Metrohm 940 Professional IC Vario TWO/SeS/PP - Manual (Page 102)

6.1
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94 ￭￭￭￭￭￭￭￭
940 Professional IC Vario TWO/SeS (2.940.2400)
Problem Cause Remedy
Note: 6.2821.180 pump tubing connection
with filter must be used.
Guard column – Blocked. Replace the guard column (see Chapter 3.20,
page 49).
Separation column –
Blocked. ￭ Regenerate the separation column (see
Chapter 5.16.4, page 91).
￭ Replace the separation column (see "Con-
necting the separation column", page 53).
Note: Samples should always be microfiltered .
Injection valve – Valve
blocked. Have the valve cleaned (by a Metrohm service
technician).
The retention times
in the chromato-
gram have changed
unexpectedly. Separation column –
Diminished separating effi-
ciency. ￭ Regenerate the separation column (see
Chapter 5.16.4, page 91).
￭ Replace the separation column (see "Con-
necting the separation column", page 53).
The eluent contains gas
bubbles. ￭ Ensure that the connectors for the eluent
degasser are firmly connected .
￭ 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 fix 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 89).
Sample – There are gas
bubbles in the sample. Use the sample degasser .
MCS – The CO
2
suppressor
is not connected.
Connect the CO
2
suppressor.
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 is defective. 1. Save column configuration in MagIC Net™.
2. Notify Metrohm Service.