Additional Device Operating Issues - Thermo Scientific VH-D20 Operating Manual

8 • Troubleshooting
8.3.4

Additional Device Operating Issues

Baseline noise and/or poor precision
Page 166
2. If the message has disappeared, turn the detector gas flow off and
on. Check the following indicators:
Situation
If the status indicators are no
longer red and the message in the
Instrument Audit Trail no longer
appears
If the status indicators are still red
and the message in the Instrument
Audit Trail still appears
This section provides additional issues that may arise during operation of
the device. Locate the table for the type of symptom you have, find the
possible cause, and use the description of the solution to help you solve
your problem quickly.
Also check the Instrument Audit Trail for a related message if an
operating problem occurs. The message may provide additional
information.
Note that this section provides information on symptoms and causes
directly related to the device. For information about troubleshooting for
the Vanquish system, refer to the Vanquish System Operating Manual.
TIP If you are unable to resolve a problem following the instructions
given here or if you experience problems that are not covered in this
section, contact Thermo Fisher Scientific Technical Support for
assistance.
Possible Cause
Change in background
current
Unstable gas regulator
pressure
Unstable evaporation
temperature
Steps
The excess liquid build-up is removed. Resume
operation.
Write down the code and wording of the
message, and contact Thermo Fisher Scientific
Technical Support for assistance.
Remedial Action
If the Background_Current signal channel is changing, this can
indicate a contamination in the flow path of the system. Make
sure that all components in the liquid flow path are free from
contamination.
If the GasReg_Pressure signal channel shows an instability in the
nebulizer gas pressure, this can lead to baseline noise and/or poor
precision. Check that the gas supply pressure is stable. If the
instability remains, contact Technical Support.
If the Evap_Tube_Temp signal channel is unstable, this can lead to
higher baseline noise and/or poor precision.
Contact Technical Support.
Charged Aerosol Detectors (VH-D20, VF-D20)
Operating Manual