Thermo Scientific Vanquish VF-D20, Руководство по эксплуатации, Страница: 162 / 182

8 • Troubleshooting
Page 162 Vanquish Charged Aerosol Detectors Operating Manual
Symptom Possible Cause Remedial Action
High backpressure Nebulizer
nozzle/capillary clogged
Poor solubility of analyte during nebulization/analyte build-up.
Check the backpressure of the nebulizer:
1. Remove the nebulizer from the detector (see
section 7.7,
page 128 ).
2. Set up a direct flow connection from the pump to the nebulizer.
Make sure no other module is connected in between.
3. Carefully flow liquid through the nebulizer capillary from the
pump. The backpressure of the nebulizer is typically below
10 bars. Liquid should exit the capillary in drops. If the
backpressure rises in the pump, then a blockage is present in the
nebulizer capillary. Contact Technical Support.
To avoid blockage in the nebulizer, always use the detector with
an appropriate mobile-phase composition to maintain solubility.
Negative peaks Wrong polarization of
the analog output Contact Technical Support.
Loss of response Change in parameters Check that the detector is turned on and the data acquisition is
on. Check the parameter settings.
Drain pump failed Check that the drain pump is turned on.
Gas flow turned off Check that the gas flow is turned on in the detector and the gas
supply.
Reduced gas flow •
Make sure that the gas is flowing into the detector.
• Check the nebulizer gas pressure and the gas supply pressure.
•
Check gas filter assembly. If necessary, replace the gas filter
assembly (see
section 7.8, page 131 ).
Gas leaking Check the gas connections and the gas inlet and exhaust tubes.
Remedy the gas leak and/or replace the gas tubes (see
section 7.5, page 125 ).
Inability to
autozero the
signal Autozero on a peak or
void signal The Autozero occurred on a relatively flat section of the
chromatogram.
Autozero on a very noisy
signal Reduce the noise or increase the current range.
Liquid in the gas
exhaust Flooding inside the
detector (pump flow
turned on while no gas
flow present) Flooding can occur if the detector is turned off while liquid is still
flowing into the detector.
See
section 8.3.3 Resolving Flooding In the Detector, page 160 .