24
Troubleshooting
KNAUER
Degasser 20DG User Manual V7632A, Version 1.1
Troubleshooting
First measures for troubleshooting:
Check all screw fittings
Check whether air has gotten into the supply lines
Check device for leaks
Further measures:
Check errors against error list
Contact the Technical Support hotline of the manufacturer
Error List and Solutions
Problem
Cause
Solution
The device is on, but all
3 LEDs are off and the
device is not energized.
Fuse blown
Defective power supply
Contact the service depart-
ment.
The INIT LED is lit con-
stantly and the pump is
audibly running at high
speed
Pump is busy with the
starting process or the
degassing capacity has
to be increased.
Normal procedure. If this
process takes a long time, it
could be an indication that
there is an error in the sys-
tem.
INIT LED flashes at 1s inter-
vals and the vacuum pump
is running.
Possibly the micropro-
cessor or monitoring sys-
tem has a malfunction.
Contact the service depart-
ment.
Is it possible to check
whether the degasser is
working properly when the
POWER and READY LEDs
are lit, but the pump is not
audibly running?
At low rotational speeds,
the pump can hardly be
heard, although the vac-
uum is good and the
degassing process is tak-
ing place.
Compare the baseline of
non-degassed methanol at
251 nm with the baseline
of degassed methanol. If
the degasser is working
properly, the baseline of
the non-degassed metha-
nol should have signifi-
cantly higher noise.
Air bubbles occur in the
solvent tubes of the degas-
ser outlet.
Loose or damaged screw
fittings
Check the inlet and outlet
fittings. Replace old fittings,
if necessary.
No solvent flow
Air in the pump head
Flush the pump head.
If buffer solution is left in
the degasser for an
extended period, it can
cause clogging in the
degasser.
Use another degasser
chamber. Carefully let
water flow into the clogged
degasser chamber to dis-
solve the buffer. If this does
not help, contact the ser-
vice department.
