Waters Xevo TQD, Overview And Maintenance Manual

Page: 189 / 250

APPI/APCI source—cleaning the lamp window
March 14, 2014, 715004387 Rev. B 189
5. Insert the length of 4-mm nylon tube through the back of the lamp drive
assembly, and push the bulb forward.
6. Remove the bulb from the lamp drive assembly.
7. Insert the new bulb into the lamp drive assembly.
Tip:
The lamp glass is magnesium fluoride. Avoid touching it because
dirt or other contaminants on the window significantly reduce UV
transmission.
8. Refit the lamp bulb access plug.
9. Return the combined 2.5-mm Allen wrench and cone extraction tool to
its storage location on the source adaptor housing.
10. Close the source enclosure.
11. Slide closed the instrument’s source interface door.
APPI/APCI source—cleaning the lamp window
The transmission of the high-energy photons responsible for APPI relies on
the cleanliness of the magnesium fluoride lamp window. Clean the window to
keep the surface clear of contamination and thus avoid reduced sensitivity.
Required materials
• Chemical-resistant, powder-free gloves
• Lint-free cloth
• Methanol or isopropyl alcohol
Notice:
To avoid breaking the bulb, do not use a screwdriver to
push the bulb forward in the lamp drive assembly.
Warning:
To avoid burn injuries, take great care while working
with the probe, source, and lamp bulb; these components can be
hot.
Warning:
To avoid eye injury from UV radiation, ensure that the
APPI lamp is extinguished before carrying out this procedure.