Metrohm 850 Professional IC MSM-HC MCS Prep 3 - Manual (Page 129)

￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭
6 Troubleshooting
850 Professional IC Anion – MSM-HC – MCS – Prep 3
￭￭￭￭￭￭￭￭ 119
Problem Cause Remedy
￭ Replace separation column (see "Connect-
ing and rinsing the separation column",
page 75).
Conductivity detec-
tor is not recognized
in the software No connection.
￭ Check the cable connection (41- 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 3.5, page
19) (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 3.22,
page 72).
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 75).
Greater rise in the
baseline SPM – reduced capacity. Regenerate the SPM (see Chapter 5.10.3.1,
page 98).
MSM-HC – reduced
capacity. Regenerate the MSM-HC (see Chapter
5.13.3.1, page 107).
Precision problems -
significant scatter-
ing of the measured
values Sample – Gas bubbles in
the sample. Use sample degasser (see Chapter 3.13, page
45).
Injection valve – sample
loop. Check installation of the sample loop (see
Chapter 3.16.1, page 57).
Sample – Rinsing volume
too low. Prolong the rinsing time (see Chapter 5.8,
page 95).
Injection valve – defective. Request Metrohm Service.
MCS – vacuum too low. ￭ Check connectors. If they are ok:
￭ Contact the Metrohm Service.