Hardware manual

4-40 Agilent 7500 Series ICP-MS Hardware Manual
4Maintenance
Figure 53 MicroMist Nebulizer and End Cap
To clean a clogged nebulizer, complete the following steps:
1 Disconnect the nebulizer from the end cap.
Refer to “Disconnecting the Concentric Nebulizer and the End Cap”.
2 Wash the nebulizer by pumping pure water through the nebulizer in the
opposite direction.
Reverse the sample tubing on the peripump and place the nebulizer tip in
pure water. Allow the peripump to draw water through the tip and out the
back of the nebulizer for a few minutes. Take care not to touch the tip of the
nebulizer.
3 Check the O- rings
Check the O- rings on the sample and carrier gas connectors and replace
them if they are cracked or too loose to seal properly. Wash the O- rings by
immersing them in pure water and dry them gently with a clean laboratory
tissue. Replace any damaged O- rings.
If necessary, also replace the end cap O- rings, which are located inside the
nebulizer end cap, and the ferrules, which are located in the connector
between the nebulizer and carrier gas tube.
Tubing for Make-up Gas
End Cap
O-ring
Tubing for Carrier Gas
Nebulizer
Teflon Tubing
for Sample
NOTE
If the gas tubing and sample introduction around the nebulizer leaky even a small amount, it
causes a sharp signal fluctuation. To prevent leaks, be especially careful not to damage the
O-ring.