Waters Xevo G2 QTof, Руководство оператора, обзор и техническое обслуживание, Страница: 110 / 248

5-34 Maintenance Procedures
Cleaning the sample cone and cone gas nozzle
Required materials
• Chemical-resistant, powder-free gloves.
• Appropriately sized glass vessels in which to completely immerse
components when cleaning. Use only glassware not previously cleaned
with surfactants.
• HPLC-grade (or better) methanol.
• HPLC-grade (or better) water.
• Formic acid.
• Ultrasonic bath.
• Source of oil-free, inert gas (nitrogen or argon) for drying (air-drying
optional).
• Wash bottle containing HPLC-grade (or better) 1:1 methanol/water.
• Large beaker.
To clean the sample cone and cone gas nozzle:
1. If the sample cone contains debris, place a drop of formic acid on its
orifice.
2. Immerse the sample cone, cone gas nozzle, and cone gas nozzle handle in
separate glass vessels containing 1:1 methanol/water.
Tip:
If the components are obviously contaminated, use 45:45:10
methanol/water/formic acid.
3. Place the vessels in the ultrasonic bath for 30 minutes.
Warning:
The sample cone and cone gas nozzle can be
contaminated with biohazardous and/or toxic materials. Always
wear chemical-resistant, powder-free gloves while performing this
procedure.
Warning:
Formic acid is extremely corrosive and toxic. Work with
extreme care. Use a fume hood and suitable protective equipment.
Caution:
The sample cone is fragile. Never place it on its tip; always
place it on its flanged base.