Hardware manual

Maintenance 4
Agilent 7500 Series ICP-MS Hardware Manual 4-59
Maintaining the ShieldTorch
Check the torch, shield plate, and bonnet according to the following criteria
and perform maintenance as necessary.
Torch
• Cracked, chipped, or deformed by high temperatures
• When performing analysis requiring ultra- sensitivity (ppt)
• Deposits have formed in the central torch tube
Shield Bar
• Extensive corrosion or high temperature deformation
• Background ArO signal can not be lowered
Bonnet
• Fractured, cracked, or chipped
Locating Tools and Supplies
To maintain the shield torch, the following items are needed:
• Safety glasses and laboratory gloves
• 5% Nitric acid
• Pure water
• Methanol (HPLC grade)
• Cotton swabs (P/N: 9300- 2574)
NOTE
Pure water used for cleaning is indicated as water that has been generated using the
ion-exchange method and a membrane filter, and has an electrical resistance of at least
18 MΩ.