82 Agilent 7890 Series Troubleshooting
3 Chromatographic Symptoms
• Verify that the bead is activated. Look through the vent hole
on the detector lid to see if the bead is glowing orange. If the
bead is not glowing, check the detector background signal.
Reduce the bead voltage to zero to establish a reference level,
and then look for a sudden sharp increase in output as the
bead voltage increases, which indicates that ignition
occurred. If 4 V are being supplied to the bead but it is not
igniting, the bead is probably burned out. Replace the bead.
• Replace the insulators/collector.
• Check for liquid phase contamination (polar phases).
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