Appi/Apci Source-Cleaning The Lamp Window - Waters Xevo TQD Operator's, Overview And Maintenance Manual

Caution:
push the bulb forward in the lamp drive assembly.
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.
The lamp glass is magnesium fluoride. Avoid touching it because
Tip:
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
To clean the lamp window:
1. Prepare the instrument for working on the source (see
To avoid breaking the bulb, do not use a screwdriver to
APPI/APCI source—cleaning the lamp window 4-107
page 4-7).