5 Maintenance
Corona Needle
Agilent 6475 Triple Quad LC/MS System User Guide 79
Replacing the corona needle
Perform this procedure when symptoms indicate poor corona needle
performance and cleaning the needle does not restore performance.
Do not hit tip of the corona needle. The tip can bend, which can decrease
system performance.
Tools needed:
• Clean powder-free nitrile gloves
• Corona needle
To replace the corona needle,
1 Put on clean powder-free nitrile gloves.
2 Pull the corona needle assembly out of the spray chamber.
3 Remove the needle collar from the corona needle shaft.
4 Remove the old corona needle from the collar.
5 Install a new corona needle, with its integral ferrule, in the collar.
6 Turn the collar onto the needle holder and tighten by hand.
Do not hit tip of the corona needle. The tip can bend, which can decrease
system performance.
7 Reinstall the corona needle assembly in the spray chamber.
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