Hardware manual

Maintenance 4
Agilent 7500 Series ICP-MS Hardware Manual 4-71
To clean the cones, complete the following steps:
1 Check and clean the O- ring.
Remove the sampling cone O- ring, which is in the interface opening. If the
O- ring is cracked, replace it. If it is dirty or very dry, then wipe it with pure
water.
2 Clean with pure water (Step 1)
1 Dip a cotton swab in pure water and clean both sides of the cone. Hold
the cone by its outer perimeter. Carefully clean without using force as the
orifice is easily deformed.
2 Rinse with pure water.
3 Ultrasonic the cone in pure water for 2 to 3 minutes.
3 Clean with a 2% Citranox solution (Step 2)
1 Ultrasonic the cone in a 2% Citranox solution for 2 to 3 minutes.
2 Rinse with pure water.
4 Clean with a 2% nitric acid solution (Step 3)
1 Dip a cotton swab in a 2% nitric acid solution and clean both sides of the
cone. Hold the cone by its outer perimeter. Carefully clean without using
force as the orifice is easily deformed. Wear gloves when cleaning with
nitric acid.
2 Rinse with pure water.
5 Clean with alumina powder and Citranox (Step 4)
1 Use a mixture of alumina powder and pure water as a polishing solution.
Dip a cotton swab in the polishing solution and clean both sides of the
cone. Hold the cone by its outer perimeter. Carefully clean without using
force as the orifice is easily deformed.
2 Rinse with pure water.
3 Ultrasonic the cone in a 2% Citranox solution for 2 minutes.
4 Rinse in pure water.
5 Ultrasonic the cone in pure water for an additional 2 to 3 minutes.
CAUTION
Do not put grease on the O-ring of the sampling cone.
NOTE
The cones must not be stored in pure water for more than one night or they will become
damaged by corrosion.