Waters Xevo TQD, Overview And Maintenance Manual

Page: 143 / 250

Cleaning the ion guide assembly
March 14, 2014, 715004387 Rev. B 143
To clean the differential aperture:
1. Use the glass-fiber pen to remove gross contamination from the
differential aperture by gentle abrasion.
2. Using 1:1 methanol/water from the wash bottle, flush the differential
aperture.
Rationale:
Doing so removes residual fibers displaced from the
glass-fiber pen.
3. Completely immerse the differential aperture in a glass vessel
containing 1:1 methanol/water.
Requirement:
If the differential aperture is still contaminated after
using the glass-fiber pen, use 45:45:10 methanol/water/formic acid.
4. Place the vessel in the ultrasonic bath for 30 minutes.
5. If you used formic acid in the cleaning solution, rinse the differential
aperture by immersing it in a glass vessel containing water and then
place the vessel in the ultrasonic bath for 20 minutes
.
6. Carefully remove the differential aperture from the vessel, and blow it
dry using inert, oil-free gas.
Warning:
To avoid personal contamination with biohazards or
toxic materials, and to avoid spreading contamination to
uncontaminated surfaces, wear clean, chemical-resistant,
powder-free gloves when handling the differential pumping
aperture, and throughout this procedure.
Notice:
To avoid recontaminating the differential aperture, wear
clean, chemical-resistant, powder-free gloves for the following
step.