Chromatographic Symptoms 3
Agilent 7890 Series Troubleshooting 85
NPD Low Selectivity
(High hydrocarbon response relative to nitrogen or
phosphorus.)
• Verify that the hydrogen flow is correct (< 3 mL/min).
• Inspect the bead; it may be defective or expended.
• Verify correct bead voltage.
• Replace the collector and insulators.
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