5 Maintenance
Corona Needle
Agilent 6475 Triple Quad LC/MS System User Guide 78
Corona Needle
The following procedures describe periodic maintenance for the corona needle.
Cleaning the corona needle
Perform this procedure when you observe decreased sensitivity, decreased
signal stability, or increased corona voltage during APCI operation.
Tools needed:
• Clean powder-free nitrile gloves
• Clean lint-free cloth
• LC/MS-grade isopropanol
• 4000 grid abrasive paper
To clean the corona needle,
1 Put on clean powder-free nitrile gloves.
The needle and related parts can be very hot. Do not touch the needle or
related parts until they are cool.
2 Pull the corona needle assembly out of the spray chamber.
Do not bend or blunt the tip of the needle, it will decrease system performance.
Sharpening the needle is not needed.
3 Fold a piece of 4000 grit abrasive paper over the base of the needle.
4 Pull and twist the 4000 grit abrasive paper along the needle and off the tip of
the needle.
Do not hit tip of the corona needle. The tip can bend, which can decrease
system performance.
5 Starting at the base of the needle, wipe the needle with a clean lint-free cloth.
The cloth can be dry or dampened with LC/MS-grade isopropanol.
6 Reinstall the corona needle assembly in the spray chamber.
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