Thermo Scientific VH-D20 Operating Manual page 157

Troubleshooting Parameters
Firmware Failure
Charged Aerosol Detectors (VH-D20, VF-D20)
Operating Manual
The following parameters provide helpful information for
troubleshooting if a problem occurs in the charged aerosol detector:
Parameters
Gas flow ratio
Charger voltage
Charger current
If a firmware failure occurred during operation of the module, an
exception log has been created about the processes during the firmware
failure. The firmware sends the exception log to the Instrument Audit
Trail when the module is connected in the chromatography data system.
In this case, observe the following:
• Send the Instrument Audit Trail as .cmbx file to the Technical
Support before you clear the log.
• To clear the exception log and continue operation of the module,
perform the command ExceptionLogClear.
For more information, refer to the Chromeleon Help.
Description
Displays the ratio of the nebulizer gas pressure to the
charging gas pressure.
As a standard, the Gas Flow Ratio is Normal.
For troubleshooting information on the gas flow ratio, see
Additional Device Operating Issues
Displays the voltage applied to the corona needle to
charge the (secondary) ion gas stream. Typical value
ranges from 2.0 - 3.0 kV.
If the value is outside of this range, contact Technical
Support.
Displays the current that is required to charge the
(secondary) ion gas stream. Typical value ranges from
0.98 - 1.02 µA.
If the value is subject to fluctuations or outside of this
range, contact Technical Support.
8 • Troubleshooting
(} page 166).
Page 157