5.1
￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭
90
￭￭￭￭￭￭￭￭
883 Basic IC plus
Problem Cause Remedy
The conductivity detector is
blocked.
￭ Shorten the capillary ends by a few millime-
ters .
￭ Rinse the detector opposite the normal
flow direction .
Guard column – Blocked. Replace the guard column (see chapter 3.19,
page 49).
Separation column –
Blocked.
￭ Regenerate the separation column (see
chapter 4.14.4, page 88).
￭ Replace the separation column (see "Con-
necting the separation column", page 53).
Note: Samples should always be microfiltered .
Injection valve – blocked. Have the valve cleaned (by a Metrohm service
engineer).
The retention times
in the chromato-
gram have changed
unexpectedly.
Eluent - Incorrect concen-
tration
Create eluent with correct concentration.
Separation column –
Diminished separating effi-
ciency.
￭ Regenerate the separation column (see
chapter 4.14.4, page 88).
￭ Replace the separation column (see "Con-
necting the separation column", page 53).
The eluent contains gas
bubbles.
￭ Deaerate the high-pressure pump (see fig-
ure , page 48).
High-pressure pump –
Defective.
Request Metrohm Service.
Peak areas are lower
than expected.
Sample – There is a leak in
the sample path.
Find and fix the leak in the sample path.
Sample – The sample path
is blocked.
Find and eliminate the blockage in the sample
path.
Sample – The sample loop
is not (completely) filled.
Adjust the transfer time for the sample (see
"Determining the transfer time", page 86).
The peristaltic pump
is pumping too little.
Peristaltic pump – Contact
pressure too weak.
Correctly set the contact pressure (see "Setting
the contact pressure correctly", page 41).
Peristaltic pump – Filter
blocked.
Replace the filter (see "Replacing the filter",
page 85).
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