Buchi Alltech 3300 ELSD - 6.4 Troubleshooting Charts

BÜCHI Labortechnik AG
www.buchi.com
26
6.4 TROUBLESHOOTING CHARTS
Consult the following charts to assist in troubleshooting your system:
TROUBLESHOOTING
PROBLEM
CAUSE
SOLUTION
Baseline drift
Detector has not fully equilibrated. Wait for detector to fully equilibrate. Refer to
Section 4.5, Start-Up Sequence, for
equilibration procedure.
Baseline noise
Follow the procedure in
Section 6.3
,
Diagnosing Baseline Noise, to
determine the source of the problem
and possible solutions.
Spiking
Drift tube temperature and/or gas flow
rate set too low.
Gas source contaminated or low
purity.
Mobile phase contaminated or made
of low quality material.
Nebulizer, drift tube, and/or optical cell
dirty.
Improper nebulization.
Re-optimize the drift tube temperature and gas
flow rate following the optimization procedure
in Section 4.5.
Use clean, dry, inert gas, usually 99.9% pure
nitrogen.
Replace with fresh, filtered, higher-quality
mobile phase.
Refer to Sections 5.1 – 5.4 for cleaning
procedures.
Nebulizer may be partially obstructed. Refer to
Section 5
.2
for nebulizer cleaning procedure.
Drift tube temperature not
reaching set point
Thermal fuse(s) may be blown.
Drift tube heater, sensor, or other
electronics error.
Contact your local BUCHI Customer Service office
which can be found on www.buchi.com.
Optics block tem
perature not
reaching set point
Thermal fuse may be blown.
Optics block heater, sensor, or other
electronics error.
Contact your local BUCHI Customer Service office
which can be found on www.buchi.com.
No gas flow
Gas source valve is closed.
Source gas pressure is too low.
Gas source may be low or empty.
Open gas valve.
Adjust source pressure to 65-80psig.
Replace gas source.
No power
Blown fuse.
Replace fuse. Refer to
Section 5.5
, Fuse
Replacement, for details.