Cleaning The Corona Needle - Agilent Technologies Revident LC/Q-TOF System User Manual

5 Maintenance

Cleaning the corona needle

Cleaning the corona needle

Schedule
When you observe decreased sensitivity, decreased signal stability and increased
corona voltage during APCI operation.
Equipment List
Steps
1 Before beginning any steps in this maintenance procedure, put on clean,
The needle and related parts can be very hot. Do not touch the needle or
WAR N IN G
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.
C AU T I O N
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
Do not hit the tip of the corona needle. The tip can bend, which can decrease
C AU T I O N
system performance.
5 Starting at the base of the needle, wipe the needle with a clean lint-free cloth.
6 Reinstall the corona needle assembly in the spray chamber.
Agilent Revident LC/Q-TOF System User Guide
• Clean, powder-free nitrile gloves
• Clean lint-free cloth
• LC/MS-grade isopropanol
• 4000 grid abrasive paper
powder-free nitrile gloves.
the needle.
The cloth can be dry or dampened with LC/MS-grade isopropanol.
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