ALS and Detector Symptoms 2
Agilent 7890 Series Troubleshooting 37
NPD Bead Will Not Ignite
• Set the equilibration time to 0.0.
• Verify that the flow settings are correct and appropriate. See
Flows, temperatures, and bead information.
• If the process still fails, there could be a large leak in the
system. This causes measured flow rates to be different from
actual flow rates. Thoroughly leak check the whole system,
especially the detector column/adapter fitting. (See Checking
for Leaks.)
• Check for fault messages. Press [Service Mode], then go to
Diagnostics > Front detector or Back detector > Detector signal.
You can also read the bead voltage.
• Check the condition of the bead. Replace if necessary.
• Inspect the jet to see if it is clogged. (See To Check for a
Plugged NPD Jet.)
• Measure the actual detector flows. (See To Measure a
Detector Flow.) If the hydrogen or makeup flows are zero or
much lower than the displayed flow, suspect a plugged jet.
To Next Page
Loading...
Need help?
General
