Metrohm 2.850.2230, Руководство пользователя, Страница: 121 / 150

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6 Troubleshooting
850 Professional IC–Anion – MSM-HC – MCS – LP Gradient
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111
Problem Cause Remedy
￭
Replace separation column (see "Connect-
ing and rinsing the separation column",
page 73)
.
Conductivity detec-
tor is not recognized
in the software
No connection.
￭
Check the cable connection (38-
1
) .
￭
Turn the instrument off and on again (after
15 seconds).
Extreme spread of
the peaks in the
chromatogram.
Splitting (dual
peaks) Connections – dead vol-
ume in the system. Check the connections (see Chapter 3.6, page
20) (use PEEK capillaries with an internal diam-
eter of 0.25 mm between the injection valve
and detector).
Guard column – diminished
performance.
￭
Replace guard column (see Chapter 3.23,
page 70) .
Separation column – dead
volume at column head.
￭
Install separation column in reverse flow
direction (if permitted by the information
sheet).
￭
Replace separation column (see "Connect-
ing and rinsing the separation column",
page 73)
.
Greater rise in the
baseline MSM-HC – reduced
capacity. Regenerate the MSM-HC (see Chapter
5.11.3.1, page 96) .
Precision problems -
significant scatter-
ing of the measured
values Sample – Gas bubbles in
the sample. Use sample degasser (see Chapter 3.15, page
48) .
Injection valve – sample
loop. Check installation of the sample loop (see
Chapter 3.16.1, page 50) .
Sample – Rinsing volume
too low. Prolong the rinsing time (see Chapter 5.8,
page 93) .
Injection valve – defective. Request Metrohm Service.
MCS – vacuum too low.
￭
Check connectors. If they are ok:
￭
Contact the Metrohm Service.
Unexpected change
to the retention
times in the chroma-
tograms Separation column –
diminished separating effi-
ciency.
￭
Regenerate separation column (see Chap-
ter 5.15.4, page 106) .
￭
Replace separation column (see "Connect-
ing and rinsing the separation column",
page 73)
.