15, page 40).
Separation column – Dead
volume at the column
head. ￭ Install the separation column in the oppo-
site flow direction (if permitted by the leaf-
let) and rinse into a beaker.
￭ Replace the separation column (see "Con-
necting the separation column", page 44).
Precision problems -
the measured values
are highly scattered. Injection valve – Sample
loop. Inspect the installation of the sample loop (see
"Optional: Exchanging the sample loop",
page 25).