98 Agilent 6500 Series Q-TOF LC/MS Maintenance Guide
2Maintenance
To clean the corona needle
To clean the corona needle
When required When you observe decrease sensitivity, decreased signal stability, and increase
corona voltage during APCI operation.
Tools required • Abrasive paper, 4000 grit (p/n 8660-0827)
• Cloths, clean, lint-free (p/n 05980-60051)
• Gloves, clean
• Isopropanol, reagent grade or better
Parts required None
1 Pull the corona needle assembly out of the spray chamber.
Figure 42 Dirty APCI corona needle.
2 Fold a piece of abrasive paper over the base of the needle.
3 Pull and twist the abrasive paper along the needle and off the tip of the
needle.
The needle and related parts get very hot during operation. Make sure they have
cooled before proceeding.
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