Npd Bead Will Not Ignite - Agilent Technologies 7890 Series Troubleshooting Manual

NPD Bead Will Not Ignite

Agilent 7890 Series Troubleshooting
• Set the equilibration time to 0.0.
• Verify that the flow settings are correct and appropriate. See
Flows, temperatures, and bead
• 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
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.
• Inspect the jet to see if it is clogged. (See
Plugged NPD Jet.)
• Measure the actual detector flows. (See
Detector Flow.) If the hydrogen or makeup flows are zero or
much lower than the displayed flow, suspect a plugged jet.
ALS and Detector Symptoms
information.
Checking
Replace if necessary.
To Check for a
To Measure a
2
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