5 Maintenance
Cleaning the corona needle
123 Agilent Triple Quadrupole LC/MS System User Guide
Cleaning the corona needle
Schedule
When you observe decrease sensitivity, decreased signal stability and increase
corona voltage during APCI operation.
Equipment List
• Clean, powder-free nitrile gloves
• Clean lint-free cloth
• LC/MS-grade isopropanol
• 4000 grid abrasive paper
Steps
1 Before beginning any steps in this maintenance procedure, 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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