Agilent Technologies 7890A Troubleshooting Manual page 51

NPD Response Low
Troubleshooting
• Perform complete inlet maintenance: Replace all
consumable parts and bake out the inlet.
• Perform column maintenance: Bake out contaminants as
needed.
• A large concentration of solvent has extinguished the
hydrogen/air plasma. Increase the bead voltage.
• Measure the actual gas flow at the detector. (See "To
Measure a Detector Flow".)
• Check for a partially plugged jet.
• Verify that the bead is activated. Look through the vent
hole on the detector lid to see if the bead is glowing
orange. Replace the insulators/collector.
Chromatographic Symptoms
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