Metrohm 940 Professional IC Vario ONE/ChS/LPG - Manual (Page 101)

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6 Troubleshooting
940 Professional IC Vario ONE/ChS/LPG (2.940.1250)
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Problem Cause Remedy
Separation column –
Blocked. ￭ Regenerate the separation column (see
Chapter 5.15.4, page 90).
￭ 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 5.15.4, page 90).
￭ 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 88).
Sample – There are gas
bubbles in the sample. Use the sample degasser .
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.
Individual peaks are
greater than
expected. Sample – Sample carry-
over from the previous
measurement. Check the rinsing time (see "Checking the rins-
ing time", page 89).
Suppressor – Insuffi-
cient flow of regen-
eration solution or
rinsing solution. There is a leak in the sys-
tem. Check all connections.