Metrohm 887 Professional UV/VIS Detector - Manual (Page 44)

7.1 Problems and their solutions ￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭
36 ￭￭￭￭￭￭￭￭ 887 Professional UV/VIS Detector
7 Troubleshooting
7.1 Problems and their solutions
Problem Cause Remedy
Marked drop in
pressure Leak in the system. Check all capillary connections and seal leaks,
if necessary (see Chapter 3.4, page 15).
Drift of the baseline Leak in flow-through cell. Check connections and seal leak if necessary.
Thermal equilibrium not yet
attained. Wait until constant temperature is reached in
the system.
Leak in the system. Check all capillary connections and seal leaks,
if necessary (see Chapter 3.4, page 15).
Very noisy baseline Flow-through cell – lens
deposits. Cleaning the flow-through cell (see Chapter
6.6, page 31).
Flow-through cell – air
bubbles. ￭ Cleaning the flow-through cell (see Chap-
ter 6.6, page 31).
￭ Ensure that the PEEK capillary (6.1831.100)
is connected to the cell outlet.
￭ Use eluent degasser.
UV lamp – radiation too
weak. Replace UV lamp (see Chapter 6.3, page 27).
Eluent – absorption too
strong. Change the eluent.
Wavelength inappropriate. Change wavelength setting in MagIC Net.
No measuring signal Lamp not burning. Replace UV lamp (see Chapter 6.3, page 27).
Extreme spread of
the peaks in the
chromatogram.
Splitting (dual
peaks) Capillary connections –
dead volume in the system. Check connections (see Chapter 3.4, page 15)
(use PEEK capillaries with an internal diameter
of 0.25 mm between the injection valve and
detector).
Lamp does not
ignite. Lamp defective. Replace UV lamp (see Chapter 6.3, page 27).