Büchi Labortechnik AG
Help with faults | 8
Operation Manual Pure Chromatography Instruments
83/102
Malfunction
Possible cause
Solution
Noisy ELSD baseline Dirty or contaminated gas
u
Replace gas source.
u
Replace filter.
Gas is not dry/high humidity
environment
u
Use a dry air supply.
u
Use nitrogen.
Moisture trapped in the gas
lines
u
Remove moisture from lines
by purging the air flow
system with nitrogen for 5
minutes.
Mobile phase is contaminated
or contains non-volatile modi-
fiers
u
Use volatile modifiers in the
mobile phase.
Solvent contains non volatile
stabilizers
u
Use solvent with volatile
modifiers.
Dirty optics
u
Clean the optics.
Dirty drift tube
u
Clean drift tube.
Not correct installed exhaust
u
Install the exhaust correctly.
See Chapter 5.9 "Installing
the exhaust (ELSD only)",
page 28
Electronics - Preamp not
grounded properly
u
Verify that preamp
grounding cable is in place.
Nebulizer is partially blocked
u
Sonicate nebulizer to clean
or replace.
Silica or packing material
leaked out of cartridge
u
Replace the cartridge.
u
Flush the system.
No UV signal
UV light burned out
u
Replace the UV light.
Low UV signal
Dirty flow cell
u
Clean the flow cell.
8.7
Error messages
Error message
Possible cause
Solution
Instrument Alarm:
Solvent pump: Com-
munication to the
pump cannot be es-
tablished.
Serial communication dis-
turbed
u
Restart the instrument.
Instrument Alarm:
Solvent pump: Mo-
tor overloading.
-
u
Contact BUCHI Customer
Service.
Instrument Alarm:
Solvent pump: Mo-
tor regulation error.
Hardware error solvent pump
u
Contact BUCHI Customer
Service.
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