Hardware manual

4-42 Agilent 7500 Series ICP-MS Hardware Manual
4Maintenance
If there is a memory, clear it by completing the following steps:
1 Disconnect the nebulizer from the end cap. Remove the O- rings.
Refer to “Disconnecting the Concentric Nebulizer and the End Cap”.
Disconnect the sample tube and the connector as well.
2 Soak the nebulizer in 5% Nitric Acid both overnight.
Wear safety glasses and gloves when working with acid.
3 Check the O- ring.
Check the O- ring used as the connector between the sample line and the
carrier gas. Replace O- ring if it has damage or is too loose to fit properly.
Soak the O- ring in pure water and gently dry with a clean laboratory tissue.
If necessary, replace the ferrule used for the O- ring and the connector
inside the end cap.
Disconnecting the Concentric Nebulizer and the End Cap
1 Disconnect the nebulizer.
Loosen the nebulizer holder nut and gently pull the nebulizer out of the end
cap while gently twisting it. Take care not to touch the nebulizer tip against
the inside wall of end cap. Wash the two nebulizer O- rings by removing
them from the end cap and cleaning them with pure water. Replace if
needed.
2 Remove and check the O- ring in the end cap that fits over the spray
chamber. To clean the end cap, take out the O- ring with tweezers from
the hole where the connector for nebulizer fits in.
NOTE
An ultrasonic wash must NOT be used to clean the spray part of concentric nebulizer.
If the gas tubing and sample introduction around the nebulizer leak even a small amount, it
causes a sharp signal fluctuation. To prevent leaks, be especially careful not to damage the
O-ring.
NOTE
Be careful not to loosen the small O-ring in the connector for the sample tube.